Title :
An Image-Reject Low-Noise Amplifier with Passive Q-Enhanced Notch Filters
Author :
Anand, Pranavi ; Belostotski, Leonid ; Townsend, Kenneth ; Randall, Robert G. ; Haslett, James W.
Author_Institution :
Univ. of Calgary, Calgary
Abstract :
An image-reject low-noise amplifier with passive Q-enhanced notch filters in 0.18 mum CMOS is presented. Available IR-LNA designs employ a single notch filter to reject the precise image frequency and therefore require an additional automatic tuning circuit. This design achieves image-rejection over a bandwidth by using two series-connected passive notch filters, thereby relaxing the requirement of any additional tuning circuit. The proposed image-reject low noise amplifier has 16 dB gain at the signal frequency of 2.4 GHz and 58 dB rejection over a bandwidth of 100 MHz centered at the image frequency of 1.6 GHz. Noise Figure of 2.25 dB and P1dB of -13 dBm are obtained with bias current of 3.9 mA drawn from a 1.5 V power supply.
Keywords :
CMOS integrated circuits; integrated circuit design; low noise amplifiers; notch filters; passive filters; tuning; CMOS; IR-LNA design; current 3.9 mA; frequency 1.6 GHz; frequency 2.4 GHz; image frequency rejection; image-reject low-noise amplifier; passive Q-enhanced notch filters; size 0.18 mum; tuning circuit; voltage 1.5 V; Band pass filters; Bandwidth; Circuit noise; Circuit optimization; Frequency; Gain; Low-noise amplifiers; Noise figure; Passive filters; Power supplies;
Conference_Titel :
Electrical and Computer Engineering, 2007. CCECE 2007. Canadian Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
1-4244-1020-7
Electronic_ISBN :
0840-7789
DOI :
10.1109/CCECE.2007.98
