In one embodiment, a signal control system has a signal output and includes: 1) a phase-locked loop (PLL) having a voltage-controlled oscillator (VCO), a phase error detector, an oscillating output coupled to the signal output of the signal control system, and a programmable frequency divider coupled in a feedback path between the oscillating output and the phase error detector; 2) at least one automatic level controller (ALC), coupled to the oscillating output; and 3) a plurality of switchable integrators, including first and second switchable integrators that are respectively coupled between the phase error detector and the VCO, and in the at least one ALC. Each of the switchable integrators is switchable between a narrow bandwidth mode that provides for stable operation of the signal control system, and a wide bandwidth mode that enables fast signal transitions at the signal output.

Title
Method and signal control system providing fast transitions in an oscillating signal
Application Number
11/897782
Publication Number
20090058548
Application Date
August 31, 2007
Publication Date
March 5, 2009
Inventor
Stephen T Sparks
Santa Rosa
CA, US
Jeffrey E Nelson
Santa Rosa
CA, US
Michael S Foster
Santa Rosa
CA, US
Michal B Krombholz
Santa Rosa
CA, US
Paul A Lameiro
Santa Rosa
CA, US
Agent
Agilent Technologies
CO, US
IPC
H03L 01/00
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