An RF receiver with an integrated adaptive notch filter for multi-standard applications

Author

Borna, Amir ; Hull, Christopher ; Yanjie Wang ; Hua Wang ; Niknejad, A.

Author_Institution

Berkeley Wireless Res. Center, Univ. of California at Berkeley, Berkeley, CA, USA

fYear

2013

fDate

16-20 Sept. 2013

Firstpage

185

Lastpage

188

Abstract

This paper presents a 2.4GHz current-mode RF direct-conversion receiver implemented in a 90nm CMOS process with a novel adaptive notch filter. The notch filter uses the blocker frequency to up-convert a DC null to the pass-band, attenuating the blocker before entering the receiver. A synthesized inductor on the order of μH realizes the DC null. Blocker attenuation as large as 20dB is observed at a 40MHz offset frequency while the in-band attenuation increases by only 2dB. This proves that this technique is effective in attenuating blockers in broadband multi-standard radios without using any high-Q mechanical filters at their front-ends.

Keywords

CMOS integrated circuits; UHF integrated circuits; adaptive filters; current-mode circuits; interference suppression; notch filters; radio receivers; time-varying filters; CMOS process; UHF integrated circuits; blocker attenuation; current-mode RF direct-conversion receiver; frequency 2.4 GHz; high-Q mechanical filters; integrated adaptive notch filter; size 90 nm; synthesized inductor; Attenuation; Band-pass filters; CMOS integrated circuits; Impedance; Inductors; Radio frequency; Receivers; Active inductors; SAW filters; current mode circuits; interference suppression; time varying circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2013 Proceedings of the

Conference_Location

Bucharest

ISSN

1930-8833

Print_ISBN

978-1-4799-0643-7

Type

conf

DOI

10.1109/ESSCIRC.2013.6649103

Filename

6649103