Title：Pipelined analog-to-digital converter as well as operational amplifier adaptive configuration circuit and method thereof
Country：China
Patent No.：201710326116.8
Legal Status：Authorized
Inventor：Fule Li, Xiao Wang, Wen Jia, Zhihua Wang
Assignee：Research Institute of Tsinghua University in Shenzhen
Address：Room A302, Research Institute of Tsinghua University in Shenzhen, the Southern District of the High-tech Industrial Park, Nanshan District, Shenzhen 518057, Guangdong
Filing Date：2017-05-10
Issue Date：2022-04-01
Abstract：
The invention provides a pipelined analog-to-digital converter as well as an operational amplifier adaptive configuration circuit and method thereof. The operational amplifier adaptive configuration circuit comprises a residual step detection module, a configurable negative resistance unit array and an adaptive configuration control module. After the operational amplifier adaptive configuration circuit is powered on, the residual step detection module automatically adjusts the configurable negative resistance unit array by detecting the residual step of a stage circuit to be calibrated at zeroinput under the control of the adaptive configuration control module so as to maximize the open loop gain of an operational amplifier. The operational amplifier adaptive configuration circuit can becompatible with a front-end calibration circuit of the capacitance mismatch error of the stage circuit, and has the advantages of simplicity, high efficiency and small area overhead compared with a traditional operational amplifier finite gain error calibration circuit.
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