A Variable Gain CMOS RF front-end for 5 GHz Applications

Author

Ong, Henry Kok Fong ; Choi, Yeung Bun ; Yeoh, Wooi Gan

Author_Institution

Inst. of Microelectron., Singapore

fYear

2007

fDate

9-11 Dec. 2007

Firstpage

314

Lastpage

317

Abstract

A 2.5-V, 31.5-mW, 5-GHz fully-differential RF front-end on 0.13-mum CMOS technology for 5-GHz application is presented. The RF front-end comprises of 3-bit digitally controlled variable gain low-noise amplifier (VGLNA) and 40-MHz IF down conversion mixer with a single stage IF amplifier. An inductor source degeneration LNA using current steering cascode stages is used to implement the variable gain control. A Gilbert mixer with current injection is used to reduce conversion loss and lower LO swing requirement. A single stage IF amplifier is implemented to increase the gain and output matching for 4-KOhms (differential). Measurements showed a >20-dB voltage conversion gain, 13-dB Noise figure, -6.5-dBm IIP3 and better than 20-dB input match for the RF front-end.

Keywords

CMOS integrated circuits; low noise amplifiers; microwave amplifiers; microwave mixers; CMOS technology; Gilbert mixer; IF down conversion mixer; conversion loss; current injection; current steering cascode stages; digitally controlled variable gain low-noise amplifier; frequency 40 MHz; frequency 5 GHz; fully-differential RF front-end; inductor source degeneration LNA; noise figure 13 dB; power 31.5 mW; resistance 4 kohm; single stage IF amplifier; size 0.13 mum; variable gain CMOS RF front-end; variable gain control; voltage 2.5 V; word length 3 bit; CMOS technology; Differential amplifiers; Digital control; Gain control; Gain measurement; Impedance matching; Inductors; Low-noise amplifiers; Radio frequency; Radiofrequency amplifiers; 5 GHz RF front-end; Mixer; VGLNA; current-steering; down-conversion; receiver;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio-Frequency Integration Technology, 2007. RFIT 007. IEEE International Workshop on

Conference_Location

Rasa Sentosa Resort

Print_ISBN

978-1-4244-1307-2

Electronic_ISBN

978-1-4244-1308-9

Type

conf

DOI

10.1109/RFIT.2007.4443979

Filename

4443979