Back to results
US 2009/0267697 A1Published application
Frequency synthesizer using a phase-locked loop and single side band mixer
AssigneeScientific Components Corporation
InventorDoron Gamliel
Life of this patent
Estimating the term…
Abstract
A frequency synthesizer is built using a phase locked loop incorporating a single side band mixer in the input. The single side band mixer is preferably realized with digital logic and FETs, and the resulting frequency synthesizer simultaneously improves control over the frequency resolution, noise floor and operating frequency range.
Claims13
A frequency synthesizer comprising:
- a phase-locked loop (PLL) with a feedback loop and a frequency output;
- said PLL having a phase and frequency detector, said phase and frequency detector with a reference divider input path and an integer divider input path;
- said integer divider input path being in said feedback loop of said PLL;
- a reference oscillator connected to said reference divider input path;
- a single side band (SSB) mixer having an intermediate frequency (IF) input and a local oscillator (LO) input and producing a signal frequency (RF) output signal;
- and,
- said RF output signal forming at least a portion of said reference divider input path.
4 more elements
2-14. (canceled)
A frequency synthesizer comprising:
- an SSB mixer connected to an IF signal and an LO signal and producing an RF signal;
- a reference oscillator producing said LO signal
- an intermediate divider connected to said LO signal and producing said IF signal;
- a reference divider connected to said RF signal and producing a reference divider output;
- a phase and frequency detector connected to an integer divider output and said reference divider output and producing a phase and frequency detector output;
- a loop filter connected to said phase and frequency detector output and producing a loop filter output;
- a VCO connected to said loop filter output and producing a VCO output, said VCO output also being a frequency output for said frequency synthesizer;
- and,
- an integer divider connected to said VCO output and producing said integer divider output.
6 more elements
Dependencies are inferred from the claim text.