With A Specific Feedback Amplifier (e.g., Integrator, Summer) Patents (Class 323/280)
  • Publication number: 20140028274
    Abstract: Provided is a regulator configured to output a stable voltage even when a power supply voltage fluctuates suddenly. The regulator includes: a reference voltage circuit; a differential amplifier; a depletion type NMOS transistor; and a bleeder circuit, in which a power supply terminal of the differential amplifier is connected to an output terminal of the regulator. Further, a power supply terminal of the reference voltage circuit is connected to the output terminal of the regulator.
    Type: Application
    Filed: July 29, 2013
    Publication date: January 30, 2014
    Applicant: Seiko Instruments Inc.
    Inventor: Daisuke MURAOKA
  • Patent number: 8610415
    Abstract: Method and apparatus to provide lambda correction of a current foldback circuit using a regulator including a current foldback circuit are disclosed herein.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: December 17, 2013
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Gregory A. Maher, Hrvoje Jasa
  • Patent number: 8610370
    Abstract: A method and a device for gradually controlling the illuminating light intensity of light-emitting diodes by modulating the width of current pulses of defined duty cycle, using a DC-to-DC voltage converter and a control circuit for switching the supply current of the light-emitting diodes. Prior to switching the power supply of the diodes the DC-to-DC converter is initiated (A), so as to generate voltage pulses of defined duty cycle; the steady state of each pulse is determined (B), so as to generate a voltage pulse (CP) calibrated to a voltage level substantially corresponding to the steady-state level; and then the light-emitting diodes are powered (D) by applying each calibrated pulse to the light-emitting diodes by means of the switchable control circuit.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: December 17, 2013
    Assignee: Valeo Vision
    Inventors: Sebastian Krick, Loïc Flandre
  • Patent number: 8604762
    Abstract: Low noise, low dropout regulators are described. An example low noise, low dropout regulator includes a chopping error amplifier to receive an input signal and a feedback signal and to output a modified signal having an undesired portion of the input signal shifted to a higher frequency and a regulator to receive the modified signal and to generate an output signal by filtering the undesired portion of the input signal from the modified signal.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: December 10, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Bertan Bakkaloglu, Bhaskar Aravind, Siew K. Hoon
  • Patent number: 8593121
    Abstract: The present disclosure discloses a voltage regulator including a trimming circuit. The present disclosure also discloses a method for trimming an output voltage of a voltage regulator. In one embodiment the voltage regulator may include a power conversion module, a feedback and trimming module and a control module. The voltage regulator may be able to provide an output voltage that could be regulated to a plurality of output values, the feedback and trimming module may be able to trim the plurality of output values to their desired values successively and independently.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: November 26, 2013
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Yike Li, Jiangyun Zhou
  • Patent number: 8593125
    Abstract: A buck switching regulator includes a feedback control circuit including a first gain circuit configured to generate a first feedback signal indicative of the regulated output voltage; a ripple generation circuit configured to generate a ripple signal using the switching output voltage and to inject the ripple signal to the first feedback signal; a second gain circuit configured to generate a second feedback signal indicative of the regulated output voltage; an operational transconductance amplifier (OTA) configured to generate an output signal having a magnitude indicative the difference between the second feedback signal and the first reference signal; and a comparator configured to generate a comparator output signal having an output level indicative of the difference between the output signal of the OTA and the first feedback signal. As thus configured, the buck switching regulator generates an output voltage with increased accuracy and fast transient response.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: November 26, 2013
    Assignee: Micrel, Inc.
    Inventor: Dashun Xue
  • Patent number: 8575905
    Abstract: A voltage regulator includes a regulator input connected to a reference voltage; a regulator output that outputs a regulated voltage to an electrical load; a first loop, the first loop configured to receive the reference voltage, the first loop outputting a bias voltage; a second loop, the second loop configured to receive the bias voltage as an input; and a bias voltage capacitor connected to a node between the first loop and the second loop.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: November 5, 2013
    Assignee: International Business Machines Corporation
    Inventors: John Bulzacchelli, Paul D. Muench, Michael A. Sperling, Zeynep Toprak-Deniz
  • Publication number: 20130285631
    Abstract: A low-dropout voltage regulator includes a power transistor configured to receive an input voltage and to provide a regulated output voltage at an output voltage node. The power transistor includes a control electrode configured to receive a driver signal. A reference circuit is configured to generate a reference voltage. A feedback network is coupled to the power transistor and is configured to provide a first feedback signal and a second feedback signal. The first feedback signal represents the output voltage and the second feedback signal represents an output voltage gradient. An error amplifier is configured to receive the reference voltage and the first feedback signal representing the output voltage. The error amplifier is configured to generate the driver signal dependent on the reference voltage and the first feedback signal. The error amplifier includes an output stage that is biased with a bias current responsive to the second feedback signal.
