High Gain and Balanced Output Balun–LNA Employing Positive Feedback Technique for Tuner of Digital Televisions

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Rahimzadeh Nima; Rezaei Pejman

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Journal Paper

Paper Information

Journal: TABRIZ JOURNAL OF ELECTRICAL ENGINEERING Year:2022 | Volume: | Issue: Page(s): 61-66

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Information Journal Paper

Title

High Gain and Balanced Output Balun–LNA Employing Positive Feedback Technique for Tuner of Digital Televisions

Author(s)

Rahimzadeh Nima | Rezaei Pejman | Issue Writer Certificate

Keywords

Balun-LNAQ4

High GainQ4

Noise CancellingQ4

Positive FeedbackQ4

Symmetrical LoadsQ4

Tuner of Digital TelevisionsQ4

Abstract

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.

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