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Voltage Comparator

Voltage Comparator-related patent applications - as published by the U.S. Patent and Trademark Office (USPTO).


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Voltage detection circuit
Freebird Semiconductor Corporation
June 15, 2017 - N°20170170821

A detection circuit includes an under-voltage circuit. The under-voltage circuit includes a first gan high electron mobility transistor (hemt) configured to operate as both a voltage comparator and a voltage reference. The detection circuit can also include an over-voltage detection circuit. The over-voltage detection circuit includes a second gan hemt that is also configured to operate as both a voltage ...
Method and system to prevent voltage sagging in a redundant power supply configuration
Cisco Technology, Inc.
June 08, 2017 - N°20170163027

Aspects of the subject technology relate to a system and method for preventing voltage sagging using an oring-fet in a redundant power supply configuration. Each redundant power supply includes an oring-fet and a voltage comparator. The voltage comparator receives and compares an input voltage and an output voltage of the oring-fet during power up. In the event input voltage is ...
Digitally calibrated successive approximation register analog-to-digital converter
Avnera Corporation
May 04, 2017 - N°20170126240

A circuit can include a voltage comparator vd having a first input, a second input, and an output; a first plurality of capacitors cp[0:n] that each have a top plate and a bottom plate, wherein each top plate is electrically coupled with the first input of the voltage comparator vd, wherein each top plate is also switchably electrically coupled ...
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High speed low current voltage comparator
Silicon Laboratories Inc.
March 30, 2017 - N°20170093399

In one embodiment, a voltage comparator circuit includes a first comparator circuit to compare a first voltage and a second voltage and a second comparator circuit to compare the first voltage and the second voltage. The voltage comparator circuit may include charge storage circuitry and positive feedback circuitry. Such circuitry may boost current within the first and second comparator circuits ...
Memory driving circuit
Being Advanced Memory Taiwan Limited
March 16, 2017 - N°20170076796

A memory driving circuit is disclosed herein. The memory driving circuit includes a programmable current source, a reference voltage generation unit and a voltage comparator unit, the programmable current source generates a second current according to a first current. The second current flows into a memory cell, and produces a device voltage at the input of the memory cell. The ...
Method and apparatus for controlling power at base station in a communication system
Samsung Electronics Co., Ltd.
March 09, 2017 - N°20170070954

A method and apparatus for controlling power of a base station (bs) in a wireless communication system are provided, in which a voltage comparator compares an operation voltage of a power control target of the bs with a minimum required voltage for the power control target, and a controller decreases the operation voltage of the power control target by a ...
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Rectifier circuit, and contactless power supply device
Panasonic Intellectual Property Management Co., Ltd.
February 09, 2017 - N°20170040842

The rectifier circuit includes: three terminals a, k, vr; voltage comparator including a positive input terminal, a negative input terminal, and a comparative output terminal; current switching unit including source terminal, drain terminal, and control terminal; first switching unit that conducts or cuts off between source terminal and control terminal of the current switching unit; second switching unit that conducts ...
Dynamic current sink for stabilizing low dropout linear regulator (ldo)
Mediatek Inc.
February 09, 2017 - N°20170038783

A dynamic current sink includes the following elements. A voltage comparator compares a reference voltage with a second control signal from an ldo (low dropout linear regulator) to generate a first control signal. A first transistor selectively pulls down a voltage at a first node according to the first control signal. The inverter is coupled between the first node and ...
Circuits and methods providing clock frequency adjustment in response to supply voltage changes
Qualcomm Incorporated
January 05, 2017 - N°20170005665

Methods, systems, and circuits for providing compensation for voltage variation are disclosed. A system includes: a voltage comparator configured to assert a control signal in response to detecting that one or more of power supply voltages droops below a threshold amount; a phase locked loop (pll) configured to divide an output frequency for the pll in response to the assertion ...
Output control circuit
Panasonic Intellectual Property Management Co., Ltd.
January 05, 2017 - N°20170005631

A gain control circuit includes: a gain switching controller that changes the gains of a fundamental frequency amplifier and an n-multiplied frequency amplifier; and a detection voltage comparator that determines whether the operating state of an n-multiplier is a saturated operation or a linear operation. The detection voltage comparator determines the operating state of the n-multiplier by comparing an amount ...
Dimming circuit for led
Shenzhen China Star Optoelectronics Technology Co., Ltd.
December 22, 2016 - N°20160374184

