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Envelope Tracking
Envelope Tracking Power Supply
Tracking System
Transmitter
Power Management
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Covariance
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Envelope Tracking patents



      
           
This page is updated frequently with new Envelope Tracking-related patent applications. Subscribe to the Envelope Tracking RSS feed to automatically get the update: related Envelope RSS feeds. RSS updates for this page: Envelope Tracking RSS RSS


Envelope tracking power amplifier system with delay calibration

Method and apparatus for a multi-standard, multi-mode, dynamic, dc-dc converter for radio frequency power amplifiers

2g support for 2g and 3g/4g envelope tracking modulator

Date/App# patent app List of recent Envelope Tracking-related patents
08/28/14
20140241462
 Circuit and method for envelope tracking and envelope-tracking transmitter for radio-frequency transmission patent thumbnailnew patent Circuit and method for envelope tracking and envelope-tracking transmitter for radio-frequency transmission
A method of envelope tracking and an envelope tracking (et) circuit. One embodiment of the (et) circuit is for radio frequency (rf) transmission and includes: (1) an amplitude calculator configured to generate an amplitude signal that approximates the amplitude of an input signal, (2) a peak detector configured to take samples of the amplitude signal within a time window and produce an envelope signal that represents an amplitude peak among the samples, and (3) a signal conditioner configured to condition the envelope signal for driving a power supply input stage of a power amplifier operable to amplify and transmit an rf signal based on the input signal..
08/21/14
20140235185
 Envelope tracking power amplifier system with delay calibration patent thumbnailEnvelope tracking power amplifier system with delay calibration
An envelope tracking power amplifier system time-aligns a supply voltage to an input signal to a power amplifier. The power supply operates in a static mode for low amplitude input signals and operates in a dynamic mode for high amplitude input signals.
08/21/14
20140232458
 Method and apparatus for a multi-standard, multi-mode, dynamic, dc-dc converter for radio frequency power amplifiers patent thumbnailMethod and apparatus for a multi-standard, multi-mode, dynamic, dc-dc converter for radio frequency power amplifiers
A multi-mode, dynamic, dc-dc converter supplies a dynamically varying voltage, as required, from a battery to an rf power amplifier (pa). In envelope tracking mode, a fast dc-dc converter generates a dynamic voltage that varies based on the amplitude envelope of an rf signal, and regulates the voltage at the pa.
08/07/14
20140218109
 2g support for 2g and 3g/4g envelope tracking modulator patent thumbnail2g support for 2g and 3g/4g envelope tracking modulator
There is provided an amplification stage including an envelope tracking modulated supply for tracking a reference signal, comprising a low frequency path for tracking low frequency variations in the reference signal and for providing a first output voltage, and a high frequency path for tracking high frequency variations in the reference signal and for providing a second output voltage, and a combiner for combining the first and second output voltages to provide a third output voltage, the amplification stage further comprising a first amplifier arranged to receive the first output voltage as a supply voltage, and a second amplifier arranged to receive the third output voltage as a supply voltage, wherein the first and second amplifiers are enabled in different modes of operation.. .
07/31/14
20140213204
 Apparatus and methods for envelope tracking in radio frequency systems patent thumbnailApparatus and methods for envelope tracking in radio frequency systems
Apparatus and methods for envelope tracking are disclosed. In one embodiment, a power amplifier system including a power amplifier and an envelope tracker is provided.
07/31/14
20140213196
 Recalibration of envelope tracking transfer function during active transmission patent thumbnailRecalibration of envelope tracking transfer function during active transmission
An envelope tracking system and a method for adjusting a nonlinear transfer function of an envelope tracking power supply for a power amplifier are provided. An output signal of the power amplifier is provided to a feedback receiver for determining an actual performance of the envelope tracking power amplifier.
07/31/14
20140210559
 Dynamic headroom for envelope tracking patent thumbnailDynamic headroom for envelope tracking
Techniques for dynamically generating a headroom voltage for an envelope tracking system. In an aspect, an initial headroom voltage is updated when a signal from a power amplifier (pa) indicates that the pa headroom is insufficient.
07/24/14
20140203869
 Communications based adjustments of an offset capacitive voltage patent thumbnailCommunications based adjustments of an offset capacitive voltage
A parallel amplifier and an offset capacitance voltage control loop are disclosed. The parallel amplifier has a parallel amplifier output, which is coupled to an envelope tracking power supply output via an offset capacitive element.
07/24/14
20140203868
 Communications based adjustments of a parallel amplifier power supply patent thumbnailCommunications based adjustments of a parallel amplifier power supply
