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1-GHz and 2.8-GHz CMOS injection-locked ring oscillator prescalers

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3 Author(s)
Betancourt-Zamora, R.J. ; Allen Center for Integrated Syst., Stanford Univ., CA, USA ; Verma, S. ; Lee, T.H.

We implemented prescalers that can operate up to 2.8-GHz by exploiting the injection locking phenomena in differential CMOS ring oscillators. We tested a 5-stage, 1-GHz injection-locked modulo-8 prescaler fabricated in a 0.24-/spl mu/m CMOS technology that consumes 350 /spl mu/W of power and occupies 0.012 mm/sup 2/ of die area. The locking range is 20 MHz and the locked phase noise is -110 dBc/Hz @ 100 kHz. A 2.8-GHz, 3-stage, modulo-4 divider is also presented.

Published in:

VLSI Circuits, 2001. Digest of Technical Papers. 2001 Symposium on

Date of Conference:

14-16 June 2001