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

US11050386B2 · kind B2 · utility

Assignee

• Beijing SmartChip Microelectronics Technology Co., Ltd. · CN

Inventors

• Yubo Wang · Beijing, CN
• Xiaoke Tang · Beijing, CN
• Yi HU · Chengdu, CN
• Dejian Li · Beijing, CN
• Jin Yan Shao · Beijing, CN
• Xi Feng · Shanghai, CN
• Wennan Feng · Beijing, CN
• Jiali Hou · Beijing, CN

Key dates

• Filing date: Jul 3, 2019
• Grant date: Jun 29, 2021
• Expiry date: Jul 3, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03F2203/45551
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

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.