A 2.4-GHz monolithic fractional-N frequency synthesizer with robust phase-switching prescaler and loop capacitance multiplier
Authors:
- E. Sanchez-SinencioESE. Sanchez-Sinencio
- J. Silva-MartinezJSJ. Silva-Martinez
- S.H.K. EmbabiSES.H.K. Embabi
Top Cited Papers
- 5 June 2003
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 38 (6) , 866-874
Abstract
The design of a 2.4-GHz fully integrated ΣΔ fractional-N frequency synthesizer in a 0.35-μm CMOS process is presented. The design focuses on the prescaler and the loop filter, which are often the speed and the integration bottlenecks of the phase-locked loop (PLL), respectively. A 1.5-V 3-mW inherently glitch-free phase-switching prescaler is proposed. It is based on eight lower frequency 45°-spaced phases and a reversed phase-switching sequence. The large integrating capacitor in the loop filter was integrated on chip via a simple capacitance multiplier that saves silicon area, consumes only 0.2 mW, and introduces negligible noise. The synthesizer has a 9.4% frequency tuning range from 2.23 to 2.45 GHz. It dissipates 16 mW and takes an active area of 0.35 mm 2 excluding the 0.5-mm 2 digital ΣΔ modulator.Keywords
This publication has 17 references indexed in Scilit:
- A fully integrated CMOS frequency synthesizer with charge-averaging charge pump and dual-path loop filter for PCS- and cellular-CDMA wireless systemsIEEE Journal of Solid-State Circuits, 2002
- A 1.5-V 900-MHz monolithic CMOS fast-switching frequency synthesizer for wireless applicationsIEEE Journal of Solid-State Circuits, 2002
- A 5.3-GHz programmable divider for HiPerLAN in 0.25-/spl mu/m CMOSIEEE Journal of Solid-State Circuits, 2000
- A 60-dB dynamic-range CMOS sixth-order 2.4-Hz low-pass filter for medical applicationsIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 2000
- A 2-V, 1.8-GHz BJT phase-locked loopIEEE Journal of Solid-State Circuits, 1999
- A 1.6-GHz dual modulus prescaler using the extended true-single-phase-clock CMOS circuit technique (E-TSPC)IEEE Journal of Solid-State Circuits, 1999
- A fully integrated CMOS DCS-1800 frequency synthesizerIEEE Journal of Solid-State Circuits, 1998
- Cell-based fully integrated CMOS frequency synthesizersIEEE Journal of Solid-State Circuits, 1994
- Delta-sigma modulation in fractional-N frequency synthesisIEEE Journal of Solid-State Circuits, 1993
- A multiple modulator fractional dividerIEEE Transactions on Instrumentation and Measurement, 1991