Variable-bandwidth loop filter methods and apparatus

Details Variable-bandwidth loop filter methods and apparatus Variable-bandwidth loop filter methods and apparatus

2005-12-22

2008-10-14

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S152000, C327S158000, C327S558000, C327S553000

Reexamination Certificate

active

07436228

ABSTRACT:
Methods and apparatus are provided for varying the bandwidth of a loop filter in a loop circuit (e.g., a phase-locked loop circuit). The loop filter can include first and second resistor circuitries coupled to a capacitor. One of the resistor circuitries can be coupled to an output of the loop circuit in response to selection of a mode of operation. The resistor circuitries can each include a plurality of resistors that can be selectively coupled in series to the capacitor or bypassed. In addition, the output of the loop circuit can be coupled to a second capacitor. Either or both of the capacitors can be programmable.

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