FET band amplifier

Details FET band amplifier FET band amplifier

2006-05-16

2006-05-16

Mottola, Steven J. (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

Reexamination Certificate

active

07046086

ABSTRACT:
An FET band amplifier for reducing a residual noise during gain control. An FET band amplifier5included in an AM receiver comprises amplifiers11to15e.g. at five stages, a BPF16inserted halfway in their connection, and an AGC circuit8. The BPF16allows the passage of a component of a band wider than the amplification band of the whole of the FET band amplifier and reduces a 1/f noise by removing a low-band component of a signal output from the amplifier13at the third stage and thermal noise by removing the high-band component. This process enables a reduction in a residual noise during gain control included in a signal output from the amplifier15at the final stage.

REFERENCES:
patent: 5777516 (1998-07-01), Koifman et al.
patent: 6518843 (2003-02-01), Fujita
patent: 6870696 (2005-03-01), Cheung et al.
patent: 63-46008 (1988-02-01), None
patent: 1-137710 (1989-05-01), None
patent: 4-306922 (1992-10-01), None
patent: 7-283659 (1995-10-01), None
patent: 8-335831 (1996-12-01), None

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