Patent ID: 7072420
Filing Date: 2006-07-04
Classification: H03F,H04L

Abstract:
1. A method of adjusting timing of amplitude and phase components in an output Radio Frequency (RF) signal, the method comprising: generating amplitude and phase signals from input data; adjusting the generated amplitude and phase signals to produce adjusted amplitude and phase signals; supplying the adjusted amplitude and phase signals to a radio frequency circuit; and transmitting an output RF signal from the radio frequency circuit, wherein adjusting the generated amplitude and phase signals comprises: detecting an output RF signal to produce detected amplitude and phase signals; delaying the generated phase signal by a first time delay amount to produce a delayed phase signal, the first time delay amount being such as to minimize a difference between the delayed phase signal and the detected phase signal; delaying the generated amplitude signal by a second time delay amount to produce a delayed amplitude signal, the second time delay amount being such as to minimize the difference between the delayed amplitude signal and the detected amplitude signal; using the first and second time delay amounts to determine a third time delay amount and a fourth time delay amount; and adjusting the generated phase signal in dependence upon the third time delay amount to produce the adjusted phase signal and adjusting the generated amplitude signal in dependence upon the fourth time delay amount to produce the adjusted amplitude signal, wherein the third and fourth time delay amounts together are such as to compensate for a time delay between the detected phase and detected amplitude signals.