Abstract: An output driver is provided with driving and filtering capability. An output current driver and output voltage driver embodiments are provided. The output current driver includes, an operational amplifier having a first input for receiving a first input voltage V.sub.1, a second input for receiving a second input voltage V.sub.2, and an output for generating an output voltage Vc. The output current driver also includes a transistor having an input terminal coupled to the output of the operational amplifier for receiving the output voltage Vc, a first terminal coupled to a differential pair, and a second terminal coupled to the second input of the operational amplifier, wherein an output current I.sub.out flows across the transistor. A control current I.sub.CONTROL determines a value of the first input voltage V.sub.1, while the output voltage Vc controls the transistor so that the second voltage V.sub.2 becomes equal to the first voltage V.sub.1.

Abstract: A power source circuit for a flash memory includes a positive circuit section for generating a positive voltage source, a source follower transistor for converting the impedance of the first voltage source, a negative circuit section for generating a negative voltage source while maintaining a voltage difference between the output of the source follower transistor and the negative voltage source at a first reference potential. The positive circuit section includes a voltage compensating transistor having a threshold voltage equal to the threshold of the source follower transistor.

Abstract: The present invention relates to a voltage regulator including at least one input terminal for receiving a supply voltage; a circuit for generating a reference voltage proportional to a desired regulated output voltage; an amplifier of a signal of error between the reference voltage and the output voltage assigned with a coefficient of proportionality; a capacitor connected between an output terminal and the ground, further including means for supplying at least the circuit and the amplifier with the output voltage in case of a deficiency or a disappearing of the supply voltage present on the input terminal.

Abstract: A precision voltage regulator comprises a three terminal regulator coupled to a voltage divider. The voltage divider has two composite resistors, each of which comprises a plurality of matched value resistors fabricated on a common substrate, mixed in series and parallel configurations. The resultant voltage divider produces a wide range of divider ratios, while preserving a divider ratio which is independent of temperature and tolerance effects.

Abstract: A voltage control system that provides an output voltage of constant value to a load. The control system includes voltage supply means for providing the output voltage to the load. A feedback circuit supplies a feedback current. A summing circuit algebraically sums the feedback current and a reference current to provide an error signal that changes as the feedback current changes. These changes affect the amplitude of the output voltage delivered to the load. The error signal is processed by a voltage adjustment means including an error amplifier that amplifies the error signal for use in making an adjustment to the output voltage so as to maintain its constant value. A gain increasing means responds to transient changes in output voltage to momentarily increase the error amplifier gain to shorten system recovery time to constant output voltage.

Abstract: A stable voltage regulator circuit of simple circuit configuration 174,222 includes a differential amplifier (M2, M3) which is powered from a supply line (1) at a nominal voltage level (Vin), by being coupled between the supply line and a return line (2). A reference device (M1) is coupled to a first input (4) of the differential amplifier (M2, M3) for defining a desired output voltage (Vca) on an output line (3) coupled to an output (6) of the differential amplifier (M2, M3). The differential amplifier (M2, M3) is coupled to the return line (2) by a varying current source (M4) which feeds a varying bias current to the differential amplifier (M2, M3) and which is controlled from the supply line (1) in accordance with variations in the nominal voltage level (Vin) on the supply line (1). The varying bias current to the differential amplifier (M2, M3) provides a first-order compensation of the output voltage (Vca) for these voltage variations on the supply line (1).

Abstract: There is provided a voltage regulator capable of lowering a voltage applied across a phase compensating capacitor even at the time of a high voltage output and of reducing an area of the phase compensating capacitor by forming it with a thin insulating film. Phase compensating circuit 61 included in the voltage regulator comprises phase compensating capacitor C1, P-channel MOS transistor P1, N-channel MOS transistor N2 and voltage generating circuit 71 for generating a constant voltage. When gate-source voltages of P-channel MOS transistor P1 and N-channel MOS transistor N2 are Vgs(N2) and Vgs(P1), respectively, a voltage applied across capacitor C1 becomes Vgs(N2)+Vgs(P1) regardless of an input voltage applied to input terminal 1, and is suppressed to low.

Abstract: An improved low-dropout ("LDO") voltage regulator incorporates a transient response boost circuit which is added to the slew-rate limited node at the control terminal of the LDO voltage regulator output transistor and provides improved transient response performance to the application of various load current step stimuli while requiring no standby or quiescent current during zero output current load conditions. The transient boost circuit supplies current to the slew-rate limited node only upon demand and may be constructed as either a localized positive feedback loop or a number of switching devices which conduct current only during slew-rate conditions.