    Type: Application
    Filed: April 30, 2012
    Publication date: October 31, 2013
    Applicant: INFINEON TECHNOLOGIES AUSTRIA AG
    Inventors: Giovanni Bisson, Marco Flaibani, Marco Piselli
  • Patent number: 8570098
    Abstract: A voltage reducing circuit includes an internal power supply section configured to reduce an external power supply voltage supplied from an external power supply to an internal power supply voltage which is lower than the external power supply voltage based on a reference voltage. A first current control section is configured to control a current flowing through the internal power supply section when the internal power supply voltage is lower than a setting voltage. A second current control section is configured to control the current flowing through the internal power supply section when the internal power supply voltage exceeds the setting voltage.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: October 29, 2013
    Assignee: Renesas Electronics Corporation
    Inventor: Toshikatsu Jinbo
  • Publication number: 20130278233
    Abstract: Disclosed herein are an LDO having a phase margin compensation means and a phase margin compensation method using the same. The phase margin compensation method according to an exemplary embodiment of the present invention includes: outputting, by reference voltage generation unit, reference voltage Vout2 to be applied to a target circuit; outputting voltage Vout1 actually supplied to the target circuit by a supply voltage output unit; comparing the reference voltage Vout2 with the supply voltage Vout1 by the comparator; counting any section of an output signal (pulse signal) from the comparator by predetermined frequency by the duty cycle calculator; and controlling a phase margin of a frequency of output voltage supplied to the target circuit by controlling buffer current based on the duty cycle ratios and the output bit information fedback from the duty cycle calculator by the supply voltage output unit.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 24, 2013
    Inventor: Soo Woong LEE
  • Publication number: 20130271100
    Abstract: A method to maintain stability of a low drop-out linear voltage regulator (LDO). The method includes sensing, by a voltage controlled variable resistor, a node voltage in a feedback network of the LDO linear voltage regulator, wherein the feedback network comprises an error amplifier configured to regulate an output voltage level of the LDO based on a reference voltage, wherein the node voltage has a dependency on a resistive load current of the LDO, and adjusting, by the voltage controlled variable resistor and based on the sensed node voltage, a resistance value of a RC network in the feedback network, wherein the adaptive RC network produces an adaptive zero in a transfer function of the feedback network, wherein the adaptive zero reduces phase margin degradation due to an output non-dominant pole in the transfer function, and wherein a frequency of the adaptive zero is inversely proportional to the resistance value.
    Type: Application
    Filed: March 14, 2013
    Publication date: October 17, 2013
    Applicant: Vidatronic, Inc.
    Inventor: Mohamed Ahmed Mohamed El-Nozahi
  • Publication number: 20130257401
    Abstract: The regulator with low dropout voltage comprises an error amplifier and an output stage comprising an output transistor and a buffer circuit comprising an input connected to the output node of the error amplifier, an output connected to the output transistor, a follower amplifier connected between the input and the output of the buffer circuit. The buffer circuit furthermore comprises a transistor active load connected to the output of the follower amplifier and a negative feedback amplifier arranged in common gate configuration and connected between the output of the follower amplifier and the gate of the transistor of the active load.
    Type: Application
    Filed: March 21, 2013
    Publication date: October 3, 2013
    Applicant: STMicroelectronics (Rousset) SAS
    Inventors: Jimmy Fort, Thierry Soude
  • Patent number: 8547081
    Abstract: A reference voltage supply circuit is provided. The reference voltage supply circuit includes a first amplifier for amplifying a first input voltage and a fed back first reference voltage, a second amplifier for amplifying a second input voltage and a fed back second reference voltage, a reference voltage generator for generating the first reference voltage and the second reference voltage according to output signals of the first and second amplifiers and feeding the first and second reference voltages back to the first and second amplifiers, and a glitch remover turned on/off according to an input pulse signal to conduct or cut off current flowing between a power supply terminal and the ground.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: October 1, 2013
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young Deuk Jeon, Young Kyun Cho, Jae Won Nam, Jong Kee Kwon
  • Publication number: 20130241504
    Abstract: A substantially unconditionally stable LOD regulator includes has first and second current paths. The first current path provides a reference current. The second current path receives an input voltage for developing a differential current with respect to the reference current based on the input voltage. The second current path has a sense resistor for sensing the differential current. A first current source biases the first and second current paths. A third current path senses the differential current and develops the input voltage in response thereto to control the differential current. A second current source biases the second current path. A first voltage follower circuit receives a first voltage on a first side of the sense resistor to provide an analog voltage output, and a second voltage follower circuit receives a second voltage on a second side of the sense resistor to provide a digital voltage output.
