Title :
Design of UWB LNA with interference rejection using coupled inductors
Author :
Abiri, E. ; Salehi, M.R. ; Rezaei, H.
Author_Institution :
Dept. of Electr. & Electron. Eng., Shiraz Univ. of Technol., Shiraz, Iran
Abstract :
In this circuit, a UWB LNA circuit with new input stage is proposed. In this scheme, a combination of coupled inductors and a new structure based on notch filter in input stage is utilized. As a result, the input stage is able to easily reject in-band and out-band interference with 43.2 dB and 25.1 dB respectively. This input stage is applied in an LNA. The simulations verify that the LNA has a peak gain of 25.9 dB in 3.1-4.8 GHz and a peak gain of 18.62 dB in 6.1-10.6 GHz frequency band while minimum NF in mentioned frequency bands are 1.33dB and 1.8 dB, respectively. This circuit rejects in-band and out-band interference 60.3 dB and 26.4 dB, while LNA core consumes 14.59 mW DC power from 1.8 V power supply. The input reflection coefficient (s11) is less than -8.8 dB over low and high frequency band since worst value of IIP3 over entire bandwidth is -23 dBm which occurs at 3.1 GHz.
Keywords :
inductors; low noise amplifiers; microwave amplifiers; notch filters; ultra wideband technology; LNA core; UWB LNA circuit design; coupled inductors; frequency 3.1 GHz to 4.8 GHz; frequency 6.1 GHz to 10.6 GHz; gain 18.62 dB; gain 25.9 dB; interference rejection; noise figure 1.33 dB; noise figure 1.8 dB; notch filter; out-band interference; power 14.59 mW; reflection coefficient; reject in-band interference; voltage 1.8 V; Bandwidth; CMOS integrated circuits; Gain; Interference; Noise; Noise measurement; Receivers; LNA; UWB; coupled inductors; image rejection; noise figure;
Conference_Titel :
Industrial Electronics and Applications (ISIEA), 2011 IEEE Symposium on
Conference_Location :
Langkawi
Print_ISBN :
978-1-4577-1418-4
DOI :
10.1109/ISIEA.2011.6108677
