Method and system for adjusting the level of the parasite spectral lines of the frequency spectrum of the output of a frequency-changing device has a single frequency band lateral, in particular, incorporated in a mobile telephone,

摘要

The mixer spurious harmonics reduction method has test signal parameters (TXI,TXQ) applied with phase shifting to the I and Q input ports of the mixer. The test parameters are set so as to cover a range of values. Knowledge of the parabolic curve followed by the output values then allows a microprocessor to find an optimum solution, and set the mixer to these values.