Voltage controlled oscillator phase locked loop circuit with...

Details Voltage controlled oscillator phase locked loop circuit with... Voltage controlled oscillator phase locked loop circuit with...

2005-11-28

2008-08-05

Lee, Benny (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S010000, C331S014000, C331S017000, C331S034000, C331S17700V, C331S179000

Reexamination Certificate

active

07408415

ABSTRACT:
A phase locked loop circuit comprises a voltage controlled oscillator with a control input to which a variable control voltage is applied and a phase-frequency discriminator with an output connected to a loop filter to produce the control voltage. To provide the phase locked loop circuit with a low loop gain and a wide frequency pulling range, a plurality of discrete capacitors is associated with the voltage controlled oscillator. A switch array selectively activates and deactivates each of the capacitors in the voltage controlled oscillator. Each number of currently activated capacitors determines one out of a plurality of partial ranges of frequencies through which the oscillator can be tuned by a variation of the control voltage in a range between predetermined upper and lower control voltage limits. A total frequency range through which the oscillator can be tuned is divided thus into a plurality of partial frequency ranges each defined by a different number of activated capacitors.

REFERENCES:
patent: 6175282 (2001-01-01), Yasuda
patent: 6888413 (2005-05-01), Adams et al.
patent: 6956416 (2005-10-01), Wilson et al.

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