Frequency mode selection discriminator and low pass filter

Details Frequency mode selection discriminator and low pass filter Frequency mode selection discriminator and low pass filter

2011-04-26

2011-04-26

Mis, David (Department: 2817)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

C327S046000, C327S047000, C327S049000, C327S165000, C327S166000

Reexamination Certificate

active

07932751

ABSTRACT:
A circuit is described that detects high and low frequencies and additional clock frequencies and outputs a signal that indicates a high, a low frequency or an additional mode. When in the low frequency low frequency mode signals are regenerated free of any high frequency signals from appearing on the filtered low frequency clock line. The rising and falling edges of the input clock are low pass filtered separately and then combined to generate a low frequency clock or the additional input clock and that retains the input clock pulse width and duty cycle.

REFERENCES:
patent: 4847577 (1989-07-01), Gerhart et al.
patent: 5682113 (1997-10-01), Park et al.

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