Title :
A 3–5GHz frequency tunable ultra wideband LNA for OFDM applications
Author :
Gong, Fei ; Lam, Kin Fung ; Ismail, Mohammed ; Park, Seok-Bae ; DeGroat, Joanne
Author_Institution :
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
In this paper, a frequency tunable differential input differential output low noise amplifier (LNA), used for 3-5 GHz OFDM applications, is proposed and analyzed. The LNA has a wideband input matching and a tunable output matching. The digital controlled capacitor arrays in the output matching networks allow the LNA to be switched smoothly in the frequency range of 3 to 5 GHz with output return loss less than -15 dB. The overall LNA is designed with TSMC 0.18 mum technology, and the simulation result shows that the input return loss is less than -12 dB and the noise figure is less than 4.5 dB in desired frequency range. At 3.3 V power supply, the LNA achieves an 8-12 dB transducer gain in the frequency range with the power consumption of only 20 mW.
Keywords :
OFDM modulation; circuit tuning; differential amplifiers; digital control; low noise amplifiers; microwave amplifiers; ultra wideband technology; wideband amplifiers; OFDM application; TSMC technology; digital controlled capacitor array; frequency 3 GHz to 5 GHz; gain 8 dB to 12 dB; input matching; low noise amplifier; orthogonal frequency division multiplexing; power 20 mW; size 0.18 mum; transducer gain; tunable output matching; ultra wideband LNA; voltage 3.3 V; Broadband amplifiers; Differential amplifiers; Digital control; Impedance matching; Low-noise amplifiers; Noise figure; OFDM; Power supplies; Switched capacitor networks; Ultra wideband technology;
Conference_Titel :
Circuits and Systems, 2009. MWSCAS '09. 52nd IEEE International Midwest Symposium on
Conference_Location :
Cancun
Print_ISBN :
978-1-4244-4479-3
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2009.5235974
