Abstract: In some examples, a shunt regulator includes a plurality of selection pins configured to receive a digital signal. The shunt regulator also includes an internal reference voltage selection circuit coupled to the plurality of selection pins, the internal reference voltage selection circuit configured to select a first internal reference voltage of the shunt regulator based on the digital signal. The shunt regulator further includes a soft ramp control circuit coupled to the internal reference voltage selection circuit and to a soft ramp control pin that is configured to carry a second internal reference voltage, the soft ramp control circuit configured to compare the first and the second internal reference voltages to generate a soft ramp control output signal.

Abstract: Compensation circuits, compensated voltage regulators, and methods are provided for stabilizing voltage regulators, or other circuits that use operational amplifiers, over a wide range of output current. The described techniques provide a zero whose frequency varies linearly with an output current, and which can be used to track and compensate for a pole whose frequency similarly varies with the output current. The variable-frequency zero is created using a compensation capacitor placed in series with a variable resistance, wherein the resistance is configured to vary linearly with the output current. A pole-tracking zero generated in this way may be used to overcome difficulties encountered when the gain of a system includes a pole whose frequency varies with output current, and serves to improve the phase margin of amplifier circuitry, including that used within voltage regulators, and/or serves to ensure stability over a wide range of output current.

Abstract: A voltage regulator has a slow loop for providing a regulated DC current and a fast loop for providing a transient current. Feedback information is used to monitor the output voltage and control the current used to generate the output voltage. The voltage regulator does not need a capacitor to create transient current.

Abstract: An electronic device includes a first circuit having a first ground that receives first and second control signals. A third control signal is produced by a second circuit. The second circuit uses a second ground, and the first ground floats with respect to the second ground. The first circuit determines a value corresponding to a value of a third control signal using a difference between a value of the first control signal and a value of the second control signal, the value of a third control signal being a value relative to the second ground. The first circuit controls a value of an output signal of the first circuit according to the value corresponding to the value of a third control signal.

Abstract: A voltage regulator may be provided that includes a first circuit to receive at least one feedback signal from a buck converter and to provide at least one driving signal to the buck converter to provide an output voltage based on the at least one feedback signal, and a second circuit to control a super-capacitor to provide the output voltage when the first circuit is not using the buck converter to provide the output voltage.

Abstract: A voltage regulator power reporting offset system includes a monitored power reporting subsystem that determines a monitored power level, offsets the monitored power level using voltage regulator operation offset information to provide a first offset monitored power level, and reports the first offset monitored power level to voltage regulator operation components. A processor power reporting component receives the report of the first offset monitored power level from the monitored power reporting subsystem. A processor power reporting offset subsystem receives the report of the first offset monitored power level from the processor power reporting component, offsets the first offset monitored power level using the processor operation offset information to provide a second offset monitored power level that is different than the first offset monitored power level, and reports the second offset monitored power level to a processing system.

Abstract: A voltage regulator which provides an output current at an output voltage at an output node of the voltage regulator, based on an input voltage at an input node of the voltage regulator is described. The voltage regulator has an output amplification stage for deriving the output current at the output node from the input voltage at the input node in dependence of a drive voltage. Furthermore, the voltage regulator has a differential amplification stage to determine the drive voltage in dependence of the output voltage and in dependence of a reference voltage. In addition, the voltage regulator has an adaption unit to determine a capacitance indication of a capacitor value of an output capacitor coupled to the output node of the voltage regulator. The adaption unit also adapts the differential amplification stage in dependence of the capacitance indication.

Abstract: A control circuit provides a signal to a control terminal of the transistor to control the conductivity of the transistor. The control circuit includes a voltage-to-current converter that provides an indication of the control terminal-to-current terminal voltage of a transistor. The control circuit includes control circuitry that uses the indication from the voltage-to-current converter in controlling the current applied to the control terminal.

Abstract: In an example, an apparatus includes: a pass device coupled between a supply voltage node and a load circuit and to provide a regulated voltage to the load circuit in response to a control signal received at a control terminal of the pass device; a first amplifier to compare a reference voltage to the regulated voltage and to output a comparison signal at a comparison node in response to the comparison; a second amplifier having an input device having a control terminal coupled to the comparison node to receive the comparison signal and to output the control signal to the pass device based at least in part in response to the comparison signal; and a feedback circuit to provide a feedback signal to the first amplifier based at least in part on a load current of the load circuit.

