Circuit improving dynamic switch linearity in analog-to-digital converter

Abstract

The invention discloses a circuit improving dynamic switch linearity in an analog-to-digital converter. The circuit is characterized by comprising a high voltage power generation circuit, a sampling phase clock voltage conversion circuit, and a holding phase clock voltage conversion circuit, wherein the high voltage power generation circuit mainly comprises N voltage boost units that are in parallel connection, each of the sampling phase clock voltage conversion circuit and the holding phase clock voltage conversion circuit comprises M clock voltage conversion units that are in parallel connection, the voltage boost unit mainly comprises seven inverters, two NOR gates, two NAND gates, two buffer units, six NMOS transistors and five capacitors, and the clock voltage conversion unit mainly comprises three PMOS transistors, one NMOS transistor, and a capacitor. The circuit has advantages of improving the performance of a comparator, lowering device imbalance, reducing chip area, loweringswitch power consumption, having strong output and drive capabilities, stable switch signals and so on.

Description

technical field [0001] The invention relates to a circuit for improving the linearity of a dynamic switch in an analog-to-digital converter, which is mainly used in a low-power pipeline analog-to-digital converter and belongs to the technical field of integrated circuits. Background technique [0002] High-speed and high-precision A / D converters have been widely used in measurement and control systems, radars, satellites, high-speed imaging, quadrature radio receivers, diversity radio receivers, communications and other fields. Driven by market demand in recent years, new technologies in high-speed and high-precision A / D converters continue to emerge. At present, research on pipeline A / D converter products in the industry mainly focuses on three aspects: increasing speed, improving precision and reducing power consumption. [0003] In the low-power design of the pipeline ADC, due to the power consumption limitation, the charging and discharging current of the key node capac...

AI Technical Summary

Problems solved by technology

[0007] The technical problem of the present invention is: to overcome the deficiencies of the prior art, use an array voltage booster to supply power to all comparator switches in the switched capacitor circuit of the pipeline analog-to-digital converter, improve its linearity, and solve the problem of comparator imbalance

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