A CMOS 2.4GHz Low Spurious and Quadrature output frequency synthesizer
碩士 === 國立交通大學 === 電子工程系 === 91 === A design of 2.4GHz CMOS charge pump and quadrature phase generator used in integer-N frequency synthesizer is described in this thesis. A charge pump that has been presented is also realized in this thesis. This charge pump with perfect current matching...
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| Format: | Others |
| Language: | en_US |
| Published: |
2003
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| Online Access: | http://ndltd.ncl.edu.tw/handle/54963457030947587272 |
| Summary: | 碩士 === 國立交通大學 === 電子工程系 === 91 === A design of 2.4GHz CMOS charge pump and quadrature phase generator used in integer-N frequency synthesizer is described in this thesis.
A charge pump that has been presented is also realized in this thesis. This charge pump with perfect current matching characteristics can reduce the reference spurious. The improved and proposed whole new quadrature phase generator and a 2.4GHz integer-N frequency synthesizer including this two blocks is fabricated using a standard TSMC 0.25um CMOS process and has been measured completely. The measurement results of this chip exhibit the spurious tones of —65dBc @ fref below carry. But because the parasitic effect over expect, the image-rejection ratio is 10~12dB. This performance provides insufficient image rejection ratio in the most RF receiver architecture.
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