Abstract: Disclosed is a low dropout (LDO) voltage regulator that includes a differential amplifier configured to amplify a differential between a reference voltage and a regulated output voltage, a pass transistor coupled to the differential amplifier and driven by an output of the differential amplifier, a compensation capacitor coupled to an output node of the differential amplifier, and an auxiliary amplifier, wherein an output node of the auxiliary amplifier is coupled to the compensation capacitor, and wherein an input node of the auxiliary amplifier is coupled to the pass transistor.

Abstract: A power supply system includes a power source; a load device configured to receive power from the power source; and a power interface device coupled to the power source and the load device and configured to change a first voltage provided by the power source to a second voltage for operating the load device. The power interface device include a main switching converter configured to operate at a first switching frequency and source low frequency current to the load device and an auxiliary switching converter coupled in parallel with the main switching converter and configured to operate at a second and different switching frequency and source fast transient high frequency current to the load device.

Abstract: An output circuit at the output of an LDO regulator has two FETs (Field-Effect Transistors), a current source and a capacitor. The first FET is connected to the LDO output and a second voltage supply. The second FET is connected in series with the current source between the LDO output and the second voltage supply. The second FET is connected to the first FET in such a matter that a bias voltage is supplied to the first FET so that in static conditions the first FET draws predetermined amounts of current from the LDO output and to divert the predetermined amounts of current to the LDO output or to draw additional amounts of current from the LDO output to compensate for transient currents on the LDO output and to reduce variations in the output voltage of the LDO regulator.

Abstract: The present invention relates to a linear regulator with real-time frequency compensation function, which belongs to the technical field of analog integrated circuits. The part of frequency compensation of the present invention includes the dual-frequency compensation networks and compensation transfer switcher, and the pulse delay circuit. The dual-frequency compensation networks and compensation transfer switcher provide the corresponding frequency compensation for linear regulator under two different capacitive loads. The pulse delay circuit generates a set of signals which have a delay related to the switch-pulse signals to control the access of the compensation transfer switcher and capacitive load.

Abstract: Provided is a voltage regulator having satisfactory transient response characteristics. The voltage regulator includes: a first amplifier for detecting that undershoot occurs in an output voltage; a second amplifier for detecting that overshoot occurs in the output voltage; a first constant current circuit for increasing a bias current of an error amplifier circuit by a first amount for a first time period in response to a signal determined based on one of an output signal of the first amplifier and an output signal of the second amplifier; a second constant current circuit for increasing the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal determined based on the output signal of the first amplifier; and a first switch circuit for pulling up a gate of an output transistor in response to a signal determined based on the output signal of the second amplifier.

Abstract: A reference circuit may include a bandgap reference stage, a filter stage, and a buffer stage. The reference stage may be configured to generate a reference voltage or current. The filter stage may be coupled to the reference stage and may be configured to receive the reference voltage or current, filter noise from the reference voltage or current, receive a buffer output voltage or current, and filter noise from the buffer output voltage or current. The buffer stage may be coupled to the filter stage and may be configured to isolate the reference stage and the filter stage from a loading effect of a load circuit and generate a reference signal based on the reference voltage or current to drive the load circuit.

Abstract: A voltage regulator which provides an output current at an output voltage at an output node, based on an input voltage at an input node is described. The voltage regulator has an output amplification stage comprising a pass transistor for deriving the output current at the output node from the input voltage at the input node; and comprising a driver stage to set a gate voltage at a gate of the pass transistor based on a drive voltage. A gain of the output amplification stage is adjustable. Furthermore, the voltage regulator comprises a differential amplification unit to determine the drive voltage in dependence of the output voltage and in dependence of a reference voltage. In addition, the voltage regulator comprises a gain control circuit to adjust the gain of the output amplification stage in dependence of the output current.

Abstract: In one example, a circuit includes a pass module, a first sensing module, a second sensing module, a decision module, and a control module. The pass module is configured to modify, based on a control signal, a resistance of a channel that electrically connects an input voltage and a load. The first sensing module is configured to generate a first sensed current. The second sensing module is configured to generate a second sensed current. The decision module is configured to generate a first decision current, generate a second decision current, and generate a composite sensed current based on a summation of the first decision current, the second decision current, the first sensed current, and the second sensed current. The control module is configured to generate the control signal based on the composite sensed current.

