Digital frequency shift-keyed transmitter

Details Digital frequency shift-keyed transmitter Digital frequency shift-keyed transmitter

1975-04-10

1977-08-02

Safourek, Benedict V.

Oscillators

Relaxation oscillators

328 59, 331179, H04B 104

Patent

active

040399524

ABSTRACT:
The square-wave output of a comparator is coupled back to the input of an RC controlled integrator including an operational amplifier and an inverter circuit with an output signal maintained at a predetermined level. The RC network sets the pulse repetition rate of the square wave. The inverter and integrator outputs are connected to separate inputs of the comparator. A gating circuit couples a data source to the operational amplifier. In particular, the gating circuit couples an additional square-wave current to the integrator via a resistor. The square-wave current may be in phase and raise the pulse repetition rate of the resulting square wave or out of phase and lower the pulse repetition rate.

REFERENCES:
patent: 3826999 (1974-07-01), Williford
patent: 3914712 (1975-10-01), Currie
Jackson, "Analog Computation," (1960), pp. 47, 640.

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