Citation: |
Yin Yadong, Chen Jie, Wang Haiyong. A Band III PLL Frequency Synthesizer[J]. Journal of Semiconductors, 2008, 29(6): 1216-1222.
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Yin Y D, Chen J, Wang H Y. A Band III PLL Frequency Synthesizer[J]. J. Semicond., 2008, 29(6): 1216.
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A Band III PLL Frequency Synthesizer
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Abstract
A band III PLL Frequency Synthesizer is integrated in a 0.18μm 1.8V CMOS process,except for the tuned inductor and loop filter.Some functions such as selecting the sub-band of the VCO,configuring the currents of the charge pump and VCO etc,can be performed by using the SPI bus.An improved band-switching circuit is adopted to save band-switching time.As the measurement results show,the total power of the frequency synthesizer is 34mW;the frequency range of frequency synthesizer’s output is 143~271Mhz.The phase noise in band III can reach -83dBc/Hz@10kHz,-104dBc/Hz@100kHz and the reference spur is less than -70dBc.This new band-switching circuit can save band-switching time in comparison with the normal one. -
References
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Proportional views