Abstract: A power interface device includes a main switching converter and an auxiliary switching converter. The main switching converter is coupled to an input terminal and an output terminal and configured to operate at a first switching frequency to source a low frequency current from the input terminal to the output terminal. The auxiliary switching converter is coupled to the input terminal and the output terminal in parallel with the main switching converter and configured to operate at a second and higher switching frequency than the first switching frequency to source a fast transient high frequency current from the input terminal to the output terminal.

Abstract: An output circuit (10) according to the present invention includes a first output terminal (VO) and a second output terminal (SGND); an output transistor (MP1) connected between a first fixed-potential node (VCC) and the first output terminal; an output load (15) connected between the first output terminal and the second output terminal; a control circuit (13) that controls the output transistor so that a monitor voltage (VS) based on a voltage between the first output terminal and the second output terminal matches an input voltage (VI); a constant voltage source (16) whose one end is connected to the second terminal and whose other end is connected to a second fixed-potential node (GND); and a circuit (R4) that forms a current path between the first output terminal and the second fixed-potential node. Accordingly, in the output circuit, stability of a negative feedback loop can be enhanced, and linearity of an output voltage with respect to an input voltage can be enhanced.

Abstract: A low-dropout regulator with super transconductance structure relates to the field of power management technology. The super-transconductance structure refers to the circuit structure in which the voltage signal is converted into a current signal and amplified with a high magnification. The error amplifier EA in the present invention uses the super transconductance structure. The differential input pair of the error amplifier EA samples the difference between the feedback voltage VFB and the dynamic reference voltage VREF1. The difference is converted into a small signal current, which goes through a first-stage of current mirror to be amplified by K1, and through a second-stage of current mirror to be amplified by K2. The amplified signal is used to regulate the gate of the adjustment transistor MP. The error amplifier EA with the super transconductance structure is used to expand the bandwidth of the error amplifier EA.

Abstract: A control circuit for an interleaved switching power supply having a plurality of parallel coupled power stage circuits, can include: a feedback circuit that receives an output voltage of the interleaved switching power supply, and generates an output voltage feedback signal; a ripple generator that receives a plurality of switching control signals, and generates an AC ripple signal having a frequency that is N times a switching frequency; an adder circuit that adds the output voltage feedback signal with the AC ripple signal, and generates a superposition signal; a comparison circuit that receives the superposition signal and a reference voltage, and generates a comparison signal; and a frequency divider circuit that divides the comparison signal into a plurality of turn on control signals configured to control turn on of a plurality of main power switches in the plurality of power stage circuits.

Abstract: A dual function solid state power converter operable from a three phase AC input current simultaneously provides; an AC or DC output current on an aircraft power cable to provide ground power to a parked aircraft, and a low voltage DC current on a battery charging power cable to charge batteries in nearby service vehicles. The power converter includes an AC to DC converter which converts the current on an internal DC bus, a DC to AC converter which converts the DC bus current to an AC current at a higher voltage and frequency, or a DC to DC converter which converts the DC bus current to a lower voltage DC, for supplying ground power to a parked aircraft, and a DC to DC converter for converting the DC bus current to a lower voltage battery charging current on the battery charging cable.

Abstract: A voltage droop reduction circuit generally including a loop coupled to an output of a voltage regulator is provided. The loop includes a first current amplifier. The voltage droop reduction circuit may also include a first capacitor coupled between the output of the voltage regulator and an input of the first current amplifier.

Abstract: A linear regulator is presented. It comprises a first amplifier stage, one of the inputs being coupled with the output of the linear regulator. It has an intermediate amplifier stage. The input of the intermediate amplifier stage is coupled to the output of the first amplifier stage. It has a driver stage having a pass device driven by the output of the driver stage. The output of the pass device provides the output of the linear regulator. The regulator has a voltage-to-current feedback circuit coupled with the driver stage and the output of the first amplifier stage for regulating the output resistance of the first amplifier stage depending on load conditions of the linear regulator. The voltage-to-current feedback circuit has a transistor and a current limitation circuit to limit the regulation of the output resistance of the first amplifier stage to low load conditions of the linear regulator.

