Title :
A fully integrated CMOS DCS-1800 frequency synthesizer
Author :
Craninckx, Jan ; Steyaert, Michel S J
Author_Institution :
Alcatel Microelectron., Zaventem, Belgium
fDate :
12/1/1998 12:00:00 AM
Abstract :
A prototype frequency synthesizer for the DCS-1800 system has been integrated in a standard 0.4 μm CMOS process without any external components. A completely monolithic design has been made feasible by using an optimized hollow-coil inductor low-phase-noise voltage-controlled oscillator (VCO). The frequency divider is an eight-modulus phase-switching prescaler that achieves the same speed as asynchronous dividers. The die area was minimized by using a dual-path active loop filter. An indirect linearization technique was implemented for the VCO gain. The resulting architecture is a fourth-order, type-2 charge-pump phase-locked loop. The measured settling time is 300 μs, and the phase noise is up to -123 dBc/Hz at 600 kHz and -138 dBc/Hz at 3 MHz offset
Keywords :
CMOS analogue integrated circuits; UHF integrated circuits; frequency synthesizers; linearisation techniques; mobile radio; phase locked loops; phase noise; transceivers; voltage-controlled oscillators; 0.4 micron; 1800 MHz; CMOS frequency synthesizer; DCS-1800 system; VCO gain; dual-path active loop filter; eight-modulus phase-switching prescaler; fourth-order type-2 charge-pump PLL; frequency divider; hollow-coil inductor; indirect linearization technique; low-phase-noise VCO; monolithic design; phase-locked loop architecture; voltage-controlled oscillator; Active filters; CMOS process; Charge pumps; Design optimization; Frequency conversion; Frequency synthesizers; Inductors; Linearization techniques; Prototypes; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
