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High Gain and Balanced Output Balun–LNA Employing Positive Feedback Technique for Tuner of Digital Televisions | ||
| مجله مهندسی برق دانشگاه تبریز | ||
| مقاله 7، دوره 52، شماره 1 - شماره پیاپی 99، فروردین 1401، صفحه 61-66 اصل مقاله (654.5 K) | ||
| نوع مقاله: علمی-پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/tjee.2022.15355 | ||
| نویسندگان | ||
| N. Rahimzadeh1؛ P. Rezaei* 2 | ||
| 1Faculty of Electrical and Computer Engineering, Semnan University, .Semnan, Iran | ||
| 2Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran. | ||
| چکیده | ||
| 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. | ||
| کلیدواژه‌ها | ||
| Balun-LNA؛ High Gain؛ Noise Cancelling؛ Positive Feedback؛ Symmetrical Loads؛ Tuner of Digital Televisions | ||
| مراجع | ||
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