Abstract: A low drop-out regulator is configured to provide high output current with a fast response during transient conditions, while also maintaining low quiescent current under DC conditions. An exemplary low drop-out regulator comprises an error amplifier, a current feedback amplifier, and a pass device. The low drop-out regulator includes a composite amplifier feedback configuration, with the current feedback amplifier being decoupled from the overall composite feedback configuration and configured to provide effective compensation. As a result, the current feedback amplifier can be configured to operate with low current supplied from the error amplifier and to drive the control terminal of the pass device with sufficiently high current as demanded by a load device. In addition, the current feedback amplifier can be configured to permit the voltage at the control terminal of the pass device to operate from rail-to-rail.

Abstract: The regulator circuit with an auxiliary boundary regulator that provides enhanced transient response includes: an upper comparator 24 having a first input coupled to a feedback node and a second input coupled to a first reference voltage node V_HIGH; a lower comparator 26 having a first input coupled to the feedback node and a second input coupled to a second reference voltage node V_LOW; a first switching device 30 having a control node coupled to an output of the upper comparator 24; a second switching device 28 having a control node coupled to an output of the lower comparator 26; an inductor 36 having a first end coupled to the first and second switching devices 28 and 30, and a second end coupled to an output node Vout; and a feedback circuit 32 and 34 coupled between the output node Vout and the feedback node.

Abstract: An electrical circuit arrangement for converting an input voltage into an impressed electrical output variable, to convert the input voltage optionally into an output voltage or into an output current, wherein the input voltage is fed to the desired value input of a regulator. A negative feedback voltage is fed to the actual value input of the regulator, the voltage being a measure of the respectively effective output variable. For converting the input voltage into an impressed output voltage, the negative feedback voltage is a voltage proportional to the output voltage. For converting the input voltage into an impressed current, the negative feedback voltage is a voltage dropped across a resistor through which the output current flows. Circuit arrangements of this type serve for further processing of a unipolar voltage in circuit arrangements which require a current as input variable, or a voltage whose range deviates from that of the input voltage. This is the case e.g.

Abstract: A method and apparatus to provide a low voltage reference generation. The apparatus includes a reference voltage generator to receive a first input voltage signal and output a reference voltage signal. A voltage level detector electrically coupled to the reference voltage generator to receive the reference voltage signal and also receive a second input voltage signal. The voltage level detector compares the second input voltage signal to the reference voltage signal for generating an output based on the compared signals.

Abstract: A Miller compensated voltage regulator, adapted to be supplied with power from a voltage supply, and having an input port and an output port. The voltage regulator includes a voltage regulation circuit responsive to a reference voltage at the input port to provide a regulated voltage at the output port. The voltage regulation circuit includes a first amplifier adapted to receive a reference voltage at a first input, having a second input, and having an output, and also a second amplifier having a first input coupled to an internal node, the internal node being coupled to the output of the first amplifier, the second amplifier having a second input adapted to receive a bias voltage and having an output. A pass transistor is provided having a source coupled to the voltage supply, having a drain coupled to the output port, and having a gate coupled to the output of the second amplifier, and a Miller compensation capacitor is provided coupled between the output port and the internal node.

Abstract: A circuit for boosting an input voltage (VIN) to provide a low ripple output voltage (VOUT) regulates flow of current between a source of the input voltage (VIN) and a circuit node (17) in response to a feedback signal (16) representative of the output voltage (VOUT). A charge pump circuit operates to repetitively charge a pump capacitor (CPMP) to a voltage equal to the input voltage (VIN) and redistribute charge between the pump capacitor (CPMP) and a level-shifting capacitor (CLS) coupled between the circuit node (17) and an output conductor (15) conducting the output voltage (VOUT) so as to maintain the boosted output voltage (VOUT).

Abstract: The present invention relates a Pulse Width Modulation (PWM)/linear driver for an electromagnetic load by a bridge circuit of the type having a signal input and a signal output and at least two conduction control inputs for driving a voice coil motor in a linear mode and in a pulse width modulation. The bridge circuit is driven by a PWM converter coupled to one of said two control inputs and by a linear amplifier coupled to the other of said two control inputs.

