High-speed high-linearity grid voltage bootstrap switch for assembly line ADC

Abstract

The invention discloses a high-speed high-linearity grid voltage bootstrap switch for a pipeline ADC, the switch comprises a field effect transistor M1, the drain of the field effect transistor M1 is the output end of the grid voltage bootstrap switch, and the grid of the field effect transistor M1 is connected with the grid of a field effect transistor M3, the grid of a field effect transistor M2, the grid of a field effect transistor M5, the drain of a field effect transistor M6 and the drain of a field effect transistor M8; the source electrode of the field effect transistor M1 is connected with the drain electrode of the field effect transistor M3 and the drain electrode of the field effect transistor M2 and serves as the input end of the grid voltage bootstrap switch. The substrate of the field effect transistor M1 is connected with the drain electrode of the field effect transistor M4 and the source electrode of the field effect transistor M3. According to the invention, the irrelevance between the on resistance of the main switching tube of the gate voltage bootstrap switch and an input signal can be effectively improved, and meanwhile, the charge-discharge speed of the bootstrap capacitor is improved by adopting the transistor and diode connected single charge pump, so that the linearity and the speed of the gate voltage bootstrap switch are integrally improved.

Description

Technical field [0001] The present invention relates to the field of pipeline ADC, and more particularly to a high-speed high linearity gate pressure switch for pipeline ADC. Background technique [0002] As the analog-to-digital converter continues to develop, people have gradually evolved into higher conversion speed and precision. For pipeline ADCs, the feature of the pipeline structure has its performance advantage in the high-speed high-precision field. The sample hold circuit processes the input signal directly in the pipeline ADC, where the gate pressure switches are used to achieve switching of the working state of the sample hold circuit, so the gate pressure feeds can directly affect the speed and accuracy requirements of the entire pipeline ADC. . [0003] Switches for sampling are generally single tube MOS switches, CMOS switches, and gate pressure switches. The single tube MOS switch and the CMOS switch cause its conduction resistance with the input signal with the i...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, a high-speed and high-linearity grid voltage bootstrap switch for pipeline ADCs provided by the present invention solves the problem that traditional grid voltage bootstrap switches cannot meet the high-speed and high-precision application requirements of pipeline ADCs

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