Digital frequency discriminator

Details Digital frequency discriminator Digital frequency discriminator

1996-10-30

1998-10-27

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

327 1, 329303, H04L 2714

Patent

active

058282386

ABSTRACT:
A frequency discriminator circuit that includes a signal shaping and power splitting circuit (20) responsive to a sinusoidal RF input signal for providing first and second substantially identical squarewave outputs having the same frequency as the sinusoidal RF signal, a digital delay line (19) responsive to the first squarewave output for providing a delayed replica of the first squarewave output, an exclusive OR gate (21) responsive to the second squarewave output and the delayed replica of the first squarewave output, low pass filters (23, 25) for averaging each of the inverted and non-inverted outputs of the exclusive OR gate, and a differential amplifier (27) for subtracting the outputs of the low pass filters from each other and providing an output indicative of the frequency of the RF input signal.

REFERENCES:
patent: 3778727 (1973-12-01), Williams
patent: 4055814 (1977-10-01), Abraham et al.
patent: 5053649 (1991-10-01), Johnson

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