Digitized frequency synthesizer

Details Digitized frequency synthesizer Digitized frequency synthesizer

1978-08-29

1980-06-03

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

455113, 375120, 331 1A, 331 23, H03B 304, H03C 300, H04L 2720

Patent

active

042064252

ABSTRACT:
A frequency synthesizer including a phase lock loop comprising a voltage controlled oscillator, a four phase modulator for modulating the oscillator output signal, a phase detector for comparing the phases of a reference signal and the output signal of the modulator and filter means for supplying the phase detector output signal back to the oscillator. The two most significant bits of an arithmetic synthesizer are supplied to the modulator to produce, in the absence of additional modulating signals, discrete increments of 90.degree. phase shift in the oscillator output signal. To eliminate phase jitter, the remaining lower order bit positions of the arithmetic synthesizer are converted to analog voltages which are supplied into the phase lock loop to effect a gradual phase shift between the otherwise discrete 90.degree. phase shifts. Continuous phase, constant amplitude output signal is thereby produced having a frequency translated by the phase shifts introduced by the arithmetic synthesizer.

REFERENCES:
patent: 2540333 (1951-02-01), Hugenholtz
patent: 4006418 (1977-02-01), Liskov et al.
patent: 4021757 (1977-05-01), Nossen

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