    Type: Application
    Filed: March 15, 2012
    Publication date: September 19, 2013
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Ajay Kumar, Krishnaswamy Nagaraj
  • Patent number: 8536935
    Abstract: A system for uniform power regulation of an integrated circuit is disclosed. In each of a plurality of regions, the system includes a comparison circuit having a first input coupled to receive a reference voltage and a second input coupled to receive a feedback voltage. The comparison circuit provides a gating voltage to a driver circuit that is coupled to a first supply voltage. The driver circuit is configured to provide a regulated voltage responsive to the gating voltage. A feedback adjustment circuit is configured to trim the regulated voltage by a region-specific trim value and output the trimmed regulated voltage as the feedback voltage on the output.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: September 17, 2013
    Assignee: Xilinx, Inc.
    Inventors: Thomas P. LeBoeuf, Eric E. Edwards
  • Patent number: 8508200
    Abstract: A power supply circuit comprises a power transistor, a differential amplifier, an I/V converter circuit, and an inverting amplifier, wherein the differential amplifier comprises a first current path in which a first resistor element, a first current mirror transistor, and a first control transistor are connected in series, and a second current path in which a second resistor element, a second current mirror transistor, and a second control transistor are connected in series, and the power supply circuit comprises a phase compensating capacitor element connected in parallel with the inverting amplifier, and a ripple removal rate improving capacitor element which is connected between ground and a connection point between the first resistor element and the first current mirror transistor, or between the ground and a connection point between the second resistor element and the second current mirror transistor.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: August 13, 2013
    Assignees: Semiconductor Components Industries, LLC, Sanyo Semiconductor Co., Ltd.
    Inventors: Ryuji Yamamoto, Yuichi Inakawa
  • Patent number: 8493043
    Abstract: Voltage regulator circuitry is provided. The voltage regulator circuitry may contain a drive transistor that is controlled by the output of an operational amplifier. The drive transistor may supply a regulated voltage to a load. The operational amplifier may compare a reference voltage and a feedback signal at its inputs. The operational amplifier may include first and second stages. An adjustable resistor may be provided between the first and second stages. Control circuitry may control the resistance of the adjustable resistor based on the amount of current flowing through the load to ensure stable operation of the voltage regulator circuitry. Overshoot and undershoot detection and compensation circuitry may compensate for overshoot and undershoot in the regulated voltage. Voltage ramp control circuitry may be used to control the ramp rate of the regulated voltage.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: July 23, 2013
    Assignee: Altera Corporation
    Inventors: Thien Le, Ping-Chen Liu
  • Patent number: 8487595
    Abstract: A circuit includes a first resistor, a second resistor, a voltage follower and a current mirror. The first resistor converts a current flowing through the first resistor to a voltage drop between positive and negative sides of the first resistor. The second resistor is coupled to the negative side of the first resistor. The voltage follower is coupled to the positive side of the first resistor via a non-inverting terminal, and coupled to the negative side of the first resistor through the second resistor via an inverting terminal to cause a voltage at the inverting terminal to follow a voltage at the non-inverting terminal. The current mirror is coupled to the voltage follower to provide a sensing current proportional to the current flowing through the first resistor.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: July 16, 2013
    Assignee: 02Micro Inc.
    Inventors: Serban Mihai Popescu, Christian Andreev
  • Publication number: 20130176008
    Abstract: The present invention discloses a soft start circuit for a power supply device comprising an external P-type transistor for charging an output capacitor to provide an output voltage. The soft start circuit includes a current source, for providing a discharge current; and a disabling means, coupled to the current source, for discharging an equivalent total parasitic capacitor of the external P-type transistor during an activation period according to the discharge current.
