发明名称 |
Common-mode feedback differential amplifier |
摘要 |
The present invention discloses a common-mode feedback differential amplifier circuit, a common-mode feedback differential amplification method, and an integrated circuit. In an example, a common-mode feedback (CMFB) loop conducts voltage division on a first common-mode signal to generate a second common-mode signal and a third common-mode signal, a differential amplifier sets a voltage of the signal with the higher voltage between the second common-mode signal and the third common-mode signal equal to a voltage of a first input terminal or a second input terminal, and the CMFB loop controls the differential amplifier to output an output signal with the minimum voltage equal to the voltage of the first common-mode signal. |
申请公布号 |
US9431978(B2) |
申请公布日期 |
2016.08.30 |
申请号 |
US201414448855 |
申请日期 |
2014.07.31 |
申请人 |
FAIRCHILD SEMICONDUCTOR CORPORATION |
发明人 |
Huang Lei |
分类号 |
H03F3/45 |
主分类号 |
H03F3/45 |
代理机构 |
Schwegman Lundberg & Woessner, P.A. |
代理人 |
Schwegman Lundberg & Woessner, P.A. |
主权项 |
1. A common-mode feedback differential amplifier circuit, comprising:
a common-mode feedback (CMFB) loop; and a differential amplifier, wherein the CMFB loop is configured to perform voltage division on a first common-mode signal to generate a second common-mode signal and a third common-mode signal, output the second common-mode signal and the third common-mode signal to the differential amplifier, and control, according to a negative feedback principle, the differential amplifier to output an output signal with a minimum voltage equal to a voltage of the first common-mode signal, and wherein the differential amplifier is configured to receive the second common-mode signal and the third common-mode signal, set a higher one of voltages of the second common-mode signal and the third common-mode signal equal to a voltage of a first input terminal or a second input terminal, and output, under control of the CMFB loop, the output signal with the minimum voltage equal to the voltage of the first common-mode signal. |
地址 |
San Jose CA US |