Amplifier circuit and method

Details Amplifier circuit and method Amplifier circuit and method

2005-08-23

2005-08-23

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

C330S086000, C250S2140AG

Reexamination Certificate

active

06933786

ABSTRACT:
An amplifier system has a control circuit. An amplifier is coupled to the control circuit and has a controllable gain. A controllable input impedance circuit is coupled to the control circuit. When the gain of the amplifier is changed the controllable input impedance circuit's impedance is adjusted, so that the input impedance to the system remains essentially constant.

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patent: 4563656 (1986-01-01), Baum
patent: 5532471 (1996-07-01), Khorramabadi et al.
patent: 5734300 (1998-03-01), Yoder
patent: 5812030 (1998-09-01), Inami et al.
patent: 6229395 (2001-05-01), Kay
patent: 6246282 (2001-06-01), Oono et al.
patent: 6303922 (2001-10-01), Kasper

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