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

Date Issued
26-10-2009
Author(s)
Darwhekar, Yogesh
Kumar, Rakesh
Sahu, Debapriya
Pavan, Shanthi
Lachhwani, Ashish
Krishnaswamy, T.
Mukherjee, Subhashish
DOI
Abstract
We describe the design of a fifth order opamp-RC filter in a 65nm digital CMOS process. Designed for a WLAN receiver chain, the baseband filter has a bandwidth of 9MHz 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 9.5mA from a 1.3V supply and occupies an area of 0.46mm 2. ©2009 IEEE.