Common-mode feedback circuit for duration of two-stage differential amplifier
A common-mode feedback and amplifier technology, applied in the field of continuous-time common-mode feedback circuits, can solve problems such as amplifiers not working properly
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Embodiment 1
[0023] Such as figure 2 As shown, the present invention provides a continuous-time common-mode feedback circuit 200 for a two-stage differential amplifier, including a two-stage differential amplifier for detecting the output common-mode voltage (denoted as Vocm2) of the two-stage differential amplifier. A common-mode voltage detection unit 201, and a common-mode feedback control signal generating unit 202 for controlling the first-stage current source load 203 of the two-stage differential amplifier to stabilize at its preset DC operating point; the two-stage differential amplifier The two outputs (the voltages of the two outputs are respectively denoted as Von2 and Vop2 here) are respectively connected to the common-mode voltage detection unit 201, and the output A2 of the common-mode voltage detection unit 201 is connected to the common-mode feedback control signal to generate A unit 202, the two outputs B2 and C2 of the common-mode feedback control signal generating unit ...
Embodiment 2
[0036] Figure 4 It is another embodiment of the present invention. In this embodiment, the second common-mode voltage detection unit 401 and the second common-mode feedback control signal generation unit 402 are respectively connected with the common-mode voltage detection unit 201 and the common-mode feedback control signal generation unit 402 in Embodiment 1. The signal generation unit 202 is the same, and the structure of the two-stage differential amplifier in this embodiment is different from that of the first embodiment, but the working principle is the same as that of the first embodiment.
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