Variable-gain differential input and output amplifier

Details Variable-gain differential input and output amplifier Variable-gain differential input and output amplifier

2005-06-14

2005-06-14

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000, C330S278000

Reexamination Certificate

active

06906588

ABSTRACT:
A variable-gain amplifier with a differential input and differential output, including an attenuator block, receiving an input voltage and providing, on several outputs, voltages, each of which is equal to the attenuated input voltage; differential transconductor elements, each having a first input connected to a respective output of the attenuator block, and generating first and second positive currents and first and second negative currents; a current source assembly adapted to controlling the transconductance of each differential transconductor element according to an analog control signal; and an output block converting first and second input currents into a differential output voltage and providing a second input of each differential transconductor element with a feedback voltage depending on the output voltage.

REFERENCES:
patent: 5684431 (1997-11-01), Gilbert et al.
patent: 5880618 (1999-03-01), Koen
patent: 5917380 (1999-06-01), Darthenay et al.
patent: 6141169 (2000-10-01), Pietruszynski et al.
patent: 6704560 (2004-03-01), Balteanu et al.
patent: 6763228 (2004-07-01), Prentice et al.
patent: 6784651 (2004-08-01), Mouret et al.
patent: WO 00/72446 (2000-11-01), None

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