Phase locked loop with low phase noise and fast tune time

Details Phase locked loop with low phase noise and fast tune time Phase locked loop with low phase noise and fast tune time

2006-04-04

2006-04-04

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331S017000, C375S376000

Reexamination Certificate

active

07023249

ABSTRACT:
A phase locked loop with fast tune time and low phase noise contains a fast filter and a slow filter connected to a phase detector. The slow filter filters an error signal with a narrow bandwidth and provides a slow filter tune voltage. An integrator is connected to the slow filter for integrating the slow filter tune voltage and providing a tune voltage to a VCO. The integrator has a capacitor and operational amplifier. The fast filter filters and amplifies the error signal with a wide bandwidth and high gain to provide a fast filter tune voltage. A diode is connected to the fast filter output and to a non-inverting input of the operational amplifier. The diode is forward biased when the fast filter tune voltage is sufficient thereby causing an inverting input of the operational amplifier to change to the same level to rapidly change capacitor charge.

REFERENCES:
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patent: 5774023 (1998-06-01), Irwin
patent: 6064273 (2000-05-01), Donohue
patent: 6611176 (2003-08-01), Goldman

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