Abstract: A power supply with a programmable voltage slew rate is disclosed for generating a regulated voltage at a predetermined set-point. The power supply includes a programmable current source for generating a controllable level of current flow and a capacitive element coupled to the current source. The capacitive element is responsive to the current flow to establish a reference voltage that varies linearly with respect to variations in the current flow. The power supply additionally includes a power device having a control element disposed in sensed communication with the reference voltage and an output for driving a load. The output is operative to generate an output voltage following that of the reference voltage.

Abstract: The active capacitor regulating type controllable voltage and current power supply circuit is disclosed with a voltage reducing and current limiting rectifying circuit which is constituted by capacitors and a bridge type current rectifier device, wherein it is characterized in that the output terminals of the rectifying circuit are parallel installed with a current distributing circuit device, thereby to actively control the output voltage setting status.

Abstract: A device for controlling a current to a load by means of mirroring is described. Two transistor units are connected to a common reference point. By driving a current through one of the transistor units, a corresponding current is generated in the second transistor unit. A control unit, connected between the transistors can regulate a voltage difference between transistors. Accordingly, the size of the load attached is determined through mirroring with accuracy and minimal power loss.

Abstract: A DC power supply having a pair of "piggybacked" voltage supplies, where a reference voltage supply provides a reference voltage for a variable voltage supply and each voltage supply is coupled to a current sink. The power supply is capable of sourcing and sinking current through a single output terminal when supplying a positive or negative output voltage with respect to ground.

Abstract: A voltage regulator circuit having a series device external to an integrated circuit voltage regulator. The external series device provides a voltage drop prior to the voltage being input to the voltage regulator during high power applications. Depending on the power level, low or high, one of two transistors will be activated. For low power applications, a transistor attached directly to the input voltage is active and the external series device is bypassed. For high power applications, the external series device provides a voltage drop prior to the input voltage reaching the second transistor thereby lowering the power to be dissipated by the integrated circuit.

Abstract: The present invention disclosed a method of reading a flash memory cell and a read voltage generating circuit which can perform a stable read operation regardless of a power supply voltage by applying a voltage of 2V to the source, a voltage of 0V to the drain, a power supply voltage Vcc to the select gate, and a clamping voltage output from the read voltage generating circuit to the control gate upon a read operation of a split gate flash memory cell.

Abstract: A method and apparatus for automatically controlling integrated circuit supply voltages includes, according to one embodiment, a primary voltage regulator and a secondary voltage regulator. The primary voltage regulator supplies one of either a first voltage or a second voltage to a first plurality of inputs of an integrated circuit. The secondary voltage regulator conditionally supplies a third voltage to a second plurality of inputs of the integrated circuit in the event the primary voltage regulator supplies the first voltage, with the third voltage being substantially the same as the second voltage.

Abstract: Two parallel regulator stages, each comprising a transistor (T1, T2, respectively), are provided. The transistor (T2) forms part of the indirect parallel regulator stage and acts directly on the rectifier. It is capable of taking up comparatively large currents and hence is comparatively slow. The transistor (T1) forms part of the direct regulator stage and operates in parallel with the sustaining capacitor. Because of the coarse control provided by the transistor (T2), it need take up small currents only and can hence have a very fast control behavior. Because of the coarse control by the transistor (T2), the alternating voltage on the antenna terminals (LA and LB) quickly breaks down when the RF signal is interrupted; consequently, the transmission rate can be increased in the case of pause interval modulation. Static discharges are also dissipated by the transistor (T2), so that no additional protective circuitry is required for this purpose.

Abstract: A voltage reference generator includes a voltage source and a differential amplifier. The voltage source supplies a stable voltage reference to a positive input of the differential amplifier which is configured as a follower having its output looped back to its negative input. The negative feedback loop is a variable-resistance loop that is controlled by the output of the differential amplifier. The variable-resistance feedback loop transiently imposes open-loop operation when the voltage reference generator is turned on so as to provide high current to the output before imposing closed-loop operation in follower mode.

