Frequency synthesizer and related method for generating wideband signals

A frequency synthesizer, comprising:

• a signal reference circuit that generates a signal reference;
• a first phase-locked loop circuit path connected to said signal reference circuit and comprising,
• a phase-locked loop circuit having an output;
• a frequency divider connected to the output of the phase-locked loop circuit for receiving the signal therefrom and dividing the frequency of the signal;
• and
• a tunable bandpass filter connected to said frequency divider that is tuned for selecting a harmonic frequency to obtain a fractional frequency division to produce a local oscillator signal used for a first frequency specific digital television application;
• and
• a second phase-locked loop circuit path connected to said signal reference and comprising,
• a phase-locked loop circuit having an output;
• a direct digital synthesizer connected to said phase-locked loop circuit;
• and
• a mixer connected to said direct digital synthesizer and receiving a digital television service signal for mixing with signals for said direct digital synthesizer and producing a local oscillator signal used for a second frequency specific digital television application.

A method for generating wideband low phase noise signals, comprising:

• receiving a reference signal within a phase-locked loop circuit and producing an output therefrom;
• dividing the frequency of the signal output from the phased-lock loop circuit within a frequency divider;
• and
• selecting a harmonic frequency of the signal that has been divided within a tunable bandpass filter to obtain an integer or fractional frequency division for the signal output from the phased-lock loop circuit.