Amplifier circuit

Details Amplifier circuit Amplifier circuit

2008-03-28

2009-11-03

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000

Reexamination Certificate

active

07612611

ABSTRACT:
An amplifier circuit for amplifying a high-frequency input signal comprises an amplifier stage, which amplifies the high-frequency input signal as a function of an operating point of the amplifier stage and generates an operating point-dependent signal, an observer stage, which replicates the amplifier stage and generates an observation signal, a regulator, which is supplied with the operating point-dependent signal and the observation signal, and an control element, which influences the operating point of the amplifier stage and is driven by the regulator, whereby the regulator drives the control element in such a way that the operating point of the amplifier stage is substantially independent of a level of the high-frequency input signal.

REFERENCES:
patent: 6930555 (2005-08-01), Bachhuber et al.
patent: 7113043 (2006-09-01), Jin et al.
patent: 7167045 (2007-01-01), Son et al.
patent: 7184799 (2007-02-01), Jin et al.

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