A Quadrature Charge-Domain Filter With Frequency Downconversion for RF Receivers

Author

Huang, Ming-Feng ; Chiu, Tzu-Lun

Author_Institution

Inf. & Commun. Res. Labs., Ind. Technol. Res. Inst., Hsinchu, Taiwan

Volume

58

Issue

5

fYear

2010

fDate

5/1/2010 12:00:00 AM

Firstpage

1323

Lastpage

1332

Abstract

A quadrature charge-domain filter (QCDF) is proposed for downconversion and filters in RF receivers. The QCDF is designed with a chosen IF of 268 MHz, which is assumed a downconverted signal from 802.11 g RF signals by a subsampling or subharmonic mixer. Through a sampling rate of 1072 MS/s, the QCDF possessed 53-dB stopband attenuation, 32.51-dB alias-band attenuation, and 44-MHz bandwidth. For quadrature performance, this QCDF provided -27.67-dB error vector magnitude, using a 64 quadratic amplitude modulation signal with a bit rate of 54 Mb/s. This chip totally consumed 7.7 mA from a 1.2-V power supply and occupied 0.08 mm² in 90-nm CMOS logical process.

Keywords

digital filters; quadrature amplitude modulation; radio receivers; QCDF; RF receiver; alias-band rejection; bandwidth 44 MHz; current 7.7 mA; error vector magnitude; frequency 268 MHz; frequency downconversion; quadratic amplitude modulation signal; quadrature charge-domain filter; size 90 nm; stopband attenuation; voltage 1.2 V; Alias-band rejection (ABR); alias-frequency response (AFR); antialias filter (AAF); charge-domain filter (CDF); fundamental-frequency response (FFR); quadrature CDF (QCDF); stopband attenuation (SBA);

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2010.2042849

Filename

5439910