Bootstrap sampling switch circuit and bootstrap circuit

Abstract

The invention provides a bootstrap sampling switch circuit and a bootstrap circuit. The bootstrap circuit comprises a diode D1, a charging capacitor C1, a phase inverter, a third P-channel metal oxide semiconductor (PMOS) tube M3, a fourth N-channel metal oxide semiconductor (NMOS) tube M4, a fifth NMOS tube M5, a sixth NMOS tube M6, a seventh PMOS tube M7 and an eighth NMOS tube M8, wherein the input end of the phase inverter is connected with a clock (CLK), while the output end is connected with the grid of the M3 and the grid of the M4; the source of the M3 is connected with a virtual device driver (VDD); the source of the M4 is connected with Vin; the drain of the M3 is connected with the drain of the M4; the source of the M5 is connected with the Vin; the grid of the M5 is connected with Vboot; the drain of the M5 is connected with the drain of the M6 and one plate of the capacitor; the grid of the M6 is connected with the CLK, while the source is connected with the ground (GND);the positive end of the D1 is connected with the VDD, while the negative end is connected with a second plate of the C1 and the source of the M7; the grid of the M7 is connected with the drain of theM3; the drain of the M7 and the source of the M8 are connected with the Vboot; and the grid of the M8 is connected with the VDD, while the drain is connected with the output end of the phase inverter.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a bootstrap sampling switch circuit and a bootstrap circuit. Background technique [0002] With the development of modern communication technology and signal processing technology, the demand for high-speed and high-precision semiconductor integrated circuits is increasing. In the field of analog processing, it is often necessary to convert an analog signal into a digital signal, and then perform further processing through a digital signal processing module. In the process of converting an analog signal to a digital signal, a sampling switch is often required to meet the performance requirements of the analog-to-digital converter. [0003] Based on the requirements for the performance of the sampling switch, a bootstrap sampling switch is often used. This technique is mainly used in sample and hold circuits. The structure of the bootstrap switch is as figure 1 As shown, the boot...

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Problems solved by technology

This additional clock voltage boost circuit increases the complexity of the circuit

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