A fully integrated CMOS DCS-1800 frequency synthesizer

Author

Craninckx, Jan ; Steyaert, Michel S J

Author_Institution

Alcatel Microelectron., Zaventem, Belgium

Volume

33

Issue

12

fYear

1998

fDate

12/1/1998 12:00:00 AM

Firstpage

2054

Lastpage

2065

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;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.735547

Filename

735547