Abstract: The present disclosure provides a low dropout linear voltage regulator, including: an amplifier, configured to have a first input end receiving a reference voltage, a second input end configured to receive a feedback voltage, and an output end connected to a first node; an output transistor, having a control end connected to the first node, a first end connected to a first power source potential, and a second end connected to a second node and configured to provide an output voltage; a feedback circuit, connected to the second node and configured to provide the feedback voltage according to the output voltage; and a compensation circuit, comprising at least one of a first compensation amplifier, a second compensation amplifier and a first variable current source. The compensation circuit detects and suppresses a voltage transient generated when a load switching from light to heavy occurs at the second node.

Abstract: An information collection circuit includes a control circuit, which collects information of a measurement subject from a detection circuit, and a rectification circuit, which rectifies electromotive force. A first switch, coupled between the rectification circuit and the control circuit, becomes conductive based on DC voltage generated by the rectification circuit. A second switch, coupled between the control circuit and a battery, becomes conductive based on a control signal provided from the control circuit. The second switch is non-conductive when the control circuit is inactive. The control circuit is activated by a first power voltage supplied via the first switch to control the second switch to become conductive, and is operated based on a second power voltage supplied from the battery via the conductive second switch.

Abstract: A gray-scale voltage generating circuit includes a ladder resistor circuit and a constant current source. The ladder resistor circuit includes a plurality of resistors connected in series to one another, and is configured to output a plurality of gray-scale voltages with different voltage values from ends of the respective resistors. The constant current source is configured to be connected in series to the ladder resistor circuit.

Abstract: A voltage control device includes an output module and a control module. The output module provides an output current at an output terminal thereof based on a control voltage. The control module includes a comparing circuit, a capacitor, a charging circuit and a discharging circuit. The comparing circuit compares a to-be-compared voltage, which is associated at least with a to-be-controlled voltage at the output terminal of the output module, with a predetermined reference voltage to generate a comparison signal. The capacitor provides the control voltage. The charging circuit is operable to charge the capacitor based on the comparison signal. The discharging circuit is operable to discharge the capacitor based on the comparison signal.

Abstract: A gray-scale voltage generating circuit includes: a ladder resistor circuit including a plurality of resistors connected in series to one another, and configured to output a plurality of gray-scale voltages with different voltage values from ends of the respective resistors; and a constant current source configured to be connected in series to the ladder resistor circuit, in which the constant current source includes a current source transistor configured to be connected in series to the ladder resistor circuit, and a voltage setting section configured to select one voltage from the plurality of voltages and set the selected voltage as a voltage determining a current that is to flow through the current source transistor.

Abstract: Provided is a voltage regulator configured to stably operate with low current consumption, and having good responsiveness. A delay circuit is provided between a transient response improvement circuit and a voltage amplifier circuit.

Abstract: Devices and methods to design voltage regulators requiring lower power consumption, wide output current and input voltage range, low dropout, and small footprint. The disclosed methods and devices provide solutions to stabilize such regulators in the presence of widely varying loads.

Abstract: A method to adjust the load transient regulation of a low drop-out (LDO)/load switch linear voltage regulator (LVR) with an n-type pass element having an open loop transfer function, including determining during a load transient event if the gate of the pass—element goes lower than a scaled value of the output voltage or a constant voltage level, generating a control signal that controls a current sink block if the gate voltage of the pass element is lower than the output voltage, and enabling a current sink block that is controlled by the control signal and connecting the output of the current sink block to the output of the LVR.

Abstract: In some examples, a voltage regulator comprises an amplifier stage and a pass element configured to receive an output of the amplifier stage and an output of a feedback circuit. The voltage regulator further comprises the feedback circuit configured to receive an output of the pass element, wherein the feedback circuit includes a differentiator stage coupled to a feedback output stage, and wherein the differentiator stage comprises a single capacitor configured to differentiate an output voltage of the pass element.

Abstract: A voltage regulator circuit with variable feedback is disclosed. In one embodiment, a voltage regulator includes an amplifier having a first input configured to receive a reference voltage and a second input configured to receive a feedback signal. The voltage regulator further includes first and second transistors each having respective gate terminals coupled to an output of the amplifier. A resistor network coupled to the second input of the amplifier and further coupled to the first and second transistors. The resistor network is configured to produce the feedback signal based on currents through the first and second transistors, respectively.