A parallel amplifier and a parallel amplifier power supply are disclosed. The parallel amplifier power supply provides a parallel amplifier power supply signal, which is adjustable on a communications slot-to-communications slot basis.
07/17/14
20140199949
 Method for improving tx gain in envelope tracking systems patent thumbnailMethod for improving tx gain in envelope tracking systems
A method and system enhances the gain of a propagation path of a radio frequency (rf) signal while utilizing an envelope tracking (et) mechanism to provide power to a power amplifier within the propagation path. An envelope tracking (et) controller detects using the et mechanism an rf envelope of the rf signal being propagated towards the power amplifier.
07/17/14
20140198879
Transmitter
Embodiments provide methods, apparatus and computer software for use in calibrating a transmitter in operative association with a variable supply voltage. A phase distortion of the power amplifier is determined for a given instantaneous power.
07/03/14
20140187182
Method and apparatus for calibrating an envelope tracking system
A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (rf) transmitter of a wireless communication unit is described. The method comprising, within at least one signal processing module of the wireless communication unit, applying a training signal comprising an envelope that varies with time to an input of the rf transmitter, receiving at least an indication of instantaneous output signal values for the power amplifier module in response to the training signal, calculating instantaneous gain values based at least partly on the received output power values, and adjusting a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a power amplifier module gain, for example that is monotonically increasing as a function of power amplifier output power..
07/03/14
20140184337
Control systems and methods for power amplifiers operating in envelope tracking mode
Control systems and methods for power amplifiers operating in envelope tracking mode are presented. A set of corresponding functions and modules are described and various possible system configurations using such functions and modules are presented..
07/03/14
20140184336
Amplifier dynamic bias adjustment for envelope tracking
An envelope tracking amplifier having stacked transistors is presented. The envelope tracking amplifier uses dynamic bias voltages at one or more gates of the stacked transistors in addition to a dynamic bias voltage at a drain of a transistor..
07/03/14
20140184335
Amplifiers operating in envelope tracking mode or non-envelope tracking mode
Various envelope tracking amplifiers are presented that can be switched between an et (envelope tracking) mode and a non-et mode. Switches and/or tunable components are utilized in constructing the envelope tracking amplifiers that can be switched between the et mode and the non-et mode..
06/19/14
20140169427
Method and apparatus for calibrating an envelope tracking system
A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (rf) transmitter module. The method includes deriving a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a constant power amplifier module gain based on a gain compression factor, setting an envelope tracking path of the transmitter module into an envelope tracking mode in which mapping between the instantaneous envelope of the waveform signal and the power amplifier module supply voltage is performed using the derived mapping function, applying a training signal comprising an envelope that varies with time to the rf transmitter module, measuring a battery current, modifying the gain compression factor based on the measured battery current, and re-deriving the mapping function based on the modified gain compression factor..
06/19/14
20140169039
High bandwidth, high efficiency dc-dc multilevel converter topology
A multilevel dc-dc converter includes a voltage source that provides a voltage vout1 to at least one charge converter circuit and an output filter capacitor having an associated output voltage vout2. The at least one charge converter circuit includes a transformer having at least one primary winding and at least two secondary windings, a primary and secondary circuit each having at least two switching elements, and a control unit which receives a control signal, such as but not limited to an envelope tracking signal, which represents a desired output voltage.
06/19/14
20140167843
Method and apparatus for calibrating an envelope tracking system
A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (rf) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit, determining combinations of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power, obtaining battery current indications for the determined combinations of the power amplifier supply voltage and power amplifier input power, selecting a combination of the power amplifier supply voltage and power amplifier input power that provide a power amplifier output power equal to a target output power based at least partly on the obtained battery current indications therefore, and calibrating the envelope tracking system using the selected combination of the power amplifier supply voltage and power amplifier input power..
06/05/14
20140155128
Unequal amplifier gain compression via shaping table
A communication device, such as a smart phone, includes an envelope tracking power supply that provides a voltage supply signal for a power amplifier. The envelope tracking signal input to the envelope tracking power supply arises from application of a shaping table on a desired transmit signal.
06/05/14
20140155127