Abstract: A voltage regulator having an output terminal adapted to being connected to a load, including a device for limiting the current flowing through the load to a first threshold current if the voltage of the output terminal is lower than a threshold voltage, and to a second current threshold higher than the first current threshold if the voltage of the output terminal is greater than the threshold voltage.

Abstract: The present invention provides a voltage supplying device which supplies a voltage to a load capacitance to finish charging the load capacitance with a predetermined voltage within a predetermined charging period. The voltage supplying device includes a voltage supplying source, an impedance conversion circuit which performs impedance conversion for a voltage from the voltage supplying source and outputs the converted voltage, a first switching element connected between the impedance conversion circuit and the load capacitance, a bypass line for bypassing the impedance conversion circuit and the first switching element and supplying a voltage from the voltage supplying source to the load capacitance, and a second switching element provided on the bypass line.

Abstract: A regulated voltage supply circuit having improved power supply rejection ratio is achieved. The circuit comprises, first, a voltage follower having an input, an output, and a power supply voltage. The input is coupled to a reference voltage. The output comprises the regulated voltage supply. Second, a means of compensating noise on the power supply voltage comprises phase shifting the power supply voltage 180 degrees and feeding back the phase shifted power supply voltage to the voltage follower input to thereby improve power supply rejection ratio. The means of compensating noise may comprise an adjustable gain. This adjustable gain may further comprise an adjustable value resistance. The adjustable gain is used in a to optimize the PSRR by testing comprising modulating noise on the power supply voltage, measuring the noise on the regulated voltage supply, and adjusting the gain.

Abstract: A high power supply ripple rejection (PSRR) internally compensated low drop-out voltage regulator using an output NMOS pass device. The voltage regulator uses an inverting inter-stage variable gain amplifier to adjust its gain in response to a load current passing through the output NMOS device such that as the load current decreases, the gain increases, wherein a second pole associated with the voltage regulator is pushed above a unity gain frequency associated with the voltage regulator. The inverting inter-stage variable gain amplifier is further operational to adjust its gain in response to a load current passing through the power NMOS device such that as the load current increases, the gain decreases, wherein the unity gain bandwidth associated with the loop formed by a compensation capacitor is kept substantially constant.

Abstract: An apparatus and method is related to a shunt regulator that includes two feedback control loops. The shunt regulator provides a charging current to a battery cell from a power source. The input voltage from the power source is limited by the first feedback control loop to ensure that the input voltage does not exceed the breakdown voltage of the shunt regulator. The output voltage from the shunt regulator is limited by the second feedback control loop to ensure that the output voltage does not exceed the maximum rated voltage of the battery. The dual feedback control loops provide maximum charging current to the battery, while protecting the shunt regulator and the battery from damage. The shunt regulator is suitable for implementation in an integrated circuit.

Abstract: A low drop-out voltage regulator uses a voltage subtractor circuit 36 to form a power supply rejection boost circuit. The voltage subtractor 36 is inserted between the pass element 20 and the amplifier 26 of the low drop-out regulator. The voltage regulator circuit includes a pass element 20 coupled between an input node and an output node; a voltage feedback circuit 28 and 30 coupled to the output node Vo; an amplifier 26 having an input coupled to the voltage feedback circuit; and a voltage subtractor 36 having a control node coupled to an output of the amplifier 26, an output coupled to a control node of the pass element 20, and an input coupled to the input node. The boost circuit improves supply noise rejection performance significantly without adding much complexity to the regulator system. The boost circuit is simple and consumes negligible silicon area and power.

Abstract: A high power supply ripple rejection (PSRR) internally compensated low drop-out voltage regulator using an output NMOS pass device. The voltage regulator uses an inverting inter-stage variable gain amplifier to adjust its gain in response to a load current passing through the output NMOS device such that as the load current decreases, the gain increases, wherein a second pole associated with the voltage regulator is pushed above a unity gain frequency associated with the voltage regulator. The inverting inter-stage variable gain amplifier is further operational to adjust its gain in response to a load current passing through the power NMOS device such that as the load current increases, the gain decreases, wherein the unity gain bandwidth associated with the loop formed by a compensation capacitor is kept substantially constant.

