Design of a Point Frequency Source Based on SRD

With the increasing demand for frequency synthesizers in wireless communication, the frequency multiplier has gradually become a general solution due to its characteristics. In this paper, a point frequency source based on the step recovery diode (SRD) is designed. Firstly, the parameter characteristics of the step recovery diode are analyzed, and the component values of frequency multiplier circuit are optimized by harmonic balance method. Then, according to the output spectrum of frequency multiplier circuit, the band pass filter is designed by using the Generalized Chebyshev function. Finally, the miniaturization design is realized through the hybrid assembly process of electronic assembly and micro assembly with a small physical size, only
$40\text{mm}\times40\text{mm}\times 12.8\text{mm}$
. The output frequency is 8.5 GHz, the output power is 12.01dbm, the phase noise is −115.13 dBc/Hz@1kHz and the spurious suppression is less than −85dBc, which achieve the advanced level in country and meet the technical requirements of the frequency synthesizer for the point frequency source. By the way, by changing the pass band of the band pass filter and selecting the appropriate MMIC frequency multiplier, the output band can be covered to 0.2- 40 GHz, which has a very broad application prospect.