Abstract:

With the AD9142 GSM wireless communication transmitter applications as examples,this article discusses the impact of sideband signals on system performance with emphasis on the theoretical analysis of the causes of interface timing errors and their contribution to the sideband signal.Improvement methods are proposed and a comparison of data before and after timing optimization is given.In order to ensure optimal performance of the DAC output,the interface timing must meet the setup and hold time requirements,which can be achieved by adjusting the baseband side of the delay.

Key words: complex modulation, DAC, orthogonal modulation, AD9142, timing