General Description

The local oscillator unit based on the hybrid synthesized topology in which the DDS generates 1.8888MHz frequency from 10MHz reference and then phase locked loop Is used to up convert the frequency to 1888.8MHz. 188.88MHz. frequency is generated By dividing the carrier by using SP8910. The isolation between the two channels is 30dB with phase unbalance of 3 0. The DDS here is implemented by using CPLD for the fixed frequency. The DDS can also be programmed.