Title :
600 MHz digitally controlled BiCMOS oscillator (DCO) for VLSI signal processing and communication applications
Author :
Yusof, Azman M. ; Aun, Lim Chu ; Hasan, S. M Rezaul
Author_Institution :
Sch. of Electr. & Electron. Eng., Sains Malaysia Univ., Perak, Malaysia
Abstract :
A 16-bit digitally controlled BiCMOS ring oscillator (DCO) is described. This BiCMOS DCO design provides improved frequency stability under thermal fluctuations. Simulations of a 5-stage DCO using 1 μm BiCMOS process parameters achieved controllable frequency range of 90-640 MHz with a linear/quasi-linear range of around 300 MHz. Monotone frequency gain (frequency vs control-word transfer function) with fine stepping (tuning) in several KHz was verified This augurs the prospect of accurate frequency lock in a BiCMOS all digital PLL (ADPLL) application in digital VLSI communication systems. Worstcase jitter due to digital control transitions at pathological control-word boundaries for the BiCMOS DCO was observed to be less than 50 ps, which is lower than that for the CMOS DCO
Keywords :
BiCMOS integrated circuits; VLSI; circuit stability; digital phase locked loops; frequency stability; jitter; voltage-controlled oscillators; 1 micron; 6 bit; 90 to 640 MHz; VLSI signal processing; all digital PLL; communication applications; control-word transfer function; controllable frequency range; digital control transitions; digitally controlled BiCMOS oscillator; frequency lock; frequency stability; linear/quasi-linear range; monotone frequency gain; pathological control-word boundaries; ring oscillator; thermal fluctuations; worstcase jitter; BiCMOS integrated circuits; Communication system control; Control systems; Digital control; Fluctuations; Frequency; Process control; Ring oscillators; Thermal stability; Very large scale integration;
Conference_Titel :
VLSI, 1998. Proceedings of the 8th Great Lakes Symposium on
Conference_Location :
Lafayette, LA
Print_ISBN :
0-8186-8409-7
DOI :
10.1109/GLSV.1998.665202