Abstract: A system and method for remote regulation of a switching power converter operating relative to a second ground is disclosed where a control signal is produced by comparing the line voltage relative to a first ground with a reference voltage relative to the first ground to produce a first error signal relative to the first ground, translating the first error signal to a second error signal relative to a second ground, and applying the second error signal to the switching power converter to thereby regulate the switching power converter as a function of the line voltage.

Abstract: A voltage regulator includes a power transistor for providing an electrical current to a load circuit connected to an output of the regulator. The delivered current is limited by a limitation circuit within the regulator. A stabilization resistor is connected between the power transistor and the output of the regulator. The limitation circuit includes a fixed-voltage generator, and a comparator for comparing the voltage generated in the stabilization resistor by the output current of the regulator with the fixed voltage. The output of the comparator controls an adjustment transistor that limits the current delivered by the power transistor.

Abstract: A low dropout voltage regulator with non-Miller frequency compensation is provided. The LDO circuit has two wide-band, low-power cascaded operational transconductance amplifiers (OTAs): an error amplifier and a unity-gain-configured voltage follower. The unity-gain-configured voltage follower drives a gate of a power PMOS path transistor with a high parasitic gate capacitance. The wide-band, low-power OTAs enable the use of a single, low-value, external compensation capacitor with a low equivalent series resistance (ESR). An on-chip-compensation capacitor is connected in parallel with the upper resistor of a feedback network, which introduces a zero-pole pair that enhances the phase margin close to unity-loop-gain frequency.

Abstract: A high-speed current mirror and correction circuitry are provided to minimize current errors in short-channel MOS switched current mirrors. The current mirror supplies high current levels at high modulation speeds, while simultaneously exhibiting good output voltage compliance. The correction circuitry includes a buffer amplifier, current shaping circuit, and replica mirror section. The current shaping circuit is able to supply a differential reference current, to correct load current errors, in response to the replica mirror section matching the buffered load voltage.

Abstract: To provide a voltage regulator capable of securely being turned off even if the regulator is used under a high temperature and an impedance of an external load is large. A voltage regulator is provided, which includes a voltage divider circuit that can divide a potential difference between an output voltage terminal and a reference terminal, wherein when the voltage divider circuit inputs an on signal, the voltage divider circuit outputs a constant voltage between the output voltage terminal and the reference terminal, and wherein when the voltage divider circuit inputs an OFF signal, the voltage divider circuit can reduce the impedance thereof.

Abstract: There is provided a voltage regulator in which a ratio of a maximum current and a short circuit current is adjusted so that the maximum current is greatly increased and a short circuit current is made small. A first current limiting circuit for limiting a current value of an output voltage terminal is composed of P-channel MOS transistors (2, 4), an N-channel MOS transistor (3), and resistors (21 and 22). A second current limiting circuit for detecting a reduction in voltage of the output voltage terminal and limiting a current value of the output voltage terminal is composed of P-channel MOS transistors (2, 4), an N-channel MOS transistor (3), and resistors (20, 21, and 22). By using these circuits, the maximum current can be greatly increased and the short circuit current can be reduced.

Abstract: A voltage regulator includes a power transistor for providing an electrical current to a load circuit connected to an output of the regulator. The delivered current is limited by a limitation circuit within the regulator. A stabilization resistor is connected between the power transistor and the output of the regulator. The limitation circuit includes a fixed-voltage generator, and a comparator for comparing the voltage generated in the stabilization resistor by the output current of the regulator with the fixed voltage. The output of the comparator controls an adjustment transistor that limits the current delivered by the power transistor.

