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Charge injection cancellation circuit, analog switch circuit, and sampling device

An analog switch circuit and charge injection technology, applied in electronic switches, electrical components, pulse technology, etc., can solve the problem of low sampling accuracy, improve sampling accuracy, reduce acquisition gain errors, and reduce or charge injection effects Effect

Pending Publication Date: 2021-08-06
SHENZHEN STATE MICROELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this application is to provide a charge injection elimination circuit, which aims to solve the problem of low sampling accuracy of the traditional analog switch application in the sampling system

Method used

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  • Charge injection cancellation circuit, analog switch circuit, and sampling device
  • Charge injection cancellation circuit, analog switch circuit, and sampling device
  • Charge injection cancellation circuit, analog switch circuit, and sampling device

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Embodiment Construction

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0037] see figure 1 , the embodiment of the present application provides a charge injection elimination circuit, including a first field effect transistor M1, a second field effect transistor M2, a first capacitor C1 and a second capacitor C2.

[0038]The gate of the first field effect transistor M1 is connected to the first control signal input terminal CN1 of the charge injection elimination circuit, the source of the first field effect transistor M1, the source of the second field effect transistor M2 and the first capacitor C1. One end...

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Abstract

The invention discloses a charge injection elimination circuit, an analog switch circuit and a sampling device, and the grid electrode and the source electrode of a second field-effect tube of the charge injection elimination circuit are connected with a first capacitor in series, and the grid electrode and the drain electrode of the second field-effect tube are connected with a second capacitor in series, and the grid capacitance of the second field-effect tube is compensated. The charge injection effect of a first field-effect tube and the second field-effect tube in the switching on-off state is reduced or eliminated. When the charge injection elimination circuit is applied to an analog switch in a sampling system, the charge injection effect can be reduced or eliminated, so that nonlinear effects such as acquisition gain errors and direct-current imbalance of an acquisition system are reduced, and the sampling precision of the sampling system is improved. And meanwhile, the analog switch circuit benefits from wide-range voltage power supply and supports single-power supply and double-power supply power supply, so that the analog switch circuit has relatively small on-resistance, and the linearity of data sampling of the analog switch circuit is improved due to low on-resistance.

Description

technical field [0001] The application belongs to the technical field of analog switches, and in particular relates to a charge injection elimination circuit, an analog switch circuit and a sampling device. Background technique [0002] Since the gate capacitances of the NMOS transistor and the PMOS transistor of the traditional analog switch are different, when the traditional analog switch is turned on or off, a small amount of charge will be coupled from the digital control line of the analog switch to the analog signal path through capacitance. This results in a charge injection effect that interferes with the output of the analog switch. When the analog switch with traditional structure is applied to the sampling system, the sampling system will have gain error, DC offset and nonlinear error due to the charge injection effect of the analog switch, which will lead to the problem of low sampling accuracy of the sampling system. Contents of the invention [0003] The pu...

Claims

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Application Information

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IPC IPC(8): H03K17/14
CPCH03K17/145
Inventor 宋阳廖宇航赵鹏李林旭黄太明
Owner SHENZHEN STATE MICROELECTRONICS CO LTD
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