| Citation: |
Cao Zhengxin, Li Xuechu, Li Zhen, Wu Yue, Song Shugui, Xiong Shaozhen. A New High Performance FM Transmitter[J]. Journal of Semiconductors, 2007, 28(5): 655-660.
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Cao Z X, Li X C, Li Z, Wu Y, Song S G, Xiong S Z. A New High Performance FM Transmitter[J]. Chin. J. Semicond., 2007, 28(5): 655.
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A New High Performance FM Transmitter
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Abstract
A new FM transmitter is reported.It adopts a fractional-N PLL synthesizer to realize the FM modulator.An extra offset current has also been applied to eliminate the effects of the mismatch in CP.The chip is fabricated with CSMC 0.5μm DPTM CMOS technology.Experiments show that it achieves THD≤0.08% and SNR≥82dB,and the maximum outband emission energy ≤-90dBc/Hz.Furthermore,it also uses an auto frequency adjusting method to avoid tuning up the external inductances.All these merits are very suitable for FM transmission.-
Keywords:
- FM,
- fraction N frequency synthesizer,
- in-band phase noise
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References
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Proportional views
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