Envelope tracker path adaptation for power saving
In response to changing power output requirements of a ue, an envelope tracking (et) path of a transmission chain changes power modes. When the ue output power is below a threshold, the et path may switch an et power supply to a low power mode.
06/05/14
20140155117
Shaping table reconfiguration at communication event boundaries
A communication device, such as a smart phone, receives a power specification message from a network controller. The power specification message specifies an output power applicable for a particular communication subframe or symbol within the subframe.
06/05/14
20140155116
Dynamic operating bandwidth configuration for an envelope tracker
A communication device, such as a smart phone, receives operational parameters from a network controller. The operational parameters may include, as examples, bandwidth allocation, center frequency, and receive/transmit band assignments.
06/05/14
20140155002
Envelope tracking signal bandwidth control
An envelope tracking circuit for a transmit and receive path for a telecommunications device includes a filter to reduce the bandwidth of the transmit signal. The envelope of the filtered signal having the lower bandwidth is used to dynamically modulates the power amplifier voltage supply signal.
06/05/14
20140154998
Transmit adaptation responsive to signal transformation
A communication device, such as a smart phone, monitors signal transformations and adapts its transmit chain in response. The transformations may include the effect of load angle and load magnitude on a signal prepared for transmission through an antenna.
06/05/14
20140153461
Envelope tracker driven transmit beamforming
A method and telecommunication device in which the telecommunication device is provided with multiple antennas and power amplifiers to provide a beamformed transmit stage. An envelope tracking circuit helps achieve significant power savings in the power amplifier and can be used to provide the power supply for the multiple power amplifiers.
05/08/14
20140125135
Technology for extending a radio frequency (rf) bandwidth of an envelope tracking (et) power amplifier (pa)
An envelope tracking power supply (et ps) transmission line switch can be operable between an et ps and a radio frequency (rf) power amplifier (pa). The et ps transmission line switch assembly can include a quarter wavelength (¼λ) transmission line configured for high impedance at a specified low rf and a switch coupled to a specified point on the quarter wavelength transmission line to generate a high frequency quarter wavelength transmission line when the switch is toggled.
04/24/14
20140111362
Integrated circuit, wireless communication unit and method for a differential interface for an envelope tracking signal
A signal processing circuit has a first circuit, a digital-to-analog converter (dac) and a second circuit. The first circuit receives a digital input signal with a non-zero direct current (dc) component, and subtracts at least a portion of the dc) component of the received digital input signal from the received digital input signal.
04/24/14
20140111279
Envelope tracking distributed amplifier
A system and method amplify a waveform in a wireless network. An envelope of a waveform is detected to form an envelope waveform.
04/24/14
20140111276
Boost converter control for envelope tracking
Techniques for controlling boost converter operation in an envelope tracking (et) system. In an aspect, an enable generation block is provided to generate an enable signal for a boost converter, wherein the enable signal is turned on in response to detecting that a sum of a first headroom voltage and an enable peak of a tracking supply voltage is greater than an amplifier supply voltage of the et system.
04/24/14
20140111178
Transitioning from envelope tracking to average power tracking
An envelope tracking power supply and an offset capacitive element are disclosed. The offset capacitive element is coupled between a switching output and an analog output of the envelope tracking power supply, which operates in one of an envelope tracking mode, a transition mode, and an average power tracking mode.
04/17/14
20140103995
Control circuit and method for controlling an operation of a power amplifier
A control circuit and a method for controlling an operation of a power amplifier core are provided. The power amplifier core is switchable between an envelope tracking operation mode and a non-envelope tracking operation mode.
04/10/14
20140099906
Reducing effects of rf mixer-based artifact using pre-distortion of an envelope power supply signal
A radio frequency (rf) power amplifier (pa) and an envelope tracking power supply are disclosed. The rf pa receives and amplifies an rf input signal to provide an rf transmit signal using an envelope power supply signal, which at least partially envelope tracks the rf transmit signal, such that the rf input signal has an rf mixer-based artifact.
03/27/14
20140085008
Envelope tracking signal generator incorporating trim cell
A novel and useful radio frequency (rf) front end module (fem) circuit that provides high linearity and power efficiency and meets the requirements of modern wireless communication standards such as 802.11 wlan, 3g and 4g cellular standards, bluetooth, zigbee, etc. The configuration of the fem circuit permits the use of common, relatively low cost semiconductor fabrication techniques such as standard cmos processes.
03/27/14
20140084998
Apparatus and methods for capacitive load reduction