Abstract: In a voltage converter, a voltage-controlled switching device of a power stage receives a control signal and operates accordingly at a switch-ON mode, where the control signal is a high-level signal, and a switch-OFF mode, where the control signal is a low-level signal. A comparator compares a trigger signal and an input signal associated with an output signal outputted by the power stage, and outputs the control signal, wherein the control signal is the high-level signal when the trigger signal is greater than the input signal, and wherein the control signal is the low-level signal when the trigger signal is less than the input signal. A trigger circuit receives a reference voltage and the control signal, and supplies the trigger signal to enable the comparator to output a periodic pulse signal that serves as the control signal such that the voltage-controlled switch device is activated periodically.

Abstract: The low dropout voltage regulator (LDO) circuit with improved power supply rejection ratio includes: a first amplifier 20 having a first input coupled to a reference voltage node Vref; a second amplifier 22 having an input coupled to an output of the first amplifier 20; a pass transistor 24 having a control node coupled to an output of the second amplifier 22; a feedback circuit 26 and 28 having an input coupled to the pass transistor 24 and an output coupled to a second input of the first amplifier 20; an inverting gain stage 36 coupled to the input of the second amplifier 22; and a high pass filter 42, 44, and 38 coupled between a power supply node and a control node of the inverting gain stage 36. The circuit uses the high pass filter 42, 44, and 38 and inverting gain stage 36 to feedforward the power supply ripple into the LDO's control loop which counter-acts the impact of the supply ripple on the output node Vo.

Abstract: A linear regulator circuit includes an input terminal for receiving an input voltage and an output terminal for providing an output voltage. A pass device, coupled to the input terminal and the output terminal, generates an output current. A feedback circuit is coupled to the pass device and the output terminal. The feedback circuit increases the output voltage as the output current decreases and decreases the output voltage as the output current increases.

Abstract: A linear regulator includes an amplifier that provides a control signal in response to a comparison between a feedback signal and an output signal. A pass element in the regulator selectively couples power from an unregulated power signal to an output node in response to the control signal. A compensation circuit that includes negative gain is arranged to provide the feedback signal in response to an output signal at the output node. In one example, the compensation circuit includes an inverting amplifier that provides an intermediary signal in response to the output signal, and the intermediary signal is coupled to a feedback network that provides the feedback signal. In another example, the compensation circuit includes an inverting amplifier that cooperates with a feedback network to provide the feedback signal. The closed-loop transfer functions of the compensation circuits provide a feed-forward zero that enables stable operation of the LDO regulator.

Abstract: A single-cycle response pulse width modulator comprising a single error integrating amplifier. The error integrator output is compared to zero to set a flip-flop. A linear ramp voltage is compared to the reference voltage to reset the flip-flop. The linear ramp voltage is generated by a voltage-controlled current source coupled to the supply voltage and charging a capacitor. The flip-flop when reset discharges the capacitor. Corrective circuits compensate for delay times in components to maintain substantially constant switching frequency and low distortion in the output voltage. The controller is capable of outputting a predictive triggering signal for associated class-N amplifiers.

Abstract: A low dropout voltage regulator with non-Miller frequency compensation is provided. The LDO circuit has two wide-band, low-power cascaded operational transconductance amplifiers (OTAs): an error amplifier and a unity-gain-configured voltage follower. The unity-gain-configured voltage follower drives a gate of a power PMOS path transistor with a high parasitic gate capacitance. The wide-band, low-power OTAs enable the use of a single, low-value load capacitor with a low equivalent series resistance (ESR). A frequency compensation capacitor is connected in parallel with the upper resistor of a feedback network, which introduces a zero-pole pair that enhances the phase margin close to unity-loop-gain frequency.

Abstract: An apparatus for controlling start up of supply voltages received from a power supply responding to control by a feedback signal includes: (a) first error amplifiers receiving a supply voltage at a first terminal, receiving a reference voltage at a second terminal and providing a first error signal to a switch indicating difference between the signals at the terminals; and (b) second error amplifiers having a first node coupled with the switch and for receiving the supply voltage and a second node receiving a reference voltage; the first node receives a sum of the first error signal and the supply voltage when the switch is in a first orientation, and receives the supply voltage when the switch is in a second orientation; each second error amplifier provides a second error signal indicating a difference between signals received at the nodes that is the feedback signal for controlling the power supply.