    Type: Application
    Filed: January 9, 2012
    Publication date: July 11, 2013
    Inventors: Chih-Chen Li, Chin-Hsun Chen
  • Patent number: 8482266
    Abstract: Apparatus for voltage regulation circuits and related operating methods are provided. An exemplary voltage regulation circuit includes a voltage regulation arrangement that provides a regulated output voltage based on an input voltage reference, a phase compensation arrangement coupled to the voltage regulation arrangement and configured to increase a phase margin of the voltage regulation arrangement, and detection circuitry coupled to the phase compensation arrangement. The detection circuitry is configured to disable the phase compensation arrangement in response to detecting an output current that is less than a threshold value.
    Type: Grant
    Filed: January 25, 2011
    Date of Patent: July 9, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Chuanzhao Yu, Luis J. Briones
  • Publication number: 20130169358
    Abstract: A power supply system includes a high-speed power supply providing a first output, operating in conjunction with an externally supplied DC source or low frequency power supply which provides a second output. A frequency blocking power combiner circuit combines the first and second outputs to generate a third output in order to drive a load, while providing frequency-selective isolation between the first and second outputs. A feedback circuit coupled to the combined, third output compares this combined, third output with a predetermined control signal and generates a control signal for controlling the high-speed power supply, based on a difference between the third output and the predetermined control signal. The feedback circuit does not control the DC source or the low frequency power supply, but controls only the high-speed power supply.
    Type: Application
    Filed: February 26, 2013
    Publication date: July 4, 2013
    Applicant: QUANTANCE, INC.
    Inventor: QUANTANCE, INC.
  • Publication number: 20130147448
    Abstract: A low dropout (LDO) voltage regulator includes a voltage regulation loop for providing a gate drive signal to an output device, the gate drive signal proportional to an output current. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO voltage regulator further includes a current bias control circuit for providing the adaptive bias current at a first value that is proportional to current limit value lab and the width-to-length ratio of transistors of the transconductance amplifier when the output current less than or equal to a threshold and increases the bias current from a threshold to a current limit value. The output current varies substantially linearly over a range of output current values between the threshold and the current limit value.
    Type: Application
    Filed: December 12, 2011
    Publication date: June 13, 2013
    Inventor: Petr Kadanka
  • Patent number: 8461818
    Abstract: A device for improving transient response of a power supply includes a diode connected in series with an output of the power supply and configured to provide a predetermined voltage drop to an output voltage of the power supply. The device further includes a source follower transistor connected in parallel with the diode and configured to be selectively activated to remove at least a portion of the predetermined voltage drop of the diode from the output voltage of the power supply during a transient period, in which an output current of the device is increasing.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: June 11, 2013
    Assignee: Agilent Technologies, Inc.
    Inventor: Michael J. Benes
  • Publication number: 20130141066
    Abstract: A voltage regulator includes a voltage generation unit, a first resistor section, and a second resistor section. The voltage generation unit compares a reference voltage level with a voltage level of a first node and generates an output voltage. The first resistor section includes a first sub-resistor and a second sub-resistor between the first node and a ground voltage node, and controls a connection between the first sub-resistor and the second sub-resistor to change a resistance value of the resistors. The second resistor section includes a reference resistor, a plurality of unit resistors, and a plurality of step resistors, and controls connections of the unit resistors and the step resistors to change a resistance value of the resistors.
    Type: Application
    Filed: August 31, 2012
    Publication date: June 6, 2013
    Applicant: SK HYNIX INC.
    Inventor: Hyun Chul LEE
  • Patent number: 8456235
    Abstract: The present invention is contrived to adopt a differential pair type amplifier circuit comprising a differential pair constituted by a first transistor receiving an input of a first signal and by a second transistor receiving an input of a third signal generated by outputting a second signal of which the voltage level is a power supply voltage. Elements requiring a matching are two transistors constituting the differential pair for the amplifier circuit. Because of this, the elements requiring a matching can be placed close to each other regardless of a layout between the amplifier circuits.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: June 4, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Suguru Tachibana, Kenta Aruga, Tatsuo Kato
  • Publication number: 20130134952
    Abstract: In a power supply circuit, an error amplifier controls a main transistor based on a detection voltage according to an output voltage and a reference voltage corresponding to a target voltage of the output voltage such that the output voltage coincides with the target value. A phase compensation circuit for the power supply circuit includes a level shift circuit and a phase compensation capacitor. The level shift circuit generates a shift voltage by shifting a dc component of the output voltage toward a ground potential by a predetermined voltage, and outputs the shift voltage from an output terminal of the level shift circuit. The phase compensation capacitor is disposed on a route between the output terminal of the level shift circuit and an input terminal of an amplifier circuit of the error amplifier.
