Automatic output offset control for a DC-coupled RF amplifier

Details Automatic output offset control for a DC-coupled RF amplifier Automatic output offset control for a DC-coupled RF amplifier

1997-08-05

1999-03-23

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

330136, 330285, H03F 308, H03G 330

Patent

active

058865810

ABSTRACT:
An automatic output offset control circuit for a DC-coupled RF amplified optical-to-electrical converter has a photodiode for converting an optical signal to an electrical signal. The current from one side of the photodiode is coupled into the input of a bipolar RF amplifier that generates a voltage output. The current from the other side of the photodiode is sensed for generating a voltage that is compared with the output of the RF amplifier. Any mismatch between the sensed current and the RF amplifier generates an error signal that is used to control the DC bias supplies of the RF amplifier. The DC bias supplies are adjusted in unison to produce the correct offset at the amplifier output for the given photodiode current while maintaining a constant AC-gain. The circuit automatically corrects for the DC-coupled output offset drift and variations of the RF bipolar amplifier. The circuit may be implemented using either voltage or current signals to the feedback circuit.

REFERENCES:
patent: 4641378 (1987-02-01), McConnell et al.
patent: 4889985 (1989-12-01), Allsop et al.
patent: 5138274 (1992-08-01), Nakanishi et al.
patent: 5410282 (1995-04-01), Larrick et al.

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