Abstract: The current source can be switched between a current-controlled mode and a voltage-controlled mode. A special type of drive to the current source has the result that it operates correctly and in a stable manner under all circumstances with only two input connections.

Abstract: An amplifier, for use in regulator circuits and other applications, having dynamic input stage biasing includes an input stage operatively coupled to an input of the amplifier. A controlled current source coupled to the input stage is responsive to a control signal for at least partially controlling an input bias current generated by the controlled current source. The amplifier further includes a sense circuit operatively connected in a feedback arrangement between an output of the amplifier and the controlled current source. The sense circuit measures an output load current from the amplifier and generates the control signal in response thereto, whereby the input bias current is a function of the output load current of the amplifier. In this manner, parasitic poles associated with the amplifier are pushed out in frequency so as to provide superior amplifier stability while dissipating low quiescent current, particularly at low output load current levels.

Abstract: A power converter having a remote sensing system. The power converter includes a high-pass feedback signal, a remote sensing low-pass signal, a constant-sum filter combining the high-pass feedback signal and the remote sensing low-pass signal. The constant-sum filter is at least a second order filter and generates an error signal. The constant-sum filter is a three terminal low-pass filter and an input terminal, an output terminal, and a common terminal. The input terminal receives the remote sensing low-pass signal. The common terminal receives the high-pass feedback signal. The output terminal transmits the feedback control signal.

Abstract: Current source comprising a MOS transistor (T1) having a first terminal (D) connected to a high voltage input (HV), a second terminal (S) providing an output current (Iout) to a current output terminal (Q), and a gate, the current source further including a bias unit (T2) connected to the high voltage input (HV) for generating a small bias current for the gate (G), the gate (G) further being connected to an output (Q1) of a voltage comparator (A1) for comparing a sensed voltage (Vsense) caused by the output current (Iout) over a voltage sensor means (Rsense) with a reference voltage and providing at said comparator output (Q1) a regulation voltage for the gate (G) based on the difference between the sensed voltage and the reference voltage, wherein the bias unit (T2) includes a transistor (T2) having a gate electrode (g) which is coupled to one of the nodes of the voltage sensor (Rsense).

Abstract: A circuit and method for providing a regulated output voltage is described. The circuit includes a capacitor array, a comparator and an output control module. The capacitor array receives an input voltage, first and second control signals, and generates a regulated output voltage in response. The comparator compares the regulated output voltage and a reference voltage, and generates a comparator signal in response. The output control module receives the comparator signal and the first control signal. In response, the output control module provides the second control signal to the capacitor array.

Abstract: A voltage-controlled current source provides operation as either a differential current source for a floating load, or operation as a grounded current source when one end of the load is grounded. Switching between operation as a differential current source and operation as a grounded current source is automatic, and will accommodate significant lead resistance between the source and the load. Additionally, in absence of a grounded load the circuit can provide active common mode reduction using active feedback to reduce common mode voltage on the load.

Abstract: A voltage regulator includes a regulation MOS transistor and an amplifier providing an output for driving a gate of the regulation MOS transistor. The amplifier drives the gate based upon a difference between a reference voltage and a feedback voltage. The voltage regulator may further include a circuit for making the amplifier switch to a standby mode with low current consumption when the difference between the supply voltage and the output voltage of the regulator is below a first threshold. This is done while maintaining, at the gate of the regulation transistor, a voltage that keeps the regulation transistor on. The present invention is particularly applicable to the management of power supplies in portable telephones.

Abstract: A power supply circuit is equipped with a first amplification path 10 in which a first potential is input and that supplies current to an output terminal when a control signal is in a first state; a second amplification path 20 in which a second potential is input and that absorbs current from the output terminal when a control signal is in a second state; an intermediate potential forming circuit that forms a third potential between the first potential and the second potential; and a comparison circuit 30 that compares the third potential with a potential at the output terminal to form a control signal and supplies the same to the first and second amplification paths.