    Type: Application
    Filed: November 26, 2012
    Publication date: May 30, 2013
    Applicant: DENSO CORPORATION
    Inventor: DENSO CORPORATION
  • Patent number: 8450991
    Abstract: This disclosure describes an invention that is a basic charge recycling gate 70 that includes a precharge node 75, a output charging network 78, an output pre-charge and null propagate network 77, an evaluation network 76, a first time varying power supply TVS0, a second time varying power supply TVS2, and a keeper circuit 79. Additionally, this disclosure describes an invention that is a time varying power supply 130 that includes a resonator circuit 131, an amplitude and power check circuit 135, one or more overshoot and an undershoot voltage clamps 1105 and 112, exciter circuits 137 and 136, and current monitor circuits 138 and 139. In addition, the invention includes frequency self tuning with the amplitude and power check circuit 135, capacitor banks 132 and 134, and the inductor tap select controller 133. Amplitude self tuning is provided by the amplitude sample and compare circuit 144. Further, a phase shift control circuitry 150 is also provided.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: May 28, 2013
    Assignee: Apple Inc.
    Inventors: Michael Runas, Michael Seningen
  • Publication number: 20130119954
    Abstract: A low-dropout (LDO) voltage regulator includes a switch to generate an output current, and a first sensing module that increases the speed at which the switch is turned off and the output current is decreased in response to detecting a decreasing load current. The LDO regulator further includes a second sensing module that increases the speed at which the switch is turned on and the output current is increased in response to detecting an increasing load current.
    Type: Application
    Filed: November 13, 2012
    Publication date: May 16, 2013
    Applicant: IWATT INC.
    Inventor: iWatt Inc.
  • Publication number: 20130113447
    Abstract: A low dropout (LDO) regulator includes a voltage regulation loop for providing an output voltage to an output terminal, where the output voltage is proportional to a reference voltage. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO regulator also includes a bias current control circuit for providing the bias current at a first value when the reference voltage is greater than a feedback voltage and at a second value higher than the first value when the reference voltage is less than the feedback voltage.
    Type: Application
    Filed: November 8, 2011
    Publication date: May 9, 2013
    Inventor: Petr Kadanka
  • Patent number: 8436597
    Abstract: A low drop-out DC voltage regulator comprising an output pass element for controlling an output voltage (v) of power supplied from a power supply through the output pass element to a load (R), a source of a reference voltage (v), and a feedback loop for providing to the output pass element a control signal tending to correct error in the output voltage. The feedback loop includes a differential module responsive to relative values of the output voltage (v) and the reference voltage (v) and an intermediate module driven by the differential module for providing the control signal. The differential module presents the widest bandwidth of the modules of the regulator and the differential module presents a frequency pole that is higher than the cut-off frequency of the regulator, at which its regulation gain becomes less than one.
    Type: Grant
    Filed: February 4, 2008
    Date of Patent: May 7, 2013
    Assignee: Freescale Semiconductor, Inc.
    Inventor: Thierry Sicard
  • Patent number: 8432144
    Abstract: There is provided a regulator circuit capable of increasing the capacity of the output transistor for supplying current, stably generating an internal power supply voltage and adapting to the reduction of a power supply voltage. The regulator circuit includes an output transistor which is supplied with an external power supply voltage and supplies dropped voltage to an internal circuit, a differential amplifier for outputting a gate potential applied to the gate of the output transistor, a reference voltage generating circuit for supplying a reference voltage to the differential amplifier, and a cut-off transistor for turning off the output transistor to stop supplying power to the internal circuit. The output transistor is comprised of a depression NMOS transistor whose threshold voltage is a negative voltage. The regulator circuit further includes substrate potential control means for controlling the substrate potential of the depression NMOS transistor.
