PLL frequency synthesizer with circuit for changing loop filter

Details PLL frequency synthesizer with circuit for changing loop filter PLL frequency synthesizer with circuit for changing loop filter

1991-04-18

1992-05-12

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 16, 331 17, 331 25, 331DIG2, H03L 7087, H03L 7093

Patent

active

051131528

ABSTRACT:
A phase locked loop (PLL) frequency synthesizer capable of switching the output frequency thereof at high speed. The frequency synthesizer has a second phase/frequency comparator and a second variable frequency divider in addition to a first phase/frequency comparator which is included in a PLL. The synthesizer switches over the time constant of a loop filter by the output of the second phase/frequency comparator, i.e., independently of the PLL which is responsive to the output of the first phase/frequency comparator. As a result, the time constant of the loop filter is switched over at an advanced timing to thereby reduce PLL tuning time.

REFERENCES:
patent: 3421105 (1969-01-01), Taylor
patent: 3956710 (1976-05-01), Seitz et al.

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