Apparatus and methods for capacitive load reduction are disclosed. In one embodiment, a power amplifier system includes a plurality of power amplifiers and an envelope tracking module for generating a supply voltage for the power amplifiers.
03/13/14
20140073273
Method and apparatus for calibrating an envelope tracking system
A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (rf) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit: applying training signal having time-variant envelope to input of the rf transmitter module; receiving indication of instantaneous output signal value(s) for the power amplifier module in response to the training signal; and adjusting timing alignment between envelope tracking path of the envelope tracking system and transmit path of the rf transmitter module to align envelope tracking power amplifier module supply voltage to instantaneous envelope(s) of a waveform signal to be amplified by the power amplifier module, based at least partly on the received indication of the instantaneous output signal value(s) for the power amplifier module in response to the training signal..
03/13/14
20140073272
Method and apparatus for calibrating an envelope tracking system
A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (rf) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit, applying a training signal having an envelope that varies with time to an input of the rf transmitter module, receiving at least an indication of instantaneous output signal values for the power amplifier module in response to the training signal, calculating instantaneous gain values based at least partly on the received output power values, and adjusting a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a constant power amplifier module gain..
03/06/14
20140062590
Multiple power supply input parallel amplifier based envelope tracking
A switch mode power supply converter and a parallel amplifier are disclosed. The switch mode power supply converter is coupled to a modulated power supply output and the parallel amplifier has a parallel amplifier output coupled to the modulated power supply output.
02/27/14
20140057684
Power loop control based envelope tracking
Configuration-feedback circuitry and transceiver circuitry are disclosed. The configuration-feedback circuitry regulates an output power from a radio frequency power amplifier based on a difference between a target output power from the radio frequency power amplifier and a measured output power from the radio frequency power amplifier.
02/27/14
20140055197
Power management architecture for modulated and constant supply operation
A power management system, which includes a parallel amplifier circuit and a switch mode power supply converter, is disclosed. The switch mode power supply converter cooperatively operates with the parallel amplifier circuit to form the power management system.
01/30/14
20140028392
Pre-distortion in rf path in combination with shaping table in envelope path for envelope tracking amplifier
There is disclosed a method of controlling an envelope tracking amplification stage comprising an envelope modulated power supply, the method comprising: determining a shaping function to be applied to an envelope signal for controlling the envelope modulated power supply in dependence on a system linearity objective in a region of operation of the amplifier in which the output power of the amplifier is dependent upon the supply voltage; and determining a pre-distortion function to be applied to an input signal to be amplified in dependence on a further linearity objective of the system, in a region of operation of the amplifier in which the output of the amplifier is dependent upon the input power to the amplifier.. .
01/30/14
20140028370
Crest factor reduction applied to shaping table to increase power amplifier efficiency of envelope tracking amplifier
There is disclosed a method of controlling an input to an envelope modulated power supply of an envelope tracking amplification stage, comprising: generating an envelope signal representing the envelope of a signal to be amplified; applying a shaping function to the envelope signal to generate a shaped envelope signal, including: clipping the shaped envelope signal at high input envelope values; and providing the shaped envelope signal as an input signal to the envelope modulated power supply.. .
01/30/14
20140028368
Programmable rf notch filter for envelope tracking
A parallel amplifier, a switching supply, and a radio frequency (rf) notch filter are disclosed. The parallel amplifier has a parallel amplifier output, such that the switching supply is coupled to the parallel amplifier output.
01/16/14
20140018133
Rf communications
An envelope tracking amplifier for a transmitter has a voltage mapping linearly related to the square of the amplitude of the baseband signal.. .
01/02/14
20140002053
Power supply modulation method and power supply modulator
A modulation method and modulator for an envelope tracking power supply. An output of a multi-level switching regulator (202) in the envelope tracking power supply modulator is in parallel connection with an output of a linear regulator (201) via an inductor (203) and supplies power to a load.
11/21/13
20130307615
Dc-dc converter for envelope tracking
Embodiments provide a dc-dc converter (dc-dc=direct current to direct current) for envelope tracking. The dc-dc converter includes a digital control stage and a driving stage.
10/17/13
20130271225
Power module for envelope tracking
