Log-linear variable gain amplifiers and amplifier control appara

Details Log-linear variable gain amplifiers and amplifier control appara Log-linear variable gain amplifiers and amplifier control appara

1999-07-26

2000-12-19

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327362, G06F 7556

Patent

active

061631981

ABSTRACT:
Log-linear variable gain amplifiers and amplifier control apparatus and methods providing temperature compensated log-linear gain characteristics with a wide range of control for a current steered variable gain amplifier. The invention provides the sum of scaled linear and exponential terms, proportional to absolute temperature and responsive to an input control voltage. The sum of these terms is applied to a current steered variable gain amplifier to provide the desired log-linear variable gain control. Various embodiments are disclosed.

REFERENCES:
patent: 5570055 (1996-10-01), Gilbert
patent: 5572166 (1996-11-01), Gilbert
patent: 5610547 (1997-03-01), Koyama et al.
patent: 5672961 (1997-09-01), Entrikin et al.
patent: 5677561 (1997-10-01), Jensen
patent: 5684431 (1997-11-01), Gilbert et al.
patent: 5748027 (1998-05-01), Cargill

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