Input common mode voltage offset compensation circuit of pipelined analog-to-digital converter

Abstract

The invention provides a circuit for carrying out detection and compensation on input common mode offset error in a charge-coupled pipelined analog-to-digital converter. The circuit comprises an input common mode detection module used for carrying out detection treatment on common mode level of an input signal, a common mode offset quantification module used for carrying out quantification on offset error amount obtained by detection, a shift and controller module used for controlling the working of the whole circuit and providing error-correcting codes and an error compensation module used for carrying out compensation on common mode charge signals of all charge-coupled sublevel pipelined circuits according to the produced error-correcting codes. The embodiment has the advantages of being capable of automatically detecting the common mode offset error in the charge-coupled pipelined analog-to-digital converter due to the input signal, carrying out the quantification and the compensation on the common mode offset error, further overcoming the limitations of the common mode offset error of the input signal on the dynamic performances of the existing charge-coupled pipelined analog-to-digital converter and further improving the conversion performance of the existing charge-coupled pipelined analog-to-digital converter.

Description

technical field [0001] The invention relates to a circuit for detecting and compensating the non-ideal characteristics of an analog-to-digital converter, in particular to a circuit for detecting and compensating the input common-mode voltage offset error in a charge-coupled assembly line analog-to-digital converter. Background technique [0002] With the continuous development of digital signal processing technology, the digitization and integration of electronic systems is an inevitable trend. However, most signals in reality are continuously changing analog quantities, which need to be transformed into digital signals through analog-to-digital conversion before they can be input into digital systems for processing and control. Therefore, analog-to-digital converters are indispensable in future digital system design. Part. In applications such as broadband communications, digital high-definition television, and radar, systems require analog-to-digital converters with both ...

AI Technical Summary

Problems solved by technology

and for figure 1 The charge-coupled sample-and-hold circuit shown in , due to the cancellation of the high-gain operational amplifier, the input common-mode voltage signal The change of will directly affect the output common-mode charge Qcm, that is, the circuit does not have any common-mode rejection capability

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