A led dimming circuit, configured to control a plurality of led strings to light up at different moment in a cycle, the circuit includes several sets of led strings connected in parallel respectively; driving circuits coupled to the led strings and driving them to light up; control circuits coupled to the driving circuits to control the led series to light ...
Charging system having active error correction for rechargeable batteries
Shenzhen China Star Optoelectronics Technology Co., Ltd.
November 24, 2016 - N°20160344198

A recharging system for a battery. The internal resistance of the battery and its leads produce an error voltage when a charging current flows through the battery and the leads. The error voltage combines with the inherent battery voltage to produce an inflated voltage. A filtering circuit receives the inflated voltage. The filter circuit quantifies the error voltage. A subtractor ...
Voltage comparator circuit and method
Fairchild Semiconductor Corporation
November 17, 2016 - N°20160336932

This document discusses, among other things, a voltage comparator, an integrated circuit, or a voltage comparison method having increased precision. The hysteresis comparator or the integrated circuit can include first and second input transistors, each having a gate configured to receive a respective first or second input voltage. A bias power source can generate a bias current to a first ...
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Voltage comparator
Shenzhen Huiding Technology Co., Ltd.
October 27, 2016 - N°20160315604

The present disclosure is applicable to electronic fields, and provides a voltage comparator. The voltage comparator includes a first branch, a second branch and a third branch. The first branch and the second branch both have self-biasing capabilities, and require no dedicated bias circuit. Under the same power voltage, the static power consumption of the voltage comparator is relatively low; ...
Semiconductor device and temperature sensor system
Renesas Electronics Corporation
September 29, 2016 - N°20160282202

To suppress an increase in the number of voltage comparators with an expansion in a chip temperature detection range, a temperature sensor in a semiconductor device includes a temperature detection circuit for outputting a voltage according to the chip temperature, a reference voltage generating circuit for generating a plurality of reference voltages, and a plurality of voltage comparators for comparing ...
Motor drive controller and method for controlling motor
Minebea Co., Ltd.
September 22, 2016 - N°20160276965

A motor drive controller includes: an advance-angle reference voltage generator that generates an advance-angle reference voltage; a back electromotive voltage comparator that generates phase signals of phases at a cross timing of the advance-angle reference voltage and back electromotive voltages of phases of a motor; and a controller that operates to perform a process including: detecting a rotation speed of ...
Using pmos power switch in a combination switching and linear regulator
Microchip Technology Incorporated
September 15, 2016 - N°20160268885

A p-mos transistor may be used as either a switch in a dc-dc converter or as a pass transistor of a linear regulator. When a supply voltage is above a certain voltage, the p-mos transistor will be used in the dc-dc converter and when below the certain voltage the p-mos transistor will be used in the linear regulator. The supply ...
Three input comparator
Microchip Technology Incorporated
September 08, 2016 - N°20160261258

A three input voltage comparator provides termination of a pulse width modulation (pwm) output in a switched mode power supply. Shutdown of the pwm signal occurs when a sense current from the switching transistors exceeds either or both of the limit and error current references. The three input voltage comparator replaces the generally used two input voltage comparator and also ...
Voltage comparator
Qualcomm Incorporated
August 25, 2016 - N°20160248414

Systems and methods for powering up circuits are described herein. In one embodiment, a method for power up comprises comparing a voltage of a first supply rail with a voltage of a second supply rail, and determining whether the voltage of the first supply rail is within a predetermined amount of the voltage of the second supply rail for at ...
System and method for determining adapter current limit
Intersil Americas Llc
August 25, 2016 - N°20160246316

An electronic device that determines an adapter current limit for a power adapter, including a regulator, a voltage comparator, and a controller. The regulator regulates an adapter output current level to prevent it from exceeding the adapter current limit, and provides a regulation signal during regulation. The voltage comparator provides an under-voltage signal when adapter output voltage level falls below ...
Adc and analog-to-digital converting method
Samsung Display Co., Ltd.
July 28, 2016 - N°20160218729

An analog-to-digital converter includes a successive approximation converter, a voltage comparator, and a controller. The successive approximation converter receives an analog input voltage and a first reference voltage, determines the level of a voltage of a first node as a negative level of the analog input voltage, and using a successive approximation method determines an output logic value corresponding to ...
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