Abstract: An amplifier, for use in regulator circuits and other applications, having dynamic input stage biasing includes an input stage operatively coupled to an input of the amplifier. A controlled current source coupled to the input stage is responsive to a control signal for at least partially controlling an input bias current generated by the controlled current source. The amplifier further includes a sense circuit operatively connected in a feedback arrangement between an output of the amplifier and the controlled current source. The sense circuit measures an output load current from the amplifier and generates the control signal in response thereto, whereby the input bias current is a function of the output load current of the amplifier. In this manner, parasitic poles associated with the amplifier are pushed out in frequency so as to provide superior amplifier stability while dissipating low quiescent current, particularly at low output load current levels.

Abstract: A stabilized DC power supply device that maintains an output voltage thereof at a constant level despite a fluctuation arising in a power supply voltage fed thereto comprises a control circuit that compares the output voltage with a reference voltage so as to output a control signal by which the output voltage is maintained at a predetermined level, and a ripple cancellation circuit that amplifies an undulating component included in the power supply voltage at a predetermined gain and that feeds out a resulting signal as an undulation compensation signal for correcting the output voltage, wherein the undulation compensation signal for correcting the output voltage is superimposed on the reference voltage so as to prevent an undulation arising in the power supply voltage from appearing in the output voltage.

Abstract: A low dropout voltage regulator includes: a first amplifier A1 having a reference voltage node VREF coupled to a first input; a second amplifier A2 having an input coupled to an output of the first amplifier A1; a variable bias current source I1 coupled to the first amplifier A1 and having a control node coupled to an output of the second amplifier A2; a power switch M1 having a control node coupled to the output of the second amplifier A2 and having a first end coupled to a source voltage node VDD; and a feedback circuit R1 and R2 having an input coupled to a second end of the power switch M1 and an output coupled to a second input of the first amplifier A1. The best node in the system that detects the load current level is the output of the second amplifier A2. This signal is used to modulate the bias current I1 of the first amplifier A1 by increasing the bias current when the load current increases and vice versa, which consequently modulates the transconductance of amplifier A1.

Abstract: A voltage supplying device comprises a digital-analogue converter (DAC) and an impedance conversion circuit for performing the impedance conversion for a voltage from the DAC and outputting the converted voltage. A first switching element is provided between the output of the impedance conversion circuit and the load capacitance. A bypass line is provided for supplying a voltage from the DAC to the load capacitance bypassing the impedance conversion circuit and the first switching element, and a second switching element is provided on the bypass line. The impedance conversion circuit comprises a voltage follower circuit and a booster, which is connected to the output stage of the voltage follower circuit. In the first period and the second period of the charging period, the first switching element is turned on, and the second switching element is turned off, whereby the output of the impedance conversion circuit is supplied to the load capacitance.

Abstract: A constant voltage source includes a constant voltage supplying circuit including an operational amplifier for supplying an output voltage to a load and a feedback circuit for feeding back the output voltage to the operational amplifier; a first inductance unit disposed between the constant voltage supplying circuit and the load; and a first bypass capacitor of which one terminal is coupled between the first inductance unit and the load and the other terminal is coupled to a constant voltage unit.

Abstract: A voltage regulator having an output terminal provided for being connected to a load, including an amplifier having its inverting input connected to a reference voltage, and its non-inverting input connected to the output terminal, a charge capacitor arranged between the output terminal and a first supply voltage, first and second voltage-controlled switches each arranged to connect a second supply voltage and the output terminal, and a control means adapted to providing a voltage depending on the output voltage of the amplifier, on the one hand, to the gate of the first switch and, on the other hand, when the current flowing through the first switch reaches a predetermined threshold, to the gate of the second switch.

