Title :
A 10-GHz CMOS quadrature LC-VCO for multirate optical applications
Author :
Li, Shenggao ; Kipnis, Issy ; Ismail, Mohammed
Author_Institution :
Intel Corp., Fremont, CA, USA
Abstract :
A 10-GHz quadrature LC-VCO (QVCO) fabricated in a 0.13-μm CMOS process for 10-Gb/s multirate optical applications is described. Bimodal oscillation behavior (or phase ambiguity) inherent to quadrature LC-VCOs is analyzed theoretically and a cascode-based coupling method is proposed which effectively eliminates bimodal oscillation. Digitally controlled capacitor arrays are used in this design to extend the tuning range of the QVCO to cover multirate operations. The QVCO achieves a jitter generation of only 32 mUIpp at 10 GHz and a phase noise of -95 dBc/Hz at 1-MHz frequency offset with only 8 mA of current consumption in the QVCO core.
Keywords :
CMOS analogue integrated circuits; optical communication equipment; voltage-controlled oscillators; 0.13 micron; 10 GHz; 10 Gbit/s; 8 mA; CMOS quadrature LC-VCO; bimodal oscillation; cascode coupling; digitally controlled capacitor array; jitter generation; multirate optical communication; phase ambiguity; phase noise; tuning range; Clocks; High speed optical techniques; Jitter; Optical feedback; Optical filters; Optical receivers; Optical transmitters; Phase noise; Transceivers; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2003.817258
