Variable frequency reference source responsive to digital data

Details Variable frequency reference source responsive to digital data Variable frequency reference source responsive to digital data

1984-01-26

1984-09-11

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 19, 375 45, 375 62, H03K 706, H04L 2712

Patent

active

044713282

ABSTRACT:
A circuit for changing the frequency of a pulse train in response to a change in the average value of an applied digital signal applies the signal to be changed to a pulse subtractor. Application of a predetermined number of digital data signals of one sign causes the periodic subtraction of a pulse at the subtractor, thus reducing the average frequency at the output from the pulse subtractor. The signal at the output from the subtractor is applied to a pulse adder which adds a pulse to the subtracted pulse train in response to a predetermined number of data pulses of the opposite sign. The output pulse train is thus varied in frequency in respose to variation in the average value of the digital data input. The order of addition and subtraction may be reversed, and one of the functions can be performed in the feedback loop of a frequency synthesizer which receives the output pulse train as a reference signal.

REFERENCES:
patent: 3414842 (1968-12-01), Broadhead
patent: 4206424 (1980-06-01), Nossen

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