Abstract: A determinate power source control for an integrated circuit (10) includes a variable voltage regulator (16), which is operable to receive a supply voltage on the input thereof and output a regulated voltage for input to the integrated circuit (10). A voltage adjustment circuit (22) is operable to generate a voltage adjustment value V.sub.ADJ for input to the voltage regulator (16) to determine the voltage output thereby. In a determinate operating mode, the voltage adjustment circuit (22) varies the V.sub.ADJ value to cause the regulator (16) to vary the regulated output voltage to the integrated circuit (10). For each value, the operating speed of the integrated circuit (10) is determined and this information stored in a table (24). Thereafter, the voltage adjustment circuit (22) is placed in an operating mode wherein the voltage adjustment value associated with the optimum operating speeds of the integrated circuit (10) is selected and input to the voltage regulator (16).

Abstract: A circuit regulates a voltage by controlling a voltage generator. A voltage divider is coupled between the regulated voltage and a supply voltage, and generates a sense voltage. A clamp circuit is coupled to the divider, and reduces the sensitivity between the supply voltage and the regulated voltage by substantially prohibiting the voltage across itself from exceeding a predetermined value A detector circuit is coupled between the divider and the voltage generator, and provides a control signal that deactivates the generator when the sense voltage reaches a first predetermined threshold, and activates the generator when the sense voltage reaches a second predetermined threshold.

Abstract: A storage capacitor of a hold-up circuit is connected by a resistor to the urrent conducting bus supplying operating voltage to computer hardware from a power source. The capacitor is thereby charged to the operating voltage level in order to subsequently maintain computer operation by discharge through a diode during power interruption of a relatively long duration determined by the capacitor charge and a predetermined drop in voltage applied to the computer load causing its shutdown. Detection of such drop in voltage is operative through an opto-isolator to safely discharge the capacitor by relay controlled grounding thereof.

Abstract: An about constant brightness level of light output is produced from portable battery operated incandescent light sources, such as flashlights, emergency lights and lanterns, throughout the full discharge and terminal voltage decay of the electrochemical charge life of a set of batteries. Instant levels of power flow between the battery and the light source's incandescent bulb are dynamically controlled. When the battery is fresh a reduced portion of the available battery power flows to the light bulb. As at least a portion of the battery wears-down, and charge decreases, the remaining portion of the battery power flow increases thereby keeping the light bulb's filament operating near optimal efficiency and with visually desirable "white-light" brightness. A further advantage is that fewer changes of dry-cell battery sets are needed in order to maintain the light source near peak performance.

Abstract: An information processing device, such as a notebook computer, having a plurality of subsystems requiring power input, is provided with a switching regulator for supplying power to these various subsystems. The switching regulator is controlled by a feedback voltage which is selected to be a minimum value from amongst the various power lines present.

Abstract: A method and apparatus for automatically controlling integrated circuit supply voltages includes, according to one embodiment, a primary voltage regulator and a secondary voltage regulator. The primary voltage regulator supplies one of either a first voltage or a second voltage to a first plurality of inputs of an integrated circuit. The secondary voltage regulator conditionally supplies a third voltage to a second plurality of inputs of the integrated circuit in the event the primary voltage regulator supplies the first voltage, with the third voltage being substantially the same as the second voltage.

Abstract: Internal supply voltage generating circuits generate internal supply voltages at voltage levels below an external supply voltage. The internal supply voltages operate peripheral circuits and array circuits. A reference voltage generates a constant reference voltage. First and second dividing circuits output a given voltage in response to the internal supply voltage. First and second differential amplifiers compare the reference voltage with each of the output voltages from the first and second dividing circuits. First and second driving circuits supply the internal supply voltage from the external supply voltage. First and second voltage boosting circuits clamp output voltage levels for the first and second driving circuits from the external supply voltage and raise the clamped output voltage level of the first driving circuit higher than the clamped output voltage level of the second driving circuit.

Abstract: The present invention provides a voltage regulator especially adaptable for use with a field-programmable gate array (FPGA). The voltage regulator of the present invention rapidly generates an operating voltage for the core or nucleus logic elements upon application of external power while preventing degradation of the fuses. The core or regulated voltage of a FPGA can be set to a level that provides maximum performance with minimum power consumption or, alternatively, permits propagation delays and switching rates to be adjusted so as to compensate for die to die variation. Since it is common for electrical parameters of FPGA manufactured in different wafer fabrication facilities to vary, the voltage regulator is configurable as a true voltage regulator or, alternatively, as a pseudo-voltage regulator. The voltage regulator comprises an operational transconductance amplifier with a single gain stage followed by an NMOS source follower.

