Variable gain amplifier with gain linear with control voltage

Details Variable gain amplifier with gain linear with control voltage Variable gain amplifier with gain linear with control voltage

1998-09-30

2000-09-26

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330256, 327356, 327359, H03F 345

Patent

active

061247618

ABSTRACT:
A variable gain amplifier (VGA) having a control voltage source that provides high gain-to-control voltage linearity over at least an 80 dB gain range. Further, the gain curve for the VGA is essentially independent of temperature. In the preferred embodiment, the VGA includes a two-stage bipolar differential amplifier. Each stage is a transconductor followed by current steering. The first stage amplifier is coupled to an exponentially varying current source to change the transconductance of the stage. The second stage amplifier is coupled to an fixed current source to maintain a fixed transconductance for the stage. To obtain exponential current steering, the control signal for the current steering circuitry is pre-distorted by the following equation:

REFERENCES:
patent: 3684974 (1972-08-01), Soloman et al.
patent: 5994961 (1999-11-01), Lunn et al.

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