Method for compensating common mode feedback circuit frequency of two-stage amplifier
A common-mode feedback and frequency compensation technology, applied in the direction of differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problems of poor common-mode output level capability, gain reduction, and low-frequency gain reduction of common-mode feedback circuits, etc., to achieve large Effect of phase margin and stability improvement
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[0011] image 3 A schematic circuit of a two-stage amplifier with a common-mode feedback circuit is depicted. On the left is a two-stage amplifier structure, where V in+ and V in- is the differential input of the two-stage amplifier, V out+ and V out- is the differential output of the two-stage amplifier. The first stage of the two-stage amplifier uses a transconductance enhancement circuit to increase the equivalent transconductance of the input tube, and uses a source negative feedback resistor to reduce the distortion of the input tube transconductance. Nodes ① and ② are the outputs of the first stage amplifier. The second-stage amplifier adopts a common-source structure, and nodes ③ and ④ are the outputs of the second-stage amplifier. V cmfb It is the output control signal of the feedback amplifier in the common-mode feedback circuit. This signal is added to the gate of the MOS transistor of the two-stage amplifier, and at the same time realizes the control of the co...
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