Digital down Conversion Processing Based on HSP50016
Gong Yao-huan · Systems engineering and electronics · 2003
In digital signal processing,it is necessary to convert intermediate frequency signals to baseband signals before the further processing. But any gain error or phase error between in-phase (I)path and quadrature phase (Q)path in the system will cause hermitian image interference and degrade the performance of the system. The analog methods will make system more complex. The effect of the gain and phase errors on Hermitian image rejection is investigated. The DDC chip is adopted in the system to convert IF signals to baseband signals. The experimental results illustrate that this method is effective in Hermitian image rejection.