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: April 30, 2013
    Assignee: Renesas Electronics Corporation
    Inventor: Hiromi Notani
  • Patent number: 8427122
    Abstract: A scheme for enhancement of the power-supply ripple rejection for operational amplifiers (op-amps) and low-dropout (LDO) voltage regulators is described. The scheme adds calculated amounts of current derived from the power-supply ripple with the input differential pair current to cancel off the output ripple, improving the high-frequency power-supply ripple rejection without requiring a substantial redesign of the circuitry involved.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: April 23, 2013
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventor: Uday Dasgupta
  • Publication number: 20130082672
    Abstract: There is provided a low drop-out regulator. The low drop-out regulator includes an amplifier including an odd number of operational amplifiers connected to one another in series, and an output unit including a pass transistor operated by an output from the amplifier and generating an output voltage to be applied to a load, wherein the pass transistor is an N-channel transistor, and the amplifier controls a feedback loop gain between an output terminal of one of the odd number of operational amplifiers and the output unit. The feedback loop gain may be controlled independently from the trans-conductance of the pass transistor, whereby the stable output voltage may be generated, even in the case that the load and the input voltage are changed, and the design parameter may be simplified.
    Type: Application
    Filed: January 11, 2012
    Publication date: April 4, 2013
    Inventors: Myeung Su KIM, Joon Hyung LIM, Sang Hoon HWANG, Sang Hyun MIN, Han Jin CHO, Tah Joon PARK
  • Publication number: 20130078939
    Abstract: A fast tracking power supply includes a combined controllable voltage source to control a load voltage. The combined controllable voltage source is connected to a tracking current source in parallel to provide a current for a load. The tracking current source is responsible for providing a low-frequency high current for the load to implement high-efficiency low-frequency tracking of the load current and reducing an output current of the combined controllable voltage source as much as possible. Meanwhile, a power supply voltage switching unit in the combined controllable voltage source adjusts a power supply voltage range of a linear amplifier in the combined controllable voltage source, so as to reduce the power supply voltage range of the linear amplifier, thereby reducing power consumption of the combined controllable voltage source.
    Type: Application
    Filed: November 27, 2012
    Publication date: March 28, 2013
    Applicant: Huawei Technologies Co., Ltd.
    Inventor: Huawei Technologies Co., Ltd.
  • Publication number: 20130076323
    Abstract: A power supply uses a power converter to generate a regulated voltage by referencing to a first DC voltage, a low dropout (LDO) regulator to generate an output voltage from the regulated voltage by referencing to a second DC voltage, and a reference voltage generator to dynamically adjust the first DC voltage according to the input voltage and the control voltage of the output transistor of the LDO regulator. The dropout voltage of the LDO regulator can be minimized to maintain the high efficiency of the power supply at different loading or selected output voltages.
    Type: Application
    Filed: September 10, 2012
    Publication date: March 28, 2013
    Inventors: Tsung-Wei HUANG, Shui-Mu Lin
  • Publication number: 20130076325
    Abstract: A voltage regulator includes a pass transistor, an operational amplifier and a voltage divider circuit. The pass transistor receives a supply voltage to generate a regulated output voltage according to a control signal. The operational amplifier generates the control signal according to a feedback voltage. The voltage divider circuit generates the feedback voltage at a feedback node according to the regulated output voltage, and includes a string of resistors and a stabilization element. The string of resistors is coupled to the pass transistor and includes multiple resistors. The stabilization element is coupled to the resistors and receives the regulated output voltage.
    Type: Application
    Filed: September 12, 2012
    Publication date: March 28, 2013
    Applicant: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Yingyi LIU, Kun LAN, Chih-Chien HUANG, Yu-Kai CHOU
  • Patent number: 8400131
    Abstract: A voltage converter circuit can include a boost converter having a switching transistor and configured to receive an input voltage, produce an output voltage and selectively operate in one of a boost mode, a skip mode and a linear mode. In the boost and skip modes, the boost converter can switch on and off the switching transistor at a switching frequency to produce an output voltage at magnitudes greater than input voltage magnitudes. In the linear mode, the boost converter can turn off the switching transistor at all times to pass the input voltage unboosted to produce an output voltage at magnitudes less than input voltage magnitudes.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: March 19, 2013
    Assignee: Analog Devices, Inc.
    Inventors: Hongxing Li, Tsutomu Wakimoto
  • Publication number: 20130063110
    Abstract: A method is provided. A low dropout regulator (LDO) is disabled during a first mode, and a first reference voltage is selected and applied to a switched-mode converter during the first mode. Also during the first mode, a first output voltage is generated by the switched-mode converter from a power supply, and a first capacitor is overcharged with the first output voltage. The LDO is then enabled during a second mode. During a first portion of a startup period for the second mode, a second capacitor is charged from the first capacitor, and a second reference voltage is selected and applied to the switched-mode converter. Then, during a second portion of the startup period for the second mode, the second capacitor is charged with the switched-mode converter.
