Title :
A 1.5-V 900-MHz monolithic CMOS fast-switching frequency synthesizer for wireless applications
Author :
Lo, Chi-Wa ; Luong, Howard Cam
Author_Institution :
Dept. of Electron. & Electr. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China
fDate :
4/1/2002 12:00:00 AM
Abstract :
A new architecture for phase-locked loop frequency synthesizers which employs a switchable-capacitor array to tune the output frequency and a dual-path loop filter operating in the capacitance domain is proposed. It provides many advantages, including simplified analog circuitry, low supply voltage, low power consumption, small chip area, fast frequency switching, and high immunity of substrate noise. Implemented in a standard 0.5-μm CMOS process, a fully integrated fractional-N synthesizer prototype with a third-order sigma-delta modulator is designed for 1.5 V and consumes 30 mW. The total chip area is, 0.9 × 1.1 mm2. The settling time is less than 100 μs and the phase noise is -118 dBc/Hz at 600-kHz offset
Keywords :
CMOS analogue integrated circuits; UHF integrated circuits; cellular radio; frequency synthesizers; high-speed integrated circuits; integrated circuit layout; integrated circuit noise; low-power electronics; phase locked loops; phase noise; sigma-delta modulation; switched capacitor networks; voltage-controlled oscillators; 0.5 micron; 1.5 V; 100 mus; 30 mW; 900 MHz; GSM receiver; VCO; capacitance domain; dual-path loop filter; fast frequency switching; fully integrated fractional-N synthesizer prototype; low power consumption; low supply voltage; monolithic CMOS fast-switching frequency synthesizer; output frequency tuning; phase noise; phase-locked loop frequency synthesizers; settling time; simplified analog circuitry; small chip area; substrate noise immunity; switchable-capacitor array; third-order sigma-delta modulator; total chip area; wireless applications; CMOS process; Capacitance; Energy consumption; Filters; Frequency synthesizers; Low voltage; Phase locked loops; Phased arrays; Power supplies; Switching circuits;
Journal_Title :
Solid-State Circuits, IEEE Journal of
