COMMON MODE VOLTAGE LEVEL SHIFTING AND LOCKING CIRCUIT
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United States of America Patent
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Issued Date -
Nov 5, 2020
app pub date -
Dec 19, 2019
filing date -
May 2, 2019
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Abstract
A common mode voltage level shifting and locking circuit is provided. The common mode voltage level shifting and locking circuit includes an operational amplifier, a source follower, a first feedback circuit, and a second feedback circuit. The operational amplifier generates a first common mode voltage. The source follower shifts the first common mode voltage to generate a second common mode voltage. The first feedback circuit generates a first control signal according to the second common mode voltage. The operational amplifier adjusts the first common mode voltage according to the first control signal. The second feedback circuit generates a second control signal according to an external reference voltage provided by a next stage circuit. The source follower adjusts the second common mode voltage according to the second control signal such that the next stage circuit reaches a maximum input common mode range.
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