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Blocker filtering low-noise amplifier for SAW-less Bluetooth receiver system

Published online by Cambridge University Press:  07 January 2010

Heesong Seo ,
Hyejeong Song ,
Changjoon Park ,
Jehyung Yoon ,
Inyoung Choi  and
Bumman Kim
Heesong Seo
Affiliation:
Department of Electrical Engineering, POSTECH (Pohang University of Science and Technology), Gyeongbuk 790-784, Republic of Korea.
Hyejeong Song
Affiliation:
Department of Electrical Engineering, POSTECH (Pohang University of Science and Technology), Gyeongbuk 790-784, Republic of Korea.
Changjoon Park
Affiliation:
Department of Electrical Engineering, POSTECH (Pohang University of Science and Technology), Gyeongbuk 790-784, Republic of Korea.
Jehyung Yoon
Affiliation:
Department of Electrical Engineering, POSTECH (Pohang University of Science and Technology), Gyeongbuk 790-784, Republic of Korea.
Inyoung Choi
Affiliation:
Department of Electrical Engineering, POSTECH (Pohang University of Science and Technology), Gyeongbuk 790-784, Republic of Korea.
Bumman Kim*
Affiliation:
Department of Electrical Engineering, POSTECH (Pohang University of Science and Technology), Gyeongbuk 790-784, Republic of Korea.
*
Corresponding author: B. Kim Email: bmkim@postech.ac.kr
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Abstract

A 2.4 GHz CMOS blocker filtering low-noise amplifier (BF-LNA) suitable for Bluetooth™ application is presented. The circuit employs a differential amplifier topology with a current mirror active load and a notch filter. Each path amplifies differentially with the common mode input signal, but there is a notch filter rejecting only the wanted signal at one path. By subtracting the two signals from each path, the large interferers are rejected and only the wanted signal is amplified. Therefore, it becomes a narrow-band amplifier with blocker filtering capability, realizing a receiver system without need of the off-chip SAW filter. The BF-LNA is designed using a 0.13-μm CMOS process. The measured performances are a gain of 11.4 dB, and a noise figure of 1.85 dB. Attenuation levels at 400 MHz apart from the target frequency are −13 and −29 dBc at each sideband. The P1dB,in and IIP3 are −8.2 and 1.46 dBm, respectively. The proposed BF-LNA can reject large interferers at the front-end of the receiver system with a good noise figure.

Keywords

Locker filteringBluetoothLNASAW-less
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 1 , Issue 5 , October 2009 , pp. 447 - 452
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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References

REFERENCES

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