Frequency modulated modem transmitter

Details Frequency modulated modem transmitter Frequency modulated modem transmitter

1985-11-07

1987-06-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

455113, 331 1R, 332 19, H03C 309

Patent

active

046708880

ABSTRACT:
A frequency modulated transmitter including a reference frequency source providing a reference frequency to a phase locked loop circuit. The phase locked loop circuit provides a frequency output signal stabilized in accordance with this reference frequency and in accordance with a feedback signal. The phase locked loop circuit further includes a data input circuit that adjusts the output frequency in accordance with input data. Also included is the feedback circuit that provides the feedback signal to the phase locked loop circuit. This feedback circuit is derived from the frequency output signal. A synchronization circuit is connected to the feed back circuit and synchronizes the output of the feedback circuit with the reference frequency signal and the input data.

REFERENCES:
patent: 4068199 (1978-01-01), Madoff
patent: 4471328 (1984-09-01), Chapman
patent: 4481489 (1984-11-01), Kurby
patent: 4567603 (1986-01-01), Howell et al.
Millman & Halkias, Integrated Electronics: Analog and Digital Circuits and Systems, McGraw-Hill, 1972, pp. 636-647.

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