Patent ID: 8289096

Claim:
A circuit, comprising: a controller to provide one or more control signals indicative of a digital data stream to be transmitted; a voltage-controlled or digitally-controlled oscillator (VCO-DCO) downstream of the controller and coupled to the controller via a phase modulation control path; and a 180Â° phase shift module downstream of the VCO-DCO and coupled to the controller via a 180Â° phase shift control path, wherein the 180Â° phase shift module comprises: a counter having a first input coupled to an output of the VCO-DCO, a second input coupled to the 180Â° phase shift control path, and an output; a gating module having a first input coupled to the output of the VCO-DCO, a second input coupled to the output of the counter, and an output; and a variable divider having an input coupled to the output of the gating module.