Amplifier circuit with amplitude and phase correction and method

Details Amplifier circuit with amplitude and phase correction and method Amplifier circuit with amplitude and phase correction and method

1999-05-25

2000-11-21

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 69, 330259, 327318, 327359, H03F 345

Patent

active

061508810

ABSTRACT:
A correction circuit (10) includes a transistor (30) that generates a feedback signal for equalizing the amplitude and adjusting the phase of the output signals (V.sub.OUT- and V.sub.OUT+) that are provided at the output of the variable gain amplifier (10). The base terminal of the transistor (30) receives a summed value of the output signals (V.sub.OUT- and V.sub.OUT+). The summed value is inverted and fed back to the differential transistors (12 and 14) and combined with the output signals (V.sub.OUT- and V.sub.OUT+). The output signals (V.sub.OUT- and V.sub.OUT+) have a proper amplitude and phase relationship when the summed value is substantially zero.

REFERENCES:
patent: 5008632 (1991-04-01), Sutterlin
patent: 5644264 (1997-07-01), Chiu et al.
patent: 6046638 (2000-04-01), Hogeboom
Holt "Electronic Circuits Digital and Analog" Copyright 1978 John Wiley & Sons, Inc, p. 427.

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