voltage generator

A voltage generator and generator technology, applied in the direction of instruments, adjusting electrical variables, control/regulation systems, etc., can solve problems such as inability to meet low power supply voltage, and achieve the effect of maintaining low current operation

Active Publication Date: 2020-01-03
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the existing low-dropout voltage regulators will not be able to meet the needs of maintaining low-current operation at low supply voltages

Method used

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Embodiment Construction

[0052] Please refer to figure 1 , figure 1 A schematic diagram of a voltage generator according to an embodiment of the present invention is shown. The voltage generator 100 includes a bias generator 110 , a switch 120 , a comparator CMP1 , a bias current regulator 140 and an output stage circuit 150 . The bias generator 110 is coupled to the switch 120 and coupled to the power terminal PWT through the switch 120 . The bias voltage generator 110 receives the power voltage VIN provided by the power terminal PWT, and generates the bias voltage VG according to the bias current IOP flowing through the bias voltage generator 110 . The switch 120 is connected in series between the path of the bias voltage generator 110 coupled to the power terminal PWT, and the switch 120 is controlled by the control signal POFF to be turned on or off.

[0053] The comparator CMP1 is coupled to the switch 120 . The comparator CMP1 receives the error amplification signal VOP and the threshold v...

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PUM

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Abstract

A voltage generator comprises a bias generator, a switch, a first comparator, a bias current regulator, and an output stage circuit. The bias generator receives a bias current to generate a bias voltage. The switch is connected in series between the paths of the bias generator coupled to the power supply terminal, and is controlled by the control signal. A first comparator compares the error amplification signal with a first threshold voltage to generate a first comparison result, and generates a control signal according to the first comparison result. The bias current regulator generates an error amplification signal according to the reference voltage and the feedback voltage, and adjusts the magnitude of the bias current according to the error amplification signal. The output stage circuit receives the bias voltage and generates an output voltage based on the bias voltage. Wherein, the feedback voltage is generated according to the output voltage.

Description

technical field [0001] The present invention relates to a voltage generator, and more particularly to a low drop-out (LDO) voltage generator that maintains low current operation at low supply voltage. Background technique [0002] With the evolution of electronic technology, providing optimized electronic products has become a necessary trend. In integrated circuits, with the demand for high operating speed, low power consumption and high stability, low operating current, high noise immunity (high power supply rejection ratio (PSRR) and fast-response voltage generation The circuit breaker becomes an important component in the integrated circuit. [0003] In the prior art, a low drop-out (LDO) voltage regulator is often used as a voltage generator in an integrated circuit. Among them, the prior art low-dropout voltage regulator, please refer to Figure 9 The circuit diagram of an existing low-dropout voltage regulator is shown. When the voltage value of the power supply vo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 李铭富
Owner HOLTEK SEMICON
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