Interpolating phase-locked loop frequency synthesizer

Details Interpolating phase-locked loop frequency synthesizer Interpolating phase-locked loop frequency synthesizer

1991-01-07

1992-01-07

Grimm, Siegfried H.

Oscillators

With distributed parameter resonator

Parallel wire type

331 25, H03L 718

Patent

active

050795201

ABSTRACT:
The invention concerns are interpolating frequency synthesizer based on digital phase locking, with which frequencies can be produced which lie between frequencies defined by integer divisors. Traditional frequency synthesizers employ frequency dividers in which the dividing ratio is an integer. The circuit of the invention comprises member (8, 9), in one of which the reference frequency (f.sub.o) or the VCO frequency (f.sub.x), or the frequency obtained from them by division, is multiplied with a coefficient L and in the other member the corresponding frequency is multiplied by L+ .DELTA.L; and members (2, 7), in which the first pulses going to the phase detector (3) are lengthened by a time corresponding to a given integer number k1 of pulses formed in the number (8), and the other pulses are lengthened by a time corresponding to a given integer number k2 of pulses formed in the member (9).

REFERENCES:
patent: 4611230 (1986-09-01), Nienaber
patent: 4868524 (1989-09-01), Costlow et al.

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