Patent ID: 7522676

Claim:
A method comprising: conveying a test signal to a radio-frequency path and an envelope path in a radio-frequency transmitter for obtaining a first further signal indicative of the test signal from an end of the radio-frequency path, and a second further signal indicative of the test signal from an end of the envelope path, the test signal having a periodic waveform, wherein the radio-frequency transmitter comprises a receiving end configured for receiving baseband data, the transmitter further configured for conveying a first signal and a second signal based on the received baseband data, wherein the first signal is conveyed in the radio-frequency path for obtaining a phase-modulated radio-frequency signal indicative of the first signal at the end of the radio-frequency path, and the second signal is conveyed in the envelope path for obtaining an envelope signal indicative of the second signal at the end of the envelope path, and wherein the phase-modulated radio frequency signal is provided to an input of a power amplifier for transmission, and the envelope signal is provided to a voltage supply of the power amplifier; obtaining a demodulated waveform signal having a peak-to-peak amplitude at least based on the first further signal; and adjusting a propagation delay in one of the radio-frequency path and the envelope path to minimize the peak-to-peak amplitude.