| 摘要 |
A differential amplifier with switched capacitor common mode feedback includes a differential telescopic cascode amplifier in which the differential output terminals are individually coupled to a common mode input bias terminal via separate feedback capacitors. During a first time period (e.g., a sampling period), the output terminals are connected together via a pair of output switches to provide a common mode output voltage in response to a common mode input bias voltage applied to the bias terminal via an input switch. An operational amplifier compares the common mode output voltage to a common mode reference voltage and, based upon the difference between such voltages, generates the common mode input bias voltage. During a second time period (e.g., a holding period), the input and output switches are all opened and the output terminals provide a differential output voltage in response to a differential input signal applied to the differential input terminals.
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