Wideband Balun-LNA Employing gm-Boosting Feedback Technique and CBLD Circuit for Digital Televisions Tuner Application

Document Type : Research Paper

Authors

Department of Communications, Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran.

Abstract

A balun Low Noise Amplifier (Balun-LNA) with technique of gm-boosting feedback and a modified current bleeding (CBLD) circuit is proposed for application in the tuner of digital television (DTV) and other wideband radio and microwave receivers. Using the technique of gm-boosting feedback causes input impedance matching to not just depend on the CG transistor, and input impedance matching is satisfied by the transconductance of CG and CS transistors. Therefore, the transconductance of the CG transistor increases to boost the differential voltage gain of Balun-LNA and decrease its NF. Also, a modified current bleeding circuit is used in the CS stage in order to make the CS transistor have higher transconductance and its output current be identical to the output current of the CG stage. To compensate for having identical output currents, symmetrical loads are used in differential output so that they cause the gain and phase balance at the differential output. This Balun-LNA is built on 90-nm CMOS technology and operates in the digital television frequency band of 48 to 864 MHz. This Balun-LNA achieves a maximum differential voltage gain of 24 dB, an input return loss of less than -10 dB, and a minimum NF of 5 dB. This Balun-LNA works at 2.8 v nominal supply voltage and consumes the power of 2.5 mW.

Keywords

Main Subjects

References

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History

  • Receive Date: 06 April 2022
  • Revise Date: 12 June 2022
  • Accept Date: 12 September 2022

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