Source follower and current feedback circuit thereof

Details Source follower and current feedback circuit thereof Source follower and current feedback circuit thereof

2007-12-04

2007-12-04

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including d.c. feedback bias control for stabilization

C330S285000, C330S288000

Reexamination Certificate

active

11300988

ABSTRACT:
A current feedback circuit is used in the source follower. The source follower includes a first MOS transistor and a current mirror. The first MOS transistor has a gate receiving an inputting signal and a source outputting an output signal. A drain current flows through the first MOS transistor. The current mirror generates the drain current according to an adding current. The current feedback circuit is used for stabilizing the drain current to a constant value substantially. The current feedback circuit includes a passive component and an operational amplifier. The passive component has a first end and a second end, which has an error voltage when a corresponding current flows through the passive component. The magnitude of the corresponding current changes with the magnitude of the drain current. The operational amplifier outputs a reference signal to adjust the adding current according to the error voltage and a reference voltage.

REFERENCES:
patent: 4532477 (1985-07-01), Green et al.
patent: 4912431 (1990-03-01), Duijves
patent: 5691663 (1997-11-01), Nayebi et al.
patent: 6046642 (2000-04-01), Brayton et al.
patent: 6434243 (2002-08-01), Read
patent: 7113043 (2006-09-01), Jin et al.

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