Title :
Design of a Low Noise Amplifier with integrated notch filter for interference rejection in ultra-wideband systems
Author :
Koirala, Nischal ; Pokharel, R.K. ; Galal, A.I.A. ; Kanaya, H. ; Yoshida, K.
Author_Institution :
Grad. Sch. of Inf. Sci. & Electr. Eng., Kyushu Univ., Fukuoka, Japan
Abstract :
A fully integrated 0.18um CMOS Low Noise Amplifier (LNA) with Notch Filter for interference rejection at 5-6 GHz in UWB systems is presented. The notch filter comprises a series LC resonance circuit, which with a resistance cancelation approach yields excellent attenuating characteristics. The post layout simulation of this circuit is able to achieve more than 25 dB of attenuation at 5.6 GHz. The LNA is composed of two stages-cascode and cascade stage, in addition to inter-stage LC components to achieve wider gain. The shunt resistive feedback is employed to obtain a good input matching and low noise figure. The proposed UWB LNA achieves a simulated (post layout) gain of 18 dB and has the input and output matching less than -7dB and -10dB respectively over the entire range. The NF in the region of interest is less than 5.1 dB.
Keywords :
CMOS analogue integrated circuits; interference suppression; low noise amplifiers; microwave amplifiers; microwave filters; notch filters; ultra wideband technology; CMOS low noise amplifier; LC resonance circuit; frequency 5 GHz to 6 GHz; gain 18 dB; integrated notch filter; interference rejection; shunt resistive feedback; size 0.18 mum; ultrawideband systems; Attenuation; CMOS integrated circuits; Gain; Impedance matching; Interference; Resistance; Resonator filters; Cross-coupled MOS transistors; Flat Gain; Interference Rejection; LNA; Negative Resistance; Notch Filter; Quality Factor improvement; UWB System; Wideband matching;
Conference_Titel :
Microwave Conference Proceedings (CJMW), 2011 China-Japan Joint
Conference_Location :
Hangzhou
Print_ISBN :
978-1-4577-0625-7
Electronic_ISBN :
978-7-308-08555-7
