Adaptive radio transceiver with offset PLL with subsampling mixers

A phase lock loop, comprising:

• a tunable oscillator having a tuning input;
• a subsampling mixer having coupled the oscillator;
• and
• a phase detector having a first input coupled to the mixer, a second input adapted to receive an input signal, and an output coupled to the tuning input.

A phase lock loop, comprising:

• oscillator means for generating a first signal having a tunable frequency, the oscillating means comprising tuning means for tuning the frequency of the first signal;
• mixer means for mixing the first signal with a second signal to produce a mixed signal;
• filter means for filtering the mixed signal to generate a difference signal between the frequency of the first signal and a harmonic of the second signal;
• and
• detector means for detecting a phase difference between the filtered mixed signal and an input signal, and generating an error signal which is a function of the phase difference, the tuning means being responsive to the error signal.

A method of upconverting an input signal, comprising:

• generating a first signal having a tunable frequency;
• mixing the first signal with a second signal to produce a mixed signal;
• filtering the mixed signal to generate a difference signal between the frequency of the first signal and a harmonic of the second signal;
• generating an error signal as a function of a phase difference between the mixed signal and the input signal;
• and
• tuning the first frequency with the error signal.