JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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A UHF CMOS Variable Gain LNA with Wideband Input Impedance Matching and GSM Interoperability

  • Woo, Doo Hyung (Dept. of Information, Communication & Electronics Engineering, The Catholic University of Korea) ;
  • Nam, Ilku (Dept. of Electrical Engineering, also with PNU-LG Smart Control Center, Pusan National University) ;
  • Lee, Ockgoo (Dept. of Electrical Engineering, also with PNU-LG Smart Control Center, Pusan National University) ;
  • Im, Donggu (Division of Electronics Engineering, Chonbuk National University)
  • Received : 2016.10.25
  • Accepted : 2017.06.29
  • Published : 2017.08.30
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Abstract

A UHF CMOS variable gain low-noise amplifier (LNA) is designed for mobile digital TV tuners. The proposed LNA adopts a feedback topology to cover a wide frequency range from 474 to 868 MHz, and it supports the notch filter function for the interoperability with the GSM terminal. In order to handle harmonic distortion by strong interferers, the gain of the proposed LNA is step-controlled while keeping almost the same input impedance. The proposed LNA is implemented in a $0.11{\mu}m$ CMOS process and consumes 6 mA at a 1.5 V supply voltage. In the measurement, it shows the power gain of greater than 16 dB, NF of less than 1.7 dB, and IIP3 of greater than -1.7 dBm for the UHF band.

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References

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