CMOS gate voltage bootstrapping switch circuit

Abstract

The invention provides a CMOS gate voltage bootstrapping switch circuit which comprises a charge pump circuit, a gate electrode charge and discharge circuit, an input buffering circuit and a switch circuit. The charge pump circuit is electrically connected to the gate electrode charge and discharge circuit. The gate electrode charge and discharge circuit is electrically connected to the switch circuit. The input buffering circuit is arranged between the gate electrode charge and discharge circuit and the switch circuit. According to the invention, the input buffering circuit is adopted to drive a charge pump circuit. Such a design greatly reduces the input of parasitic capacitance because the input buffering circuit separates the inputted signal from an inputting end and the charge pump circuit. Beyond that, the CMOS gate voltage bootstrapping circuit provided by the invention overcomes the problems that a conventional CMOS gate voltage bootstrapping circuit only achieves constant gate-source voltage Vgs of a switching tube and omits a substrate bias effect to cause the non-linearity introduced by Vth change .

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a CMOS gate voltage bootstrap switch circuit. Background technique [0002] With the rapid development of semiconductor technology, high-speed and high-precision analog-to-digital converters have been widely used in digital communications, military radar and other fields. Pipelined ADC, as one of the mainstream ADC products at present, can well take into account the requirements of speed and precision. In the pipeline analog-to-digital converter, the digital-to-analog converter (MDAC) with multiplication is an important part, and its performance determines the performance of the entire pipeline analog-to-digital converter. With the shrinking of the process size, the switch circuit used in MDAC will undoubtedly face new challenges. For the switching circuit in the digital-to-analog converter with multiplication, it requires low on-resistance, small area, high precisi...

AI Technical Summary

Problems solved by technology

The existing bootstrap technology improves the nonlinear distortion caused by the change of the switching gate-source voltage Vgs, but it ignores the linearity problem caused by the change of Vth caused by the body effect

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