Title :
A Wide Input-Range ΣΔ Modulator for Applications to Spread-Spectrum Clock Generator
Author :
Kao, Yao-Huang ; Hsieh, Yi-Bin
Author_Institution :
Inst. of Commun. Eng., Nat. Chiao-Tung Univ., Hsin-Chu
Abstract :
A spread-spectrum clock generator (SSCG) using fractional-N phase-locked loop (PLL) with an extended range sigma-delta (ΣΔ) modulator is presented in this paper. The proposed ΣΔ modulator simply adds an extra output bit in the first stage modulator. It can enlarge the input range about three times as compared to the conventional modulator and solve the saturation problem when the input exceeds the boundary of the conventional modulator. The proposed SSCG has been fabricated in TSMC 0.35-mum double-poly quadruple-metal CMOS process with output frequency of 300MHz. The active area is 0.63×0.62 mm2 and the power consumption is 17.5mW
Keywords :
clocks; phase locked loops; pulse generators; sigma-delta modulation; 0.35 micron; 17.5 mW; 300 MHz; CMOS process; PLL; SSCG; TSMC; double poly quadruple metal; phase locked loop; sigma delta modulator; spread spectrum clock generator; Circuits; Clocks; Delta-sigma modulation; Digital control; Digital modulation; IEEE members; Phase frequency detector; Phase locked loops; Spread spectrum communication; Voltage-controlled oscillators; PLL; sigma-delta modulator; spread spectrum;
Conference_Titel :
Circuits and Systems, 2006. APCCAS 2006. IEEE Asia Pacific Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0387-1
DOI :
10.1109/APCCAS.2006.342525