Abstract: A supply modulator including a first switched-mode power supplier configured to transmit a modulated voltage to an output node in response to an envelope signal, the first switched mode power supplier including: a switching circuit configured to transmit a pulse signal in response to the amplitude of the envelope signal; and a low pass filter configured to generate the modulated voltage by filtering certain frequency band of the pulse signal, the low pass filter comprising a plurality of stages; and a second switched-mode power supplier configured to selectively transmit a compensation current to the output node in response to the current transmitted from the first switched-mode power supplier, wherein each of the plurality of stages of the low pass filter comprises at least one variable impedances.

Abstract: The regulator with a low dropout voltage comprises an error amplifier comprising a differential pair of input transistors and a circuit with folded cascode structure connected to the output of the said differential pair, an output stage connected to the output node of the error amplifier, and a Miller compensation capacitor connected between the output stage and the cascode node on the output side (XP) of the cascode circuit; the error amplifier furthermore comprises at least one inverting amplifier module in a feedback loop between the said cascode node and the gate of the cascode transistor of the cascode circuit connected between the said cascode node and the said output node.

Abstract: A feedback controlled coil driver with ASK modulation is disclosed. A class E coil driver drives an LC circuit to generate a magnetic signal via the inductor. A modulation capacitor is coupled to the LC circuit to modulate the coil driver signal. The voltage across the coil driver switch is sampled. The difference between the sampled voltage and a reference voltage is integrated and compared to a ramp voltage to obtain an optimal on time for the coil driver switch such that coil current is maximized.

Abstract: A low drop-out regulator circuit comprises a pass transistor providing an output voltage on an output terminal in response to a gate voltage on a gate of the pass transistor. A feedback circuit is coupled to the output terminal to generate a feedback voltage, and an error amplifier provides a drive signal in response to a reference voltage and the feedback voltage. A first gate driver circuit is operable over a first voltage range to provide the gate voltage to the pass transistor in response to the drive signal. A second gate driver circuit is operable over a second voltage range to provide the gate voltage to the pass transistor in response to the drive signal, where the second voltage range is lower than the first voltage range.

Abstract: An apparatus comprises a radio frequency (RF) transceiver circuit; a phase modulator that comprises digital-to-time converter (DTC) circuitry configured to convert a digital value to a specified signal phase of a signal transmitted by the RF transceiver circuit; low drop out regulator (LDO) circuitry operatively coupled to the DTC circuitry, wherein a bias current of the LDO circuitry is adjustable; and logic circuitry operatively coupled to the LDO circuitry and DTC circuitry, wherein the logic circuitry is configured to set the adjustable bias current of the LDO circuitry according to a digital value input to the DTC circuitry.

Abstract: Apparatus disclosed herein implement a fast transient precision current limiter such as may be included in an electronic voltage regulator. The current limiter includes two current sense element/current clamp control loops. A fast response time control loop first engages and clamps a current spike. A precision control loop then engages to more accurately clamp the output current to a programmed set point. The precision clamping loop includes an inner loop to linearize the precision current sense element. The inner loop forces the drain-to-source voltage (VDS) of the precision sense element to track the VDS of the regulator pass element. A more precise clamping operation results. Overall speed is not sacrificed as the fast response time clamping loop operates in parallel to protect circuitry while the precision clamping loop engages.

Abstract: A low dropout regulator (LDO) is disclosed. The LDO includes a transistor loop including a first transistor coupled to a second transistor. The first transistor and the second transistor coupled to a first resistor and a second resistor. The first resistor being coupled to ground and second resister coupled to the first resistor. The LDO further includes an output transistor coupled to the second transistor and a power supply line. The output transistor further coupled to a pair of input transistors coupled to the power supply line. One of the input transistors coupled to a third resistor, wherein the third resistor coupled to a fourth resistor and the fourth resistor coupled to ground. The LDO also includes a fifth resistor coupled to an output of the output transistor. The fifth resistor is coupled to the first transistor.

