Variable gain wideband amplifier

Details Variable gain wideband amplifier Variable gain wideband amplifier

2007-09-25

2007-09-25

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S294000, C330S149000

Reexamination Certificate

active

11292208

ABSTRACT:
The invention relates to a feedback or feedforward type variable gain wideband amplifier. The variable gain wideband amplifier includes a feedback-type inversion amplifier circuit310for amplifying input Vin, a feedback-type non-inversion amplifier circuit320for amplifying input Vin, a power source circuit330for controlling the gain of the non-inversion amplifier circuit320and a load circuit340connected between a junction of output terminals of the inversion and non-inversion amplifier circuits310and320and power voltage potential VDD to control the gain of the amplifier circuits310and320.The variable gain wideband amplifier of the invention is feedforward type, and outputs signals from the inversion and non-inversion amplifier circuits310and320via a single output terminal in order to attenuate third order intermodulation frequency IM3generated from the amplifier circuits310and320.Then, predetermined frequencies f1and f2included in the input signal are amplified.

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patent: WO 2004/027988 (2004-04-01), None

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