    Type: Application
    Filed: September 13, 2011
    Publication date: March 14, 2013
    Applicant: Texas Instruments Incorporated
    Inventors: Vadim V. Ivanov, Harish Venkataraman, Daniel A. King
  • Publication number: 20130063111
    Abstract: A method is provided. A first reference voltage during an idle mode is selected, and the first reference voltage is applied to a switched-mode converter. A first output voltage is then generated by the switched-mode converter from a power supply, and a capacitor is overcharged with the first output voltage. The first output voltage is regulated to generate a second output voltage during the idle mode. Then, a second reference voltage during a quiet mode, where the second reference voltage to the buck converter. During the quiet mode, a third output voltage is generated from the switched-mode converter and from discharging the overcharged capacitor, and the third output voltage is regulated to generate the second output voltage.
    Type: Application
    Filed: September 13, 2011
    Publication date: March 14, 2013
    Applicant: Texas Instruments Incorporated
    Inventors: Vadim V. Ivanov, Harish Venkataraman, Daniel A. King
  • Patent number: 8390965
    Abstract: An over-current protection device for multiple high-voltage motive devices is provided. The over-current protection device includes a comparison module and a logic operation module. The comparison module receives a plurality of voltages generated from a plurality of operating currents of a plurality of high-voltage motive devices and respectively compares the voltages with at least one reference voltage to generate a plurality of comparison results, wherein the high-voltage motive devices are solenoids, electronic clutches, or a combination of solenoids and electronic clutches. The logic operation module receives the comparison results and generates at least one control signal for a plurality of high-voltage motive device driving circuits according to the comparison results. The high-voltage motive device driving circuits respectively drive the high-voltage motive devices according to the control signal.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: March 5, 2013
    Assignees: Cal-Comp Electronics & Communications Company Limited, Kinpo Electronics, Inc.
    Inventors: Chih-Ming Chang, Ju-Chou Chen
  • Publication number: 20130049721
    Abstract: The present invention discloses a linear regulator and a control circuit therefor. The linear regulator includes: a power device coupled between an input voltage and an output voltage; a first error amplifier including a depletion NMOS differential circuit comparing a feedback signal related to the output voltage with a reference signal; a second error amplifier including a native NMOS differential circuit comparing the feedback signal with the reference signal; and a start-up circuit which enables the first error amplifier to dominate control and drive the power device when the linear regulator is at a first stage of a start-up period and enables the second error amplifier to dominate control and drive the power device when the linear regulator is at a second stage after the first stage.
    Type: Application
    Filed: June 29, 2012
    Publication date: February 28, 2013
    Inventors: CHIEH-MIN LO, Tzu-Huan Chiu
  • Patent number: 8384055
    Abstract: An output circuit includes a bias circuit that operates when a power supply voltage equal to or larger than a predetermined voltage is applied, a differential amplifier circuit that outputs signals according to input differential signals upon receiving a bias current or bias voltage generated when the bias circuit is operated, an output stage circuit that receives differential signals according to an output from the differential amplifier circuit and outputs output signals according to the differential signals, the output stage circuit having fewer number of stages of elements connected in series than the bias circuit, and a pull-down circuit that forcibly sets a level of one of the differential signals received by the output stage circuit to a ground voltage to fix the level of the output signals output from the output stage circuit when the bias current or the bias voltage generated by the bias circuit is not supplied.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: February 26, 2013
    Assignee: Renesas Electronics Corporation
    Inventors: Masafumi Shimizu, Satoshi Yoshimura
  • Patent number: 8378652
    Abstract: A voltage controlled current source circuit is utilized to clamp the internal compensation node of a low dropout (LDO) regulator with an NMOS output during load transients. The circuit senses a voltage drop of the internal node and mirrors its current to the internal node to hold the internal node voltage when the voltage starts to drop low enough to turn off the output transistor.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: February 19, 2013
    Assignee: Texas Instruments Incorporated
    Inventor: Yong Xie
  • Patent number: 8378657
    Abstract: Circuits and methods for paralleling voltage regulators are provided. Improved current sharing and regulation characteristics are obtained by coupling control terminals of the voltage regulators together which results in precise output voltages and proportional current production. Distributing current generation among multiple paralleled voltage regulators improves heat dissipation and thereby reduces the likelihood that the current produced by the voltage regulators will be temperature limited.
