Patent ID: 6549078
Filing Date: 2003-04-15
Classification: H03C,H03L,Y10S

Abstract:
A method for generating a plurality of frequencies having predetermined frequency deviations from a phase lock loop device including a VCO having a main voltage input, a modulation voltage input and a frequency output, a first and second feedback loop digital divider, each having an input and an output, a phase frequency detector having a first and second input and an output, a reference frequency generator such as a crystal oscillator having an output, a first and second reference frequency digital divider, each having an input and an output, a loop filter having an input and an output, a switch having an input and a first and a second switched output, a hold circuit having an input and an output, a memory circuit for storing the main voltage input and the corresponding loop output frequency, the steps including;setting a first initial predetermined input of the first feedback loop digital divider, connecting said first switched output to the main voltage input of the VCO, supplying a first predetermined reference frequency to the first feedback loop digital divider, supplying a loop correction voltage Vr, to the main voltage input of the VCO, allowing the phase lock loop device to lock, connecting said second switched output to the modulation voltage input of the VCO, changing the input of the first feedback loop digital divider to a second input, supplying a second loop correction voltage Vj, allowing the phase lock loop device to lock, and storing a new lock voltage in the memory circuit.