Variable gain amplifier circuit

Details Variable gain amplifier circuit Variable gain amplifier circuit

2003-04-11

2008-05-27

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S053000, C327S054000, C330S134000, C330S254000, C330S282000, C330S284000

Reexamination Certificate

active

07378881

ABSTRACT:
Embodiments of a variable gain amplifier circuit are described. In one embodiment, multiple resistor devices are coupled in series to form a string of resistor devices and to receive an input current. A multiple input operational amplifier device has an amplifier output coupled to a feedback resistor in the string of resistor devices and multiple amplifier input pairs, each amplifier input being coupled into the string of resistor devices as a tap between two respective adjacent resistors, each amplifier input pair being controlled by a corresponding bias current transmitted from a respective bias current source.

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patent: 5550507 (1996-08-01), Horl
patent: 6304142 (2001-10-01), Madni
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patent: 6608527 (2003-08-01), Moloudi et al.
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patent: 7005922 (2006-02-01), Oshima et al.
patent: 7046089 (2006-05-01), Kwon et al.
patent: 2006/0132235 (2006-06-01), Ozawa

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