Jumpless Phase Modulation In A Polar Modulation Environment

A modulation circuit, comprising:

• a phase shifter configured to selectively shift a phase of a baseband phase signal in accordance with a zero crossing signal to output a selectively phase-shifted signal;
• a phase-lock loop configured to provide a phase modulation signal in accordance with the selectively phase-shifted signal;
• a variable controlled oscillator configured to provide a differential phase modulated signal in accordance with the phase modulation signal, the differential phase modulated signal provided by way of a first node and a second node;
• and
• a switch configured to selectively route the differential phase modulated signal from the first node and the second node to a third node and a fourth node in accordance with the zero crossing signal.

A method, comprising:

• selectively shifting a phase of a baseband phase signal in accordance with a zero crossing signal to output a selectively phase-shifted signal;
• deriving a phase modulated radio frequency carrier signal from the selectively phase-shifted signal;
• and
• selectively inverting the phase modulated radio frequency carrier signal in accordance with the zero crossing signal.

An apparatus, comprising:

• a source of electrical energy;
• and
• an electronic circuit coupled to the source of electrical energy, the electronic circuit configured to:
• selectively shift a phase of a baseband phase signal in accordance with a zero crossing signal to output a selectively phase-shifted signal;
• derive a phase modulated carrier signal from the selectively phase-shifted signal;
• selectively invert the phase modulated signal in accordance with the zero crossing signal;
• derive an amplitude modulated signal from a baseband amplitude signal;
• and
• mix the selectively inverted phase modulated carrier signal with the amplitude modulated signal so as to derive a polar modulated carrier signal.