Charge domain assembly line ADC adopting high-precision digital-analog hybrid calibration

Abstract

The invention relates to a charge domain assembly line ADC adopting high-precision digital-analog hybrid calibration. The charge domain assembly line comprises an assembly line circuit which comprisesa sampling holding circuit and N assembly line sublevel circuits serially connected sequentially, the assembly line sublevel circuit connected with the sampling holding circuit forms a first-level assembly line sublevel circuit, and the rest assembly line sublevel circuits sequentially form second-level assembly line sublevel circuit to Nth-level assembly line sublevel circuit; the charge domainassembly line further comprises a common-code charge detection device, a common-code feedforward device, a common-mode detection processing circuit, a common-mode M-bit adjusting register block, a common-mode charge adjusting device, a calibration mode control circuit, an error comparator, a difference-mode detection processing circuit, a calibration controller, a M-bit adjusting register array and a reference voltage adjusting circuit array. The charge domain assembly line can accurately compensate common-mode charge errors and capacitance adapting errors, so that conversion performance of acharge domain assembly line converter is improved.

Description

technical field [0001] The invention relates to an ADC circuit, in particular to a charge domain pipeline ADC using high-precision digital-analog hybrid calibration, and belongs to the technical field of charge domain pipeline ADCs. Background technique [0002] With the continuous development of digital signal processing technology, the digitization and integration of electronic systems is an inevitable trend. However, the signals in reality are mostly continuously changing analog quantities, which need to be converted into digital signals by analog-to-digital conversion before they can be input into digital systems for processing and control. Therefore, analog-to-digital converters (ADC) are important in future digital system design. Indispensable component. In applications such as broadband communications, digital high-definition television, and radar, systems require analog-to-digital converters with both very high sampling rates and resolutions. Portable terminal prod...

AI Technical Summary

Problems solved by technology

For charge-domain pipelined ADCs with a precision of more than 12 bits, the component mismatch differential-mode error and common-mode error caused by the existing process conditions cannot be ignored

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