A digitally assisted baseband filter with 9MHz bandwidth and 0.3 dB IQ mismatch for a WLAN receiver chain

Author

Darwhekar, Yogesh ; Kumar, Rakesh ; Sahu, Debapriya ; Pavan, Shanthi ; Lachhwani, A. ; Krishnaswamy, T. ; Mukherjee, Subhashish

Author_Institution

Texas Instrum. India, IIT Madras, Madras, India

fYear

2009

fDate

24-27 May 2009

Firstpage

261

Lastpage

264

Abstract

We describe the design of a fifth order opamp-RC filter in a 65 nm digital CMOS process. Designed for a WLAN receiver chain, the baseband filter has a bandwidth of 9 MHz and features extensive use of digital hardware to correct for analog imperfections and thereby relaxing area and power requirements. Measurements show a 24 dB adjacent channel attenuation and an out-of-band IIP3 of 33 dBm. The complete filter consumes 9.5 mA from a 1.3 V supply and occupies an area of 0.46 mm².

Keywords

CMOS digital integrated circuits; HF amplifiers; RC circuits; integrated circuit design; low-power electronics; nanoelectronics; operational amplifiers; radio receivers; radiofrequency filters; radiofrequency integrated circuits; wireless LAN; IQ mismatch; WLAN receiver chain; adjacent channel attenuation; analog imperfection; bandwidth 9 MHz; current 9.5 mA; digital CMOS process; digitally assisted baseband filter; fifth order opamp-RC filter design; out-of-band IIP3; size 65 nm; voltage 1.3 V; Attenuation; Band pass filters; Bandwidth; Baseband; CMOS process; CMOS technology; Digital filters; Hardware; RAKE receivers; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on

Conference_Location

Taipei

Print_ISBN

978-1-4244-3827-3

Electronic_ISBN

978-1-4244-3828-0

Type

conf

DOI

10.1109/ISCAS.2009.5117735

Filename

5117735