Switch-type operation amplifier with low power consumption

An operational amplifier and operational amplifier circuit technology, applied in the field of microelectronics, can solve problems such as consumption, slow switching speed, high current, etc., and achieve the effects of improving low gain, reducing current glitches, and reducing dynamic power consumption

Inactive Publication Date: 2011-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the two-stage operational amplifier itself is not a very efficient structure, especially when the load capacitance is relatively large, it needs to push the secondary point away from the origin, which will consume a lot of current
Traditional one-stage operational amplifiers, such as sleeve and folded cascode structures, are not suitable for low-voltage designs, and the switching speed is very slow

Method used

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  • Switch-type operation amplifier with low power consumption
  • Switch-type operation amplifier with low power consumption
  • Switch-type operation amplifier with low power consumption

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Embodiment Construction

[0026] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 As shown, a low-power switching operational amplifier includes a switching operational amplifier circuit 1, a common-mode feedback circuit 3 for providing a common-mode voltage feedback signal CMFB to the switching operational amplifier circuit 1, and a common-mode feedback circuit 3 for providing a common-mode voltage feedback signal CMFB to the switching operational amplifier circuit 1. The amplifying circuit 1 and the common-mode feedback circuit 3 provide a bias voltage signal Vbias to the bias circuit 2 .

[0028] The switching operational amplifier circuit 1 includes 2 switching tubes and 17 MOS tubes. Among them, the first MOS tube M 1 The gate of the switch-type operational amplifier is the positive...

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Abstract

The invention discloses a switch-type operation amplifier with low power consumption, which comprises a switch-type operation amplifying circuit, a common mode feedback circuit for providing a common mode voltage feedback signal to the switch-type operation amplifying circuit and a biasing circuit for providing a biasing voltage signal to the switch-type operation amplifying circuit and the common mode feedback circuit. The switch-type operation amplifier is in a manner of first level current mirror, of which the input level load uses an internal positive feedback structure to improve gain and the output level is in wide amplitude AB type; and while the amplifier is not needed to work, two switch tubes are used for closing the amplifying circuit, the biasing circuit and common mode feedback circuit totally; therefore, the power consumption is greatly reduced, and the switch-type operation amplifier with low power consumption can be widely applied to fields of analogue-digital converters, filters and the like.

Description

technical field [0001] The invention belongs to the technical field of microelectronics, and in particular relates to a low power consumption switching operational amplifier. Background technique [0002] The development of modern integrated circuit and SOC (system-on-chip) technology has promoted the popularization and application of portable electronic equipment. An analog-to-digital converter (ADC, Analog-to-Digital Converter) is one of the indispensable key functional components in the electronic system of the portable device. Switched capacitor circuits are widely used in analog-to-digital converters because they can realize various proportional coefficients very accurately and are not sensitive to various influences such as process and ambient temperature changes. [0003] The operational amplifier is the core unit of the switched capacitor circuit, how to reduce the power consumption of the amplifier is the key to reduce the power consumption of the system. The swit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/34H03F3/45
Inventor 吴晓波王汉卿罗惠洲赵津晨
Owner ZHEJIANG UNIV
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