Title :
A new CMOS wideband RF front-end for multistandard low-IF wireless receivers
Author :
Reja, Md Mahbub ; Allam, Ahmed ; Filanovsky, I.M.
Author_Institution :
Alberta Univ., Edmonton, Alta., Canada
Abstract :
A wideband radio-frequency (RF) receiver front-end is designed in 0.18 μm CMOS technology with a new linearization technique that makes the circuit suitable for operating at low supply voltage. The proposed front-end circuit includes an input low noise wideband amplifying stage (LNA) of new configuration with output linearized transconductance stage, and a switching stage. Dual-loop resistive feedback applied around the LNA allows one to achieve input wideband matching. Linearity is enhanced by attenuating the effective transconductance of the transconductance stage. With an RF input signal of 1.9 GHz, the proposed front-end circuit exhibits 15.5 dB conversion gain, 7.2 dB SSB noise figure, -11.2 dBm 1-dB compression point, and -1.5 dBm third-order input intercept-point (IIP3) in simulations. The input wideband matching to 50 Ω is achieved with -3 dB bandwidth of around 3 GHz. The input return loss (S11) varies from -26 dB to -10.5 dB in the frequency range of DC to 3.5 GHz. The proposed front-end consumes 22.3 mA DC current from 1.8 V supply voltage and occupies an area of 0.9×0.85 mm2.
Keywords :
CMOS analogue integrated circuits; feedback amplifiers; impedance matching; integrated circuit design; linearisation techniques; low-power electronics; microwave integrated circuits; nonlinear network analysis; radio receivers; wideband amplifiers; 0 to 3.5 GHz; 0.18 micron; 0.85 mm; 0.9 mm; 1.8 V; 15.5 dB; 22.3 mA; 26 to 10.5 dB; 7.2 dB; CMOS wideband RF front-end; SSB noise figure; compression point; conversion gain; design approach; dual-loop resistive feedback; effective transconductance attenuation; linearity; linearization; low noise wideband amplifying stage; low voltage circuit; multistandard low-IF wireless receivers; output linearized transconductance stage; power consumption; return loss; switching stage; third-order input intercept-point; wideband matching; wideband radiofrequency receiver front-end; CMOS technology; Circuit noise; Feedback; Impedance matching; Linearization techniques; Low voltage; Radio frequency; Switching circuits; Transconductance; Wideband; Front end; dual-loop feedback; linearized low-noise amplifier; low-IF receiver; matched input;
Conference_Titel :
Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on
Print_ISBN :
0-7803-8834-8
DOI :
10.1109/ISCAS.2005.1465038
