Inverse pseudo fully-differential amplifier having common-mode feedback control circuit

摘要

An inverse pseudo fully-differential amplifier having a common-mode feedback control circuit and a method for maintaining a stable output common-mode level are provided. The inverse pseudo fully-differential amplifier includes the pseudo fully-differential operation circuit and a common-mode feedback control circuit. The pseudo fully-differential operation circuit includes inverter amplifiers (2) and (3). The inverter amplifiers (2) and (3) respectively have a first feedback control terminal and a second feedback control terminal. Input terminals of the common-mode feedback control circuit are respectively connected with output terminals of the inverter amplifier (2) and (3), and are configured to detect common-mode output voltages of the inverter amplifier (2) and (3). An output terminal of the common-mode feedback control circuit is connected with the first feedback control terminal and the second feedback control terminal, and is configured to generate common-mode feedback to the inverter amplifiers (2) and (3) to maintain a stable common mode output level.