Design of Local Oscillator Based on DDS of High Performance Short-Wave Receiver

Abstract:

Phase noise and spurious signals of local oscillator will affect the performance of short-wave receiver. The structure of receiver's front-end part based on DDS is introduced to realize a high-performance local oscillator of short-wave receiver. Then measures were taken to improve the LO's performance, including using external directly frequency multiplier as DDS' clock to improve the purity of frequency spectrum, tracking filter to degrade harmonics and gain control circuit to remain constant amplitude in the desired frequency range. At last, test results show that the above-mentioned measures improve the receiver's performance.

• Periodical: Advanced Materials Research (Volumes 834-836)
• Pages: 1140-1144
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.834-836.1140
• Online since: October 2013
• Authors: Yong Tai Chen, Chang Jing Sun, Bin Zang, Long Cheng, Jing Tang, Yang Huang, Dong Hui Xu
• Keywords: DDS, Gain Control, Local Oscillator, Phase Noise, Spurious Signals, Tracking Filter

References

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DOI: 10.1109/sibcon.2011.6072623

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