Pulse or digital communications – Receivers – Angle modulation
Patent
1994-02-10
1996-07-02
Coles, Sr., Edward L.
Pulse or digital communications
Receivers
Angle modulation
375335, 329300, 329302, H03D 300
Patent
active
055330614
ABSTRACT:
An integrated FSK detector circuit includes a first counter that receives a carrier signal and provides a multiple-bit output for reducing the frequency of the carrier signal into a plurality of weighted sub-multiples. An oscillator enable decoder circuit provides predetermined calibrate and measure pulses in response to the first counter output. A gated oscillator receives the calibrate and measure pulses and provides a burst of oscillator pulses during these time intervals. A second counter has an input coupled to the output of the gated oscillator and an up/down control terminal coupled to the output of the first counter. The output of the second counter also provides a multiple-bit output for reducing the frequency of the gated oscillator pulses. An FSK decoder logic circuit decodes the multiple-bit output of the second counter into a single bit FSK detect signal. The FSK detector circuit also includes a reset circuit coupled to the first counter for resetting between FSK detections.
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Carroll Gary T.
Pauley J. Donald
Smith Gregory M.
Yeager Michael W.
Coles Sr. Edward L.
Esposo Allan A.
Kubida William J.
Meza Peter J.
Racom Systems, Inc.
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