The design of tester for frequency characteristic based on the DDS
Abstract: In the paper, the digital tester for frequency response characteristic based on the high performance DDS chip AD9858 is presented. The signal generator of sweep frequency is based on DDS device AD9858, the signal measuring circuit is based on gain and phase detector AD8302 ,the real-time control and deal circuit is based on TMS320VC5409 of DSP chip. The system can generate sweep frequency signal with the frequency range from 10-6Hz to 300MHz, and with the power range from -55dBm to+18dBm. Digital and miniaturization be fulfilled in the design of the frequency characteristic, the bulk and weight of the instrument will be greatly reduced. The instrument provides many kinds of periphery interface, make it very convenient to use.
Key words: DDS ; Amplitude Frequency Characteristic ;DSP ;Testing Meter