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Journal of Shanghai University（Natural Science Edition）

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Design of 2.4～2.5 GHz Frequency Source Controlled by I 2C-Bus

WANG Xiang-yong, LI Ming-xiang, GE Jian-min, HAN Jian-guo, DING Zong-wen   

  1. School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China

  • Received:2005-06-01 Revised:1900-01-01 Online:2006-06-30 Published:2006-06-30
  • Contact: LI Ming-xiang

Abstract:

S-band phase locked model frequency synthesizers are summarized. The frequency range is from 2.4 to 2.5 GHz with a 4 MHz step. The phase noise is ￡(100 kHz) <-110 dBc/Hz. The frequency synthesizer uses an I 2C-bus to control a series of parameters of phase locked loop via a 51-series microcontroller. The division ratio of feedback signal of VCO is realized through software programming instead of traditional PC control, making applications more convenient. This circuit is featured by small size and easyadjustment of operating frequency.

Key words: loop filter, PLL, TSA5059, VCO, I 2C-bus