A Fast fc Automatic Tuning Circuit with Wide Tuning Range for WCDMA Direct Conversion Receiver Systems

Author

Watanabe, Osamu ; Ito, Rui ; Saigusa, Shigehito ; Arai, Tadashi ; Itakura, Tetsuro

Author_Institution

Corporate Res. & Dev. Center, Toshiba Corp., Kawasaki

fYear

2006

fDate

19-21 Sept. 2006

Firstpage

336

Lastpage

339

Abstract

A fast f_c automatic tuning circuit suitable for WCDMA systems is proposed. The circuit employs master-slave architecture using digitally controlled G_m-C filter for avoiding long transient response. The tuning feedback loop contains a 2-bit up-down counter ADC for fast tuning operation. Furthermore, to avoid degradation of f_c tuning accuracy due to reference feedthrough, an analog loop filter with notch located near reference frequency is used. The fast f _c automatic tuning circuit is fabricated in a SiGe BiCMOS process. The tuning time within 200mus is achieved for 35 chips from 2 lots and the standard deviation of 25.5 kHz is obtained for the average f_c of 2.12 MHz

Keywords

BiCMOS integrated circuits; Ge-Si alloys; analogue-digital conversion; circuit tuning; code division multiple access; filters; integrated circuit design; radio receivers; 2.12 MHz; 200 mus; 25.5 kHz; ADC; BiCMOS process; G_m-C filter; SiGe; WCDMA systems; analog loop filter; automatic tuning circuit; direct conversion receiver systems; f_c tuning; master-slave architecture; transient response; tuning feedback loop; Automatic control; Circuit optimization; Counting circuits; Digital control; Digital filters; Feedback loop; Master-slave; Multiaccess communication; Transient response; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2006. ESSCIRC 2006. Proceedings of the 32nd European

Conference_Location

Montreux

ISSN

1930-8833

Print_ISBN

1-4244-0303-0

Type

conf

DOI

10.1109/ESSCIR.2006.307599

Filename

4099772