Limit circuit

Details Limit circuit Limit circuit

2008-05-06

2008-05-06

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000

Reexamination Certificate

active

07368981

ABSTRACT:
A limit circuit capable of providing high gain. The limit circuit included in an FM receiver comprises, for example, seven amplifiers (11to17), and a BPF (18) inserted substantially in the middle thereof. Each of the amplifiers (11to17) operates as a differential amplifier, and has a gain of about 13 dB. The BPF (18) serving as a limit circuit passes components in a bandwidth wider than the bandwidth of the signal to be amplified. The level of 1/f noise and heat noise can be reduced by eliminating low-frequency components and high-frequency components of the Signal amplified by the four amplifiers (11to14), respectively. Therefore, each of the amplifiers (15to17) connected to the rear end of the BPF (18) is not animated by the noise component.

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