%0 Journal Article
%T High Gain and Balanced Output Balun–LNA Employing Positive Feedback Technique for Tuner of Digital Televisions
%J مجله مهندسی برق دانشگاه تبریز
%I رئیس دانشکده مهندسی برق و کامپیوتر
%Z 2008-7799
%A رحیم زاده, نیما
%A رضایی, پژمان
%D 2022
%\ 03/21/2022
%V 52
%N 1
%P 61-66
%! High Gain and Balanced Output Balun–LNA Employing Positive Feedback Technique for Tuner of Digital Televisions
%K Balun-LNA
%K High Gain
%K Noise Cancelling
%K Positive Feedback
%K Symmetrical Loads
%K Tuner of Digital Televisions
%R 10.22034/tjee.2022.15355
%X High gain Balun-low-noise-amplifier (LNA) is proposed for tuner of digital televisions (DTVs). The proposed Balun-LNA is based on CS-CG (common-source-common-gate) structure. To improve the isolasion and frequency response, Balun-LNA has cascode transistors before load resistors. Balun-LNA uses current-bleeding circuit to increasie transconductance of CS transistor, so that current-bleeding transistor has transconductance of N-1 times larger than transconductance of cascode transistor. Thereby, transconductance and current of CS transistor are increased N times, as N-1 times of current pass to current-bleeding transistor. Therefore current of CG and CS stages stay identical. Also, Balun-LNA employs a positive feedback to satisfy input impedance matching and CG transistor has higher transconductance. By increasing transconductance of CS and CG transistors, the proposed Balun-LNA achieves to high voltage gain. Accordingly, CG and CS tansistors have symmetrical currents and loads at the differential output of the proposed Balun-LNA. Symmetrical loads cause the balanced differential outputs. This proposed Balun-LNA is designed in 90-nm CMOS technology and covers the frequency range of 40 MHz to 1GHz. This Balun-LNA achieves the voltage gain of 22.6 dB, S11 of less than -10 dB and the Minimum NF of 5 dB. This Balun-LNA operates at the nominal supply voltage of 2.2v.
%U https://tjee.tabrizu.ac.ir/article_15355_f6c085e58e8926fa4bd25340bdddd1ab.pdf