Apparatus and method for determining when the frequency of an al

Details Apparatus and method for determining when the frequency of an al Apparatus and method for determining when the frequency of an al

1992-05-01

1995-08-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 33, 327 37, H03K 906

Patent

active

054463220

ABSTRACT:
A frequency-responsive integrated circuit (IC) for determining when the frequency of a clock pulse input signal is below a predetermined threshold level, the IC including a capacitor charged up at a nearly constant rate by a current source. If the capacitor voltage reaches one-third of the DC power voltage, and input pulses are received, the capacitor is discharged to start another charge-up cycle. If no input pulses were received, the capacitor continues to charge up until its voltage reaches two-thirds of the DC power voltage, at which point an output signal is produced indicating that the input frequency is below the predetermined threshold level.

REFERENCES:
patent: 3940760 (1976-02-01), Brokaw
patent: 4222095 (1980-09-01), Stein
patent: 4746820 (1988-05-01), Fey
patent: 4799024 (1989-01-01), Fischer
patent: 4890248 (1989-12-01), Reinhardt
patent: 5059890 (1991-10-01), Yoshikawa et al.
patent: 5126653 (1992-06-01), Ganesan et al.

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