Abstract: A power supply device, including: a switching structure for controlling a continuous current in an inductive load on the basis of at least one control signal of a power switch; and anomaly detection elements, generating at least one item of information about the detection of an anomaly of the open circuit type in the wiring from the load to the switching structure. The anomaly detection elements include: elements for measuring the current flowing in the inductive load; elements for comparing the measured current continuously with a threshold value; and elements for counting a time interval during which the measured current remains continuously below the threshold value, delivering the anomaly detection information if the counted time interval>a reference time interval, which is k times greater than a period of the control signal, where k>1, and if the duty cycle of the control signal>a threshold value.

Abstract: A display driving device includes a first source amplifier that receives first display data and supplies a first pixel voltage to a first pixel based on the received first display data, and a second source amplifier that receives second display data and first control data and supplies a second pixel voltage to a second pixel based on the received second display data and first control data. The second source amplifier has a first stage in which a first process is performed on an input signal based on the second display data, and a second stage in which a second process is performed on the first processed input signal to output the second pixel voltage. The first source amplifier may be configured to conditionally supply the first pixel voltage to the second pixel.

Abstract: Aspects of the present invention include a low-dropout (LDO) linear power supply system. The system includes a pass-element configured to generate an output voltage at an output based on an input voltage. The system also includes a compensation amplifier stage coupled to the output and configured to provide frequency compensation and provide a desired frequency response of the output voltage. The system further includes a gain amplifier stage interconnecting the compensation amplifier stage and the pass-element and configured to provide DC gain scaling to generate the output voltage substantially proportional to the input voltage within a given range of the input voltage.

Abstract: Various circuits and methods are disclosed for generating a regulated voltage. According to an example embodiment, an apparatus includes a voltage regulation circuit including a transistor having a channel between source and drain nodes and a gate for affecting current passing through the channel. The voltage regulation circuit configured and arranged to generate, from a voltage source, a regulated voltage at an output node. The voltage regulation circuit exhibits a transfer function having a pole-frequency that varies in response to changes in the current passed by the transistor. The apparatus also includes a current control circuit connected to the voltage regulation circuit, and configured to adjust current provided to the output node to maintain a relatively constant current through the transistor.

Abstract: A voltage reference source includes a source block, a first resistor having a first terminal coupled to a first terminal of the source block, a reference output for providing a reference voltage, and a first and a second mirror transistor forming a first current mirror. The first mirror transistor couples a second terminal of the source block to a supply voltage terminal and the second mirror transistor couples the reference output to the supply voltage terminal. A series connection of a second resistor and a diode is arranged between the reference output and the first terminal of the first resistor. A mirror current flows through the second mirror transistor and the series connection to the first terminal of the first resistor.

Abstract: In a semiconductor device, power consumption is reduced. Further, a standby circuit is formed of a few elements, and thus increase in the circuit area of the semiconductor device is prevented. The standby circuit provided in the semiconductor device is formed of only one transistor and voltage supplied to the transistor is switched, whereby output current of the semiconductor device is controlled. As a result, the output current of the semiconductor device in a standby state can be substantially zero, so that the power consumption can be reduced. By using an oxide semiconductor for a semiconductor layer of a transistor, leakage current can be suppressed as low as possible.

Abstract: A digital LDO regulator includes a first comparison circuit to compare an output voltage with a reference voltage and to output a reference load switching signal when the output voltage rises above the reference voltage, a logic circuit to output a control current in response to the reference load switching signal, a second comparison circuit to compare the output voltage with a transient reference voltage and to output a transient load switching signal when the output voltage rises above the transient reference voltage, a switching circuit to control the logic circuit to pass a transient current in response to the transient load switching signal, a circuit to provide a mirroring current to the logic circuit after a transient state, a load current supply circuit to switch in response to the control current and to supply a load current, and a capacitor coupled to the load current supply circuit.

Abstract: Apparatus and methods to increase the range of a signal processing circuit. A system uses floating bias circuits coupled to a signal processing circuit to increase the range of power supplies that can be used with the signal processing circuit, while maintaining the components of the signal processing circuit within a breakdown voltage threshold. As the voltage level of the data signal varies, the voltage level of the floating bias circuits varies as well.

Abstract: Memory devices and methods of making and operating them are shown. Memory devices shown include stacked memory dies with one or more buffer dies included. In one such memory device, a command die communicates with one or more downstream memory dies through the one or more buffer dies. The one or more buffer dies function to repeat signals, and can potentially improve performance for higher numbers of memory dies in the stack.