    Type: Grant
    Filed: August 14, 2009
    Date of Patent: February 19, 2013
    Assignee: Linear Technology Corporation
    Inventor: Robert C. Dobkin
  • Patent number: 8373395
    Abstract: A power source apparatus includes: a switch circuit to receive an input voltage; a control circuit to switch the switch circuit from a second state to a first state at a timing corresponding to a comparison result between a feedback voltage generated based on a first voltage corresponding to an output voltage and a reference voltage generated based on a standard voltage set in accordance with the output voltage; and a voltage generation circuit to add a compensation voltage generated by voltage-converting a time period in which the switch circuit switches from the second state to the first state to one of the first voltage and the standard voltage, to generate the feedback voltage, to add a slope voltage which changes at a slope to one of the first voltage and the standard voltage, and to generate the reference voltage.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: February 12, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Makoto Yashiki
  • Patent number: 8373398
    Abstract: Area-efficient voltage regulators are provided in which a first transistor has a first breakdown voltage and a first on-state resistance and a second transistor has a second breakdown voltage that exceeds the first breakdown voltage and a second on-state resistance that exceeds the first on-state resistance. With this arrangement, the second transistor can be biased to raise an output voltage. When the difference between an input voltage and the output voltage is less than a predetermined voltage, the second transistor is disabled and the first transistor is controlled to provide the output voltage at a wherein the controlling is preferably performed with a feedback control loop. The die area of the first transistor can be reduced because its on-state breakdown need only exceed the predetermined voltage rather than the substantially-higher input voltage.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: February 12, 2013
    Assignee: Analog Devices, Inc.
    Inventor: Wooseok Kim
  • Publication number: 20130033244
    Abstract: Various embodiments of the present invention provide apparatuses and methods for regulating an output voltage. For example, an apparatus is discussed that includes a low dropout regulator having a pass transistor and an amplifier and being operable to regulate the output voltage based on a feedback signal and a feedforward signal. The apparatus also includes an auxiliary low dropout regulator having an auxiliary pass transistor and an auxiliary amplifier. The auxiliary dropout regulator is operable to generate the feedforward signal and is substantially matched with the amplifier.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 7, 2013
    Inventor: Sungmin Ock
  • Patent number: 8368376
    Abstract: An electronic device with a power switch capable of regulating power dissipation includes a power supply device; a power switch, for providing an output voltage; and a current regulating circuit, which includes an adaptive control unit, for outputting a regulating signal, according to the voltage difference between the power supply device and the output voltage; and a switch control unit, for outputting a switch control signal to control the magnitude of the current through the power switch, according to the regulating signal.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: February 5, 2013
    Assignee: Anpec Electronics Corporation
    Inventors: Chieh-Wen Cheng, San-Yi Li
  • Publication number: 20130027010
    Abstract: A voltage regulator includes a current bridge and first and second current paths coupling a current mirror to respective first and second voltage-to-current converters. The current mirror controls a second current dependent on a first current. The first voltage-to-current converter controls the first current dependent on either a reference voltage or a feedback voltage derived from the regulator's output voltage, and the second voltage-to-current converter controls the second current dependent on the other of the feedback and reference voltages. Voltage-to-current conversion by the first converter is independent of voltage-to-current conversion by the second converter. An output transistor stage coupled to the second current path controls the output voltage dependent on the voltage in the second current path indicative of a deviation of the second current from a target current value dependent on the reference voltage.
    Type: Application
    Filed: October 1, 2012
    Publication date: January 31, 2013
    Applicant: ST-ERICSSON SA
    Inventor: ST-Ericsson SA
  • Publication number: 20120313597
    Abstract: A linear regulator and a method of regulating a supply voltage are provided. Embodiments include a linear regulator with a first feedback loop and a second feedback loop. The first feedback loop is characterized by a first bandwidth and a first gain. The first feedback loop includes a first amplifier characterized by an output impedance which is significantly reduced in order to maximize the bandwidth of the first feedback loop when driving the capacitance of a control input of a series pass element. The second feedback loop is characterized by a second bandwidth and a second gain. The second feedback loop includes a second amplifier that controls the current in the first amplifier in the first feedback loop.
    Type: Application
    Filed: June 7, 2011
    Publication date: December 13, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Bradford L. Hunter, Todd M. Rasmus