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High-precision voltage regulator

A voltage regulator and reference voltage technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve the problems of inaccurate output voltage of the voltage regulator, device mismatch, affecting the output voltage accuracy, etc.

Active Publication Date: 2019-11-19
NANJING ZGMICRO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the integrated circuit process will cause device mismatch during mass production, the output voltage of the voltage regulator is therefore not accurate enough
In addition, the device also has noise, which also affects the accuracy of the output voltage.

Method used

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Embodiment Construction

[0039] The present application will be described in further detail below in conjunction with specific embodiments, but it is not intended to limit the present application. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0040] The oscillator 102 generates a non-overlapping first clock signal CK1 and a second clock signal CK2 . The first clock signal CK1 is used to control the on and off of the first switch SW1 and the second switch SW2. The second clock signal CK2 is used to control the turn-on and turn-off of the third switch SW3 and the fourth switch SW4. When the first clock signal CK1 controls the first switch SW1 and the second switch SW2 to be turned on, and the second clock signal CK2 controls the third switch SW3 and the fourth switch SW4 to be turned off, th...

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PUM

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Abstract

The invention provides a high-precision voltage regulator. In one embodiment, an oscillator controls the on-off of a first switch and a second switch by generating a first clock signal, and controls the on-off of a third switch and a fourth switch by generating a second clock signal. When the first clock signal switches on the first switch and the second switch and the second clock signal switchesoff the third switch and the fourth switch, the voltage difference between a first input end and a second input end of an operational amplifier is sampled to a second capacitor. When the first clocksignal switches off the first switch and the second switch and the second clock signal switches on the third switch and the fourth switch, an equivalent input adaptation voltage stored on the second capacitor is used to provide a reference voltage for the second input end of the operational amplifier. The input equivalent offset voltage of the operational amplifier is eliminated, and the output voltage of the voltage regulator does not depend on the offset voltage of the operational amplifier. Therefore, the output voltage precision of the voltage regulator is improved.

Description

technical field [0001] The invention relates to the technical field of voltage regulators, in particular to a high-precision voltage regulator. Background technique [0002] Since the integrated circuit technology will cause device mismatch during mass production, the output voltage of the voltage regulator is therefore not accurate enough. In addition, the device also has noise, which also affects the accuracy of the output voltage. In order to design higher precision regulators, it is necessary to improve existing regulator designs. Contents of the invention [0003] In view of this, the embodiment of the present application provides a high-precision voltage regulator [0004] In the first aspect, the application of the present invention provides a high-precision voltage regulator, including: a reference voltage circuit, an oscillator, and an operational amplifier; [0005] The oscillator controls the on and off of the first switch and the second switch by generating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 王钊
Owner NANJING ZGMICRO CO LTD