FET band amplifier

Details FET band amplifier FET band amplifier

2006-05-23

2006-05-23

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

C330S311000

Reexamination Certificate

active

07049895

ABSTRACT:
An FET band amplifier for providing a high gain. An FET band amplifier5included in an AM receiver comprises amplifiers11to15e.g. at five stages and a BPF16inserted halfway in their connection. Each of the amplifiers11to15acts as a differential amplifier comprising a p-channel FET as an amplification element. 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 the low-band component of a signal amplified by the amplifiers11to13at three stages and thermal noise by removing the high-band component. Thus, each of the amplifiers14, 15connected to the rear stage of the BPF16is not saturated by a noise component.

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