Feedback-type variable gain amplifier and method of...

Details Feedback-type variable gain amplifier and method of... Feedback-type variable gain amplifier and method of...

2007-05-25

2009-12-15

Nguyen, Khanh V (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S254000, C330S278000, C330S260000

Reexamination Certificate

active

07633337

ABSTRACT:
A feedback-type variable gain amplifier including a first field effect transistor, a feedback circuit, and a load circuit. The first field effect transistor receives an input voltage signal through an input node, amplifies the input voltage signal, and outputs the amplified input voltage signal through an output node. The feedback circuit is coupled between the input node and the output node, and generates feedback impedance that is changed in response to a control signal. The load circuit is coupled between the output node and a voltage source, and generates load impedance that is changed in response to the control signal to cancel a change of input impedance due to a change of the feedback impedance. Therefore, since the input impedance is not changed when the gain of the amplifier is changed, a voltage standing wave ratio is good, and a range of gain control is broad.

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Aly Ismail and Asad A. Abidi, “A 3-10-GHz Low-Noise Amplifier With Wideband LC-Ladder Matching Network” IEEE Journal of Solid-State Circuits, vol. 39, No. 12, Dec. 2004.

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