Abstract: The invention relates to a method to reduce the power consumption of an electronic device comprising at least one voltage regulator. At least one of the regulators (REG1-REG4) is switched off and on according to a predetermined duty cycle during such periods when the electronic device does not require the normal power supply ability of the regulator. This may be realized e.g. in a mobile phone during two successive control channel messages received from a base station when the mobile phone is in a so called power saving mode.

Abstract: A method of improving the performance of an active semiconductor device with a voltage-controllable channel length, comprises providing a matched reference component having similar operating characteristics to the active semiconductor device, continually monitoring the breakdown voltage of the matched reference component, and maintaining the operating voltage of the active semiconductor device to lie just below the measured breakdown voltage of the matched reference component. In this way, the performance of the active component can be optimized.

Abstract: A bandgap voltage reference circuit employs a Vbe voltage multiplier network in a feedback line of an output amplifier of the bandgap reference circuit, thus permitting to independently fix the output voltage that is produced and the temperature coefficient thereof. A voltage reference having a linear negative temperature coefficient in an extended temperature variation range may be obtained, starting from a bandgap reference voltage with a positive temperature coefficient.

Abstract: The voltage regulator circuit contains a MOS transistor 12 connected between a voltage supply line 22 and an output line 30. The MOS transistor 12 provides a stable voltage on the output line 30 independent of voltage transients on the voltage supply line 22 and independent of current transients on the output line 30. An amplifier 14 coupled to the MOS transistor 12 controls the response of the MOS transistor 12. Feedback circuitry connected between the output line 30 and the amplifier 14 provides feedback to the amplifier 14. A voltage source 16 provides the reference for amplifier 14.

Abstract: The invention provides a voltage-generating circuit in which the characteristic of the output voltage in response to the ambient temperature is represented by a predetermined line. A temperature sensor outputs a voltage in proportion to the ambient temperature, and the voltage is inversely amplified by an operational amplifier. An optimum operating voltage V.sub.op for a liquid crystal is output from an output terminal of a variable voltage regulator, in response to the voltage output ted from the operational amplifier.

Abstract: A circuit arrangement for automatically decreasing the load current includes a series arrangement formed by a load and a first electronic switching device and connected to a DC source of power. The first switching device is driven by a driver. The circuit further includes a control circuit controlling the driver. The control circuit is adapted to be initiated by a second electronic switching device, so that the second electronic switching device connects the first terminal of a capacitor and of a first resistor as well as the base of a transistor to one pole of the DC source of power, with the main current path of the transistor being between the input of the driver and the other pole of the DC source of power. The second terminal of the capacitor and of the first resistor is coupled to the other pole of the DC source, and the end of the first electronic switching device connected to the load is coupled to the second terminal of the capacitor through a feedback resistor.

Abstract: An automatic regulating circuit gradually regulates an output voltage to a reference value in synchronism with a clock signal, and has a binary search controller changing the value of a control signal across a final value corresponding to said reference value until a convergence at the final value; the control signal is supplied to a level shifting system so as to converge the output voltage at the reference value, and the automatic regulating circuit quickly completes the voltage regulation.

Abstract: A voltage regulator for use in controllable bus terminators providing a source and a sink to a regulated output without clamping circuitry is disclosed. The regulator maintains a voltage at a node by sourcing current into the node when a cable line sinks current from the node and sinking current from the node when a cable line sources current into the node. By avoiding the use of clamping circuitry, a voltage deadband between the regulator output voltage and the clamp circuit voltage is avoided.

Abstract: Circuit arrangement for generating a constant output voltage (U2), having a decoupling diode (17) of the output side and having an arrangement (20) for actual value formation that is connected to the output of the circuit arrangement. In order, given high precision of the output voltage (U2), to prevent voltages, that occur at the user (26) and are applied to the user (26) from elsewhere, from causing the regulator to inhibit the circuit arrangement, the arrangement (20) for actual value formation contains two transistor stages with complementary transistors (15, 11). The circuit arrangement is especially suited for redundant feed of equipment of electrical message transmission technology.

Abstract: A differential voltage monitor is shown using a resistive bridge to produce a sample value representing that differential voltage. A portion of the resistive bridge is located on an IC and a portion is external to the IC. The object is to compare the differential voltage with a reference, producing a logic signal at a threshold level. The threshold level serving as a reference and the sample valve representing the differential voltage are made to be equally dependent on the bridge components located on the IC. In this way, any changes in the IC located bridge resistors compared to the bridge resistors located outside the IC are prevented from affecting the measurement.

