Patent ID: 8125277

Claim:
A frequency synthesizer for providing a first output signal in the 2-8 GHz range, the frequency synthesizer comprising: a fractional loop having a first output for providing a second output signal, the fractional loop including a fractional divider, the fractional divider having a fractional divider input coupled to the first output and a fractional divider output coupled to a first input of a first detector, a second input of the first detector being coupled to a reference signal, wherein the reference signal has a reference frequency less than 40 MHz, wherein an output of the first detector provides a first control signal to a first oscillator, the first oscillator providing the second output signal; and an integer loop having a first input coupled to receive the second output signal and a second output for providing the first output signal, the integer loop including a first integer divider, the first integer divider having a first integer divider input coupled to the first input of the integer loop and a first integer divider output coupled to a first input of a second detector, a second input of the second detector being coupled to receive a second integer divider output signal of a second integer divider, a second integer divider input of the second integer divider being coupled to receive the first output signal, wherein an output of the second detector provides a second control signal to a second oscillator, the second oscillator providing the first output signal.