Frequency modulation in phase-locked loops

Details Frequency modulation in phase-locked loops Frequency modulation in phase-locked loops

1987-12-22

1989-03-07

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 18, 332 23R, 455113, 455119, H03C 309

Patent

active

048109770

ABSTRACT:
A phase-locked loop (PLL) frequency synthesizer having an analog, out-of-band component path and a digital, in-band component path to provide frequency modulation (FM) of the synthesized output signal is described. The in-band FM component is octave scaled by an analog scaling means and coupled to an analog-to-digital converter to provide a digital number to be decade added to the PLL divide number to change the PLL frequency in response to the in-band FM signal. The out-of-band FM component is also scaled and applied to a loop summing node and summed with the PLL error signal to vary the PLL frequency. The scaling in both the in-band component path and out-of-band component path is equalized to provide a flat frequency response. Additional, the in-band component is scaled to allow use of the analog-to-digital converter over its maximum range to maintain a high signal-to-noise ratio.

REFERENCES:
patent: 4543542 (1985-09-01), Owen

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