A power module for envelope tracking includes a linear amplifier and a dc-to-dc (direct current to direct current) converter. The linear amplifier has a positive input terminal for receiving a first control signal, a negative input terminal, and an output terminal for outputting a first adaptive supply voltage, wherein the output terminal is fed back to the negative input terminal.
09/12/13
20130238913
Apparatus and method for power management
An apparatus for power management for use in a mobile device includes an rf (radio frequency) circuit, a power amplifier, a processor, and a dc to dc (direct current to direct current) converter. The processor is configured to generate a baseband signal.
09/12/13
20130235949
Apparatus and method for time alignment of an envelope tracking power amplifier
An apparatus and method for a time alignment (ta) operation used by an envelope tracking (et) radio frequency (rf) power amplifier (pa) that amplifies rf signals are provided. The et rf pa has an input signal including complex, reference, and feedback signals.
09/12/13
20130234793
Split vcc and common vcc power management architecture for envelope tracking
An envelope tracking power supply and transmitter control circuitry are disclosed. The transmitter control circuitry receives a first envelope power supply control signal and a second envelope power supply control signal.
09/05/13
20130231069
Envelope tracking power amplifier system with delay calibration
An envelope tracking power amplifier system time-aligns a supply voltage to an input signal to a power amplifier. The power supply operates in a static mode for low amplitude input signals and operates in a dynamic mode for high amplitude input signals.
09/05/13
20130229228
Noise optimized envelope tracking system for power amplifiers
A radio frequency (rf) power amplifier system that comprises a power amplifier configured to amplify an rf input signal to generate an rf output signal. The power amplifier has a gain that is controlled by a supply voltage to the power amplifier.
08/22/13
20130217345
Apparatus and methods for envelope tracking systems
Apparatus and methods for envelope tracking systems are disclosed herein. In certain implementations, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided.
08/15/13
20130207731
Apparatus and methods for envelope tracking
Apparatus and methods for envelope tracking are disclosed herein. In certain implementations, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided.
08/15/13
20130207721
Envelope tracking amplifier
An envelope tracking power amplifier uses signal cancellation techniques to provide isolation between rf signals and envelope signals, without the use of filters. In this manner, the envelope tracking power amplifiers are capable of operating with envelope signals that are at or near the frequency of the corresponding rf signals.
08/08/13
20130200865
Switch mode power supply for envelope tracking
There is disclosed an envelope tracked power supply comprising a high bandwidth, low delay closed loop switch mode power supply stage comprising: a pulse width modulator for generating a width modulated pulse in dependence on an input signal and an output voltage of the switch mode power supply stage; a wideband transformer, having a winding of a first side connected to receive the modulated pulse, and a winding of a second side; and an output stage connected to the winding of the second side of the transformer, and for generating the output voltage in dependence on the modulated pulse induced in the winding of the second side.. .
08/01/13
20130194979
Optimal switching frequency for envelope tracking power supply
A radio frequency (rf) communications system, which includes an rf power amplifier (pa) and an envelope tracking power supply, is disclosed. The rf communications system processes rf signals associated with at least a first rf communications band, which has a first bandwidth.
07/18/13
20130183916
Modified switching ripple for envelope tracking system
Radio frequency (rf) transmitter circuitry, which includes an rf power amplifier (pa) and an envelope tracking power supply, is disclosed. The rf pa receives and amplifies an rf input signal to provide an rf transmit signal using an envelope power supply signal.
07/18/13
20130181774
Envelope tracking with variable compression
Radio frequency (rf) transmitter circuitry, which includes an envelope tracking power supply and an rf power amplifier (pa), is disclosed. The rf pa operates in either a first operating mode or a second operating mode, such that selection of the operating mode is based on compression tolerance criteria.


Popular terms: [SEARCH]

Envelope Tracking topics: Envelope Tracking, Envelope Tracking Power Supply, Tracking System, Transmitter, Power Management, Feedback Signal, Covariance, Transmitter Circuit, Calibration, Low Frequency, Integrated Circuit, Amplification, Communications, Rf Communication, Reference Voltage

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This listing is a sample listing of patent applications related to Envelope Tracking for is only meant as a recent sample of applications filed, not a comprehensive history. There may be associated servicemarks and trademarks related to these patents. Please check with patent attorney if you need further assistance or plan to use for business purposes. This patent data is also published to the public by the USPTO and available for free on their website. Note that there may be alternative spellings for Envelope Tracking with additional patents listed. Browse our RSS directory or Search for other possible listings.
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