Method and apparatus for modulating a phase locked loop

Details Method and apparatus for modulating a phase locked loop Method and apparatus for modulating a phase locked loop

1979-07-13

1980-12-30

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 23, 331 25, 332 19, H03C 308, H03C 309

Patent

active

042426499

ABSTRACT:
A phase locked loop provides frequency modulation over an extended frequency range by summing a modulation signal with the loop signal at two separate points within the loop. The modulation signal is directly applied to the control input terminal of the voltage controlled oscillator. In addition, the modulation signal is processed to compensate for the transfer functions of loop components, and the processed signal is summed with the loop signal at an additional point between the output terminals of the phase detector and the lowpass filter of the loop. The processing of the modulation signal consists of preshaping of the signal to compensate for the transfer functions of loop circuitry located between the voltage controlled oscillator and the summing junction.

REFERENCES:
patent: 3414842 (1968-12-01), Broadhead, Jr.
patent: 3810046 (1974-05-01), Lance
patent: 4052672 (1977-10-01), Enderby et al.

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