半导体学报
半導體學報
반도체학보
CHINESE JOURNAL OF SEMICONDUCTORS
2008年
5期
930-935
,共6页
相位插值器%时钟数据恢复%CMOS
相位插值器%時鐘數據恢複%CMOS
상위삽치기%시종수거회복%CMOS
phase interpolator%clock and data recovery%CMOS
分析了应用于时钟恢复电路中的相位插值器.为相位插值器建立了数学模型并基于模型对相位插值器在数学域进行了详细的分析.分析结果表明相位插值器输出时钟的相位和幅度强烈地依赖于插值器输入时钟间的相位差,同时提出一种新的编码方法来补偿相位的非线性.考虑到实际电路中寄生效应,文章同样在电路域中对相位插值器进行了详细分析.通过建立电路模型得到RC时间常数和输入时钟间的相差的关系,得到了它对相位插值器线性的影响.在设计中通过在PI的输入增加可控RC的输入缓冲器来调整输入时钟沿的快慢,从而降低了这种影响.最后利用分析得到的结论,使用90nm CMOS工艺设计并制造了一个相位插值器.它的供电电压为1.2V,功耗为1mw,工作范围从1GHz到5GHz.测试结果表明,输出相位单调并具有良好的线性度,验证了分析的正确性.
分析瞭應用于時鐘恢複電路中的相位插值器.為相位插值器建立瞭數學模型併基于模型對相位插值器在數學域進行瞭詳細的分析.分析結果錶明相位插值器輸齣時鐘的相位和幅度彊烈地依賴于插值器輸入時鐘間的相位差,同時提齣一種新的編碼方法來補償相位的非線性.攷慮到實際電路中寄生效應,文章同樣在電路域中對相位插值器進行瞭詳細分析.通過建立電路模型得到RC時間常數和輸入時鐘間的相差的關繫,得到瞭它對相位插值器線性的影響.在設計中通過在PI的輸入增加可控RC的輸入緩遲器來調整輸入時鐘沿的快慢,從而降低瞭這種影響.最後利用分析得到的結論,使用90nm CMOS工藝設計併製造瞭一箇相位插值器.它的供電電壓為1.2V,功耗為1mw,工作範圍從1GHz到5GHz.測試結果錶明,輸齣相位單調併具有良好的線性度,驗證瞭分析的正確性.
분석료응용우시종회복전로중적상위삽치기.위상위삽치기건립료수학모형병기우모형대상위삽치기재수학역진행료상세적분석.분석결과표명상위삽치기수출시종적상위화폭도강렬지의뢰우삽치기수입시종간적상위차,동시제출일충신적편마방법래보상상위적비선성.고필도실제전로중기생효응,문장동양재전로역중대상위삽치기진행료상세분석.통과건립전로모형득도RC시간상수화수입시종간적상차적관계,득도료타대상위삽치기선성적영향.재설계중통과재PI적수입증가가공RC적수입완충기래조정수입시종연적쾌만,종이강저료저충영향.최후이용분석득도적결론,사용90nm CMOS공예설계병제조료일개상위삽치기.타적공전전압위1.2V,공모위1mw,공작범위종1GHz도5GHz.측시결과표명,수출상위단조병구유량호적선성도,험증료분석적정학성.
In this paper, a detailed analysis of a phase interpolator for clock recovery is presented. A mathematical model issetup for the phase interpolator and we perform a precise analysis using this model. The result shows that the output ampli-tude and linearity of phase interpolator is primarily related to the difference between the two input phases. A new enco-ding pattern is given to solve this problem. Analysis in the circuit domain was also undertaken. The simulation results showthat the relation between RC time-constant and time difference of input clocks affects the linearity of the phase interpola-tor. To alleviate this undesired effect,two adjustable-RC buffers are added at the input of the PI. Finally,a 90nm CMOSphase interpolator,which can work in the frequency from 1GHz to 5GHz,is proposed. The power dissipation of the phaseinterpolator is 1roW with a 1.2V power supply. Experiment results show that the phase interpolator has a monotone outputphase and good linearity.
