Temperature controlled, log-linear gain control circuit for...

Details Temperature controlled, log-linear gain control circuit for... Temperature controlled, log-linear gain control circuit for...

2006-12-05

2006-12-05

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S254000

Reexamination Certificate

active

07145389

ABSTRACT:
A gain control circuit and a variable gain amplifier using the same. In the variable gain amplifier, gain control circuit generates a gain control voltage according to a control voltage, and a gain variable amplification unit is coupled to the gain control circuit and an input voltage to adjust an output signal output to a load according to the gain control voltage. In the gain control circuit, a level shifter with a constant current source generates a first voltage according to a control voltage. A first temperature compensation unit has a first temperature-controlled current source, and generates a second voltage according to a present operating temperature. A voltage conversion unit coupled to the level shifter and the first temperature compensation unit generates a gain control voltage according to the first and second voltages.

REFERENCES:
patent: 5994961 (1999-11-01), Lunn et al.
patent: 6300832 (2001-10-01), Okazaki
patent: 6690236 (2004-02-01), Saito

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