Abstract: A direct-current stabilizer includes an n-p-n transistor as a control transistor, and a control terminal to which a control voltage for driving the control transistor is applied. The value of the control voltage is determined so that a voltage applied to the base of the control transistor is not lower than the sum of the emitter voltage and the base-emitter voltage. With this structure, since the control transistor is driven by the control voltage of a value different from that of the input voltage, it is possible to limit the input voltage to a low value, allowing the difference between the input voltage and the output voltage to be minimized. Moreover, it is possible to switch the output of the direct-current stabilizer by connecting to the control terminal a transistor for switching the application of the control voltage to the control terminal between on and off. Furthermore, when the control terminal is connected to the input terminal, the control transistor is driven by the input voltage.

Abstract: A voltage regulator employs a PNP output transistor of vertical construction, which operates as a linear control element in a feedback controlled circuit which is formed in a substrate. A differential amplifier has one input coupled to a voltage reference and another input coupled via feedback from a resistive voltage divider connected between common and the output of the voltage regulator. A parasitic NPN transistor, which is merged physically and thermally with the structure of the PNP output transistor, senses the onset of output transistor saturation and re-routes the majority of the excess base current drive to a feedback control node. The feedback control node retards total excess drive via a reduction in drive amplifier gain and bandwidth thereby assuring good stability of feedback loop operation during all phases of saturation, without the need for additional frequency compensating elements.

Abstract: A voltage regulation circuit that includes a sample and hold circuit for sampling an input voltage and for holding a reference voltage generated in response to the input voltage. The sample and hold circuit includes a capacitor that holds the reference voltage. The voltage regulation circuit also includes a regulator circuit coupled to the capacitor of the sample and hold circuit. The regulator circuit outputs an output voltage using the reference voltage supplied by the capacitor. The voltage regulation circuit may be used to provide a high precision programming voltage for programming memory cells having two or more analog states.

Abstract: An on-board regulated voltage up-convertor for converting a first DC voltage at a first node from an electronic system to a second DC voltage for an integrated device at a second node. The convertor comprises reference generator means for generating a predetermined reference voltage at start-up, voltage regulator means coupled to said first node for regulating said first voltage at a predetermined voltage at a third node, voltage multiplier means coupled to said third node and to said second node for multiplying said predetermined voltage to generate an output voltage substantially equal to said second voltage, feedback means coupled to said second node for feeding said output voltage back to said voltage regulator means to adjust the level of said predetermined voltage at said third node according to how said output voltage is relative to said second voltage.

Abstract: A novel supply discriminator circuit is disclosed for detecting the level of a supply voltage during power-up of a system for configuring an integrated analog circuit such as a PCMCIA card. The circuit compares a reference voltage with a divided down supply voltage and latches the result a predetermined delay later. The delay thus provides timing for the supply voltage to stabilize after power-up to assure accurate detection, as well as noise immunity from other devices.

Abstract: A voltage regulator especially adaptable for use with field-programmable gate arrays (FPGAs). The voltage regulator includes a frequency compensated differential amplifier, a configurable feedback network for setting the gain of the voltage regulator, and a plurality of source follower devices for driving the feedback network and providing a regulated supply voltage. A bandgap generator may also be provided for generating a reference bias voltage that is independent of temperature.

Abstract: A power supply controller includes a comparator for providing a regulated voltage when an input voltage exceeds a reference voltage, so that a reference voltage is provided to drive a load discharge circuit. When the input voltage is less than the reference voltage, such as during a startup or sleep mode of operation of the controller, the load discharge circuit is driven by an output pulldown circuit so as to maintain minimum functions within the integrated circuit of the controller including turnoff of an external MOSFET. The output pulldown circuit senses the resulting absence of the regulated voltage using a first transistor coupled to be biased into nonconduction when the regulated voltage is not provided. This biases a second transistor into conduction to maintain a transistor within the load discharge circuit conductive. In this manner, the output powers its own operation, including the pulldown thereof.