Abstract: A high-accuracy linear amplifier is disclosed for sinking or sourcing current to or from a load. The linear amplifier includes input circuitry for receiving a predetermined input signal and rectifier circuitry. The rectifier circuitry is disposed at the output of the input circuitry and is operative in response to the input signal to generate a source/sink command signal. Output stage circuitry is coupled to the rectifier circuitry and includes a current sink transistor and a current source transistor. The output stage circuitry is responsive to the command signal to sink or source current through one of the respective transistors. The amplifier further includes feedback circuitry coupled between the output of the output stage circuitry and the input circuitry to provide an error signal for modifying the input signal. Bias circuitry maintains the non-conducting transistor in an on state during the sourcing or sinking of current.

Abstract: A high-accuracy linear amplifier is disclosed for sinking or sourcing current to or from a load. The linear amplifier includes input circuitry for receiving a predetermined input signal and rectifier circuitry. The rectifier circuitry is disposed at the output of the input circuitry and is operative in response to the input signal to generate a source/sink command signal. Output stage circuitry is coupled to the rectifier circuitry and includes a current sink transistor and a current source transistor. The output stage circuitry is responsive to the command signal to sink or source current through one of the respective transistors. The amplifier further includes feedback circuitry coupled between the output of the output stage circuitry and the input circuitry to provide an error signal for modifying the input signal. Bias circuitry maintains the non-conducting transistor in an on state during the sourcing or sinking of current.

Abstract: A linear regulator of the type including a power MOS transistor of a first channel type, controlled by an amplifier having an output stage including, between two supply terminals, a resistor and a first MOS control transistor of a second channel type. The regulator further includes a start-up circuit having a switchable resistor in parallel on said first resistor.

Abstract: A circuit for generating an output voltage proportional to temperature with a required gradient, the circuit including a first stage arranged to generate a first voltage which is proportional to temperature with a predetermined gradient, the first stage including first and second bipolar transistors with different emitter areas having their emitters connected together and their bases connected across a bridge resistive element, wherein the collectors of the transistors are connected to an internal supply line via respective matched resistive elements as the voltage across the bridge resistive element is proportional to temperature; a differential amplifier having its input connected respectively to the collectors, and its output connected to stabilisation circuitry connected between first and second power supply rails and an internal supply line which cooperates with the differential amplifier to maintain a stable voltage on the internal supply line despite variations between the first and second power supply

Abstract: A power circuit having an output stage which includes voltage followers. The power circuit comprises first and second switching elements, respectively, connected between two voltage sources. A first comparator is provided to compare an input voltage with the output voltage of a voltage follower associated with the input voltage, and turn on the first switching element if the output voltage exceeds the input voltage. In addition, a second comparator is provided to compare the output voltage with a reference voltage to turn on the second switching element if the output voltage becomes lower than the reference voltage. A reference voltage circuit changes the value of the reference voltage depending on the output of the second comparator.

Abstract: A regulator is provided with circtuiry for restraining a variation in a frequency band and to provide a transient response characteristic which does not depend upon load current. A load current detecting transistor is connected in parallel with an output driver transistor of the regulator to detect load current. The ON resistance of a transistor of a phase compensation RC network is varied in accordance with current variations detected by the load current detecting transistor. As a result, a frequency of a zero point for phase compenstation of the RC network is varied so that the frequency band of the regulator does not vary with load current and the transient response characteristic of the regulator is improved.

Abstract: A single-cycle response pulse width modulator comprising a single error integrating amplifier. The error integrator output is compared to zero to set a flip-flop. A ramp voltage is compared to the reference voltage to reset the flip-flop. The ramp voltage is generated by a resistor connected to the supply voltage and charging a capacitor. The flip-flop when reset discharges the capacitor. Corrective circuits compensate for delay times in components to maintain substantially constant switching frequency and low distortion in the output voltage. A predictive triggering circuit puts out a signal for predetermined sequencing of events.

Abstract: A linear regulator capable of sinking current. The linear regulator has an output terminal, providing the next stage with an output voltage. The next stage may feed the linear regulator with current. The linear regulator includes a first transistor, a first amplifier, a second transistor, and a second amplifier. When the output voltage at the output terminal is greater than a certain value, the second transistor conducts and sinks the current from the next stage. The linear regulator according to the invention can handle the problem of the feeding current from the next stage, making the output voltage under the restricted range of the linear regulator.