State machine with hysteresis for detecting frequency of an inpu

Details State machine with hysteresis for detecting frequency of an inpu State machine with hysteresis for detecting frequency of an inpu

1993-09-13

1995-08-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 48, 327 49, 327113, H03B 706

Patent

active

054402522

ABSTRACT:
The state machine with hysteresis provided in the invention includes a current state circuit and a next state control circuit. The current state circuit, in response to a clock signal and a control signal, generates a current state signal and a frequency detection signal. The current state signal has a plurality of bits. The next state control circuit, in response to the current state signal and the input signal, generates the control signal. A hysteresis is observed with regard to the relation of the frequency detection signal with respect to the frequency of the input signal.

REFERENCES:
patent: 3626307 (1971-12-01), Koyama
patent: 4020422 (1977-04-01), Underhill
patent: 4267514 (1981-05-01), Kimsey
patent: 4451794 (1984-05-01), Yamada
patent: 4618920 (1986-10-01), Fox
patent: 5059833 (1991-10-01), Fujii

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