Circuit for finding the frequency band of an input signal which

Details Circuit for finding the frequency band of an input signal which Circuit for finding the frequency band of an input signal which

1993-05-21

1995-04-25

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 49, H03K 906

Patent

active

054101964

ABSTRACT:
An object of the present invention is enhancing a capability of integration of a frequency finding circuit for finding a frequency of an input signal. A signal sampling circuit (21), sampling the input signal, utilizes a sampling signal (G) to convert the input signal into a sampled input signal (S) and inputs it to the frequency finding circuit. A resultant signal (K) from the frequency detecting circuit represents a specific frequency component contained in the input signal and is compared with a specified threshold value by a voltage comparator (25). Although a deciding signal (P) is produced as a result of the comparing, it contains unrequired components other than a sampling period. In order to eliminate the needless components, after sampling the deciding signal (P) in accordance with the sampling signal (G) again, an output circuit (50) latches it. The output circuit (50) includes a latch circuit (26) operating in accordance with the sampling signal G. Since the latch circuit is substitutional for a prior art sample/hold circuit, a capacitor and an external terminal connecting it, both of which are required by the sample/hold circuit, are no longer needless.

REFERENCES:
patent: 5180935 (1993-01-01), Abdi et al.
patent: 5189378 (1993-02-01), Arai
patent: 5258720 (1993-11-01), Tanis et al.

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