Amplifier circuit and wireless communication device

Details Amplifier circuit and wireless communication device Amplifier circuit and wireless communication device

2008-04-25

2010-02-23

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S051000

Reexamination Certificate

active

07667541

ABSTRACT:
An amplifier circuit has a current conversion circuit that receives a high frequency signal and produces a signal current according to the high frequency signal; a gain control circuit that includes a control signal input for receiving a control signal, a first output, and a second output, and produces the signal current from the first output or the second output according to the control signal; an impedance circuit that includes a first node connected to the first output, a second node connected to the second output, and a third node, the impedance circuit presenting a predetermined impedance between the nodes; a switch circuit that is inserted between the first output and the first node; and a load impedance unit that is connected to the first output and produces a gain signal representing an amplified high frequency signal.

REFERENCES:
patent: 5999056 (1999-12-01), Fong
patent: 6392487 (2002-05-01), Alexanian
patent: 6801089 (2004-10-01), Costa et al.
patent: 2002-519920 (2002-07-01), None

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