600 MHz digitally controlled BiCMOS oscillator (DCO) for VLSI signal processing and communication applications

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 /spl mu/m BiCMOS process parameters achieved controllable frequency range of 90-640 MHz with a linear...

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Bibliographic Details
Published inProceedings of the 8th Great Lakes Symposium on VLSI (Cat. No.98TB100222) pp. 71 - 76
Main Authors Yusof, A.M., Lim Chu Aun, Hasan, S.M.R.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1998
Subjects
BiCMOS integrated circuits
Communication system control
Control systems
Digital control
Fluctuations
Frequency
Process control
Ring oscillators
Thermal stability
Very large scale integration
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Summary: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 /spl mu/m 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.
ISBN:0818684097
9780818684098
ISSN:1066-1395
DOI:10.1109/GLSV.1998.665202