Abstract: A spacecraft (10) includes N paralleled power converters (24a, 24b . . . ) for producing current pulses in response to converter synchronizing pulses. The current pulses are integrated (28) to produce an operating direct voltage. The synchronizing pulses are produced in a recurrent cycle by a synchronizer (30). The synchronizer includes a voltage divider (320) with equal series-connected elements (324a, 324b . . . ), each of which is paralleled by a shorting switch (330a, 330b . . . ). A sawtooth signal generator (310) produces a sawtooth signal (312), which is applied in common to each of a plurality of comparators (332a, 332b . . . ). The voltage divider (320) is connected across a reference voltage (318), to produce a plurality of reference voltages at the taps (328a, 328b). Each comparator (332) compares the sawtooth ramp (314) with one of the reference voltages, so that the comparators trigger in sequence as the ramp rises. The comparators trigger at times corresponding to equal phase increments of 360.

Abstract: A gradient detecting unit detects the gradient in the output of a driven circuit. An offset voltage generating unit generates an offset voltage in response to an output of a driven circuit as well as the gradient detected by the gradient detecting unit. The gradient in the output of the driven circuit is increased as the change thereof is more abrupt and decreased as the change thereof is more gentle. For example, if the detected gradient is added to the normal offset voltage to form an offset voltage, the offset voltage can follow the changes in the output of the driven circuit to supply a proper supply voltage to the driven circuit.

Abstract: A band-gap voltage regulator having a self-regulating characteristic which improves the operation of the regulator includes a feedback circuit coupling a gain stage of the regulator to a voltage reference circuit which influences the regulated voltage. Changes in the operation of the gain stage which would otherwise change the regulated voltage produce counteracting changes in the voltage reference circuit, causing the supply voltage to remain substantially constant.

Abstract: A step-down circuit for power supply voltage, which converts an external power supply voltage into a first voltage that is lower than the external power supply voltage so as to apply it to an internal circuit, is provided with: a reference voltage generation circuit for generating a reference voltage from an external power supply voltage, a differential amplification circuit for releasing a difference between the reference voltage and the first voltage as a control signal, a driving circuit for controlling a driving current to be supplied to the internal circuit according to the control signal from the differential amplification circuit, a signal generation circuit for releasing a detection signal by detecting an increase of consumption current in the internal circuit, and a control means for controlling the driving circuit so as to increase the current to be supplied to the internal circuit in accordance with the detection signal from the signal generation circuit.

Abstract: While a current control circuit is arranged outside an integrated circuit, a voltage detection circuit, a reference voltage generating circuit and an error amplifier circuit of a feedback system supplied with output voltage V via a terminal, together with a signal processing circuit, are integrated and miniaturized in the integrated circuit 103. Moreover, a terminal 103 is provided in order to connect a capacitor C from the outside. The output voltage V is stabilized by stabilizing a reference voltage signal R further to ensure high-precision signal processing. Thereby, an integrated circuit is provided incorporating a constant-voltage control circuit fit for precise signal processing even when only power at a voltage exceeding the withstand voltage of an integrated circuit is supplied and the integrated circuit is at the same time capable of contributing to the miniaturization of an apparatus in which it is used.

Abstract: A high-speed, fully-floating, current source/sink utilized a current mode operational amplifier to drive a power MOSFET without ringing or instability. The output of the current mode op amp is directly connected to the MOSFET gate. The current source relies on an optical link to enable an analog switch to generate carefully controlled pulse width characteristics at the positive input of the op amp.

Abstract: A comparator circuit, for a switched resistive network which may be combined with a transconductance amplifier, simultaneously and independently compares a plurality of input voltages to a reference voltage. The circuit comprises a current splitter having a current input, a plurality of comparator outputs, and a corresponding plurality of voltage inputs that control the fraction of the input current available at each comparator output. A reference output of the current splitter is provided as an input to a current mirror, and each of the comparator outputs of the current splitter is connected to a corresponding output of the current mirror. The current available at each of the current mirror outputs is a function of the reference input provided from the current splitter. The comparator circuit needs only one bias input and one reference input. The inclusion of a second biasing device with an associated mirror device produces a transconductance amplifier combined with the comparator circuit.

Abstract: A stabilized power supply circuit is prevented from being affected by a heavy load. A transistor (Q.sub.1) having a smaller emitter area, a transistor (Q.sub.2) having a larger emitter area, and an output transistor (Q.sub.3) are incorporated in an IC. The distance (L.sub.1) between the first transistor (Q.sub.1) and the output transistor (Q.sub.3) is longer than the distance (L.sub.2) between the second transistor (Q.sub.2) and the output transistor (Q.sub.3).