A 1.2-V CMOS front-end for LTE direct conversion SAW-less receiver

Author

Riyan, Wang ; Zhengping, Li ; Jiwei, Huang ; Min, Fang ; Weifeng, Zhang ; Longyue, Zeng

Author_Institution

Guangzhou Runxin Inf. Technol. Co., Ltd., Guangzhou, China

fYear

2011

fDate

Nov. 30 2011-Dec. 2 2011

Firstpage

85

Lastpage

88

Abstract

A CMOS RF front-end for the Long-Term Evolution (LTE) direct conversion receiver is presented in this paper. With low noise transconductance amplifier (TCA), current commutating passive mixer and transimpedance operational amplifier (TIA), the RF front-end structure enables high-integration, high linearity and simple frequency planning for LTE multi-band applications. Large variable gain is achieved using current-steering transconductance stages. A current commutating passive mixer with 25% duty-cycle LO improves gain, noise and linearity. Direct coupled current-input filter (DCF) is employed to suppress the out-of-band interferer. Fabricated in a 0.13-μm CMOS process, the RF front-end achieves 45dB conversion voltage gain, 2.7dB N F, -7dBm IIP3, and +60dBm IIP2 with calibration from 2.3GHz to 2.7GHz. The total RF front end with divider draws 40mA from a single 1.2-V supply.

Keywords

CMOS integrated circuits; Long Term Evolution; analogue-digital conversion; frequency dividers; interference suppression; mixers (circuits); operational amplifiers; radio receivers; surface acoustic wave filters; CMOS RF front end; LTE; SAW less receiver; current 40 mA; current commutating passive mixer; current steering transconductance; direct conversion receiver; direct coupled current input filter; divider; frequency 2.3 GHz to 2.7 GHz; long term evolution; out-of-band interference suppression; size 0.13 mum; transconductance amplifier; transimpedance operational amplifier; voltage 1.2 V; CMOS integrated circuits; Gain; Gain control; Mixers; Noise; Radio frequency; Receivers; 25% duty-cycle; IIP2; IIP3; LTE; RF CMOS; direct conversion receiver; filter; front-end; noise figure; passive mixer; quadrature demodulator; variable gain;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on

Conference_Location

Beijing

Print_ISBN

978-1-4577-0517-5

Type

conf

DOI

10.1109/RFIT.2011.6141782

Filename

6141782