Gate voltage bootstrap switch circuit

Abstract

The invention discloses a gate voltage bootstrap switching circuit. The gate voltage bootstrap switching circuit comprises a main switching tube and a first gate voltage bootstrap unit, the first gatevoltage bootstrap unit is used for generating a first gate control voltage used for controlling the main switching tube according to a clock signal, a gate of the main switching tube is connected with the first gate voltage bootstrap unit, a drain of the main switching tube is connected with a signal input end, and a source of the main switching tube is connected with a signal output end; the second gate voltage bootstrap unit is used for generating a second gate control voltage used for controlling the virtual switch tube according to the clock signal, the gate of the virtual switch tube isconnected with the second gate voltage bootstrap unit, and the source and the drain of the virtual switch tube are connected with the signal output end. By adding the virtual switch tube, the charge injection effect of the main switch tube can be effectively eliminated, and the clock feed-through effect of the main switch tube can be effectively eliminated.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a gate voltage bootstrap switch circuit. Background technique [0002] With the continuous development of modern communication technology and the continuous improvement of people's requirements for communication speed, the frequency of analog signals in communication systems continues to increase, and the requirements for converting analog signals into digital signals continue to increase. Higher linearity when sampling an analog signal requires the use of a gate voltage bootstrap switching circuit. [0003] Refer to the background technology part of the Chinese patent application whose publication number is CN108155899A, the traditional grid voltage bootstrap switch circuit reference figure 1 As shown, it is composed of a main switching tube Ms and a gate voltage bootstrap circuit, wherein the gate voltage bootstrap circuit includes capacitors C7-C8 and ...

AI Technical Summary

Problems solved by technology

In addition, the clock feedthrough effect will appear at the moment when the main switch Ms is turned off

The clock feedthrough and charge injection will affect the sampling accuracy of the switch, thus limiting the application range of the gate voltage bootstrap switching circuit

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