Multiband phase locked loop using a switched voltage controlled

Details Multiband phase locked loop using a switched voltage controlled Multiband phase locked loop using a switched voltage controlled

1997-08-29

1999-06-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 14, 331 16, 331 17, 331 25, H03L 7089, H03L 7099, H03L 718

Patent

active

059091495

ABSTRACT:
A multi-band phase locked loop employing multiple, switchable voltage controlled oscillators. A single PLL is provided having a different voltage controlled oscillator for each desired frequency band of operation. The transfer function of the phase detector in the phase locked loop is switched responsive to the particular band selected so as to maintain the loop natural frequency at the same point regardless of other changes in the loop transfer function that are associated with operating at alternate frequencies, such as, but not limited to, changes in the frequency slope of the voltage controlled oscillators and changes in the division ratio of the loop divider circuit.

REFERENCES:
patent: 4510461 (1985-04-01), Dickes et al.
patent: 5339050 (1994-08-01), Llewellyn
patent: 5625325 (1997-04-01), Rotzoll et al.
patent: 5686864 (1997-11-01), Martin et al.

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