Low Noise Figure and High Conversion Gain CMOS LNA-Mixer for WLAN Applications

Document Type : Original Article

Authors

1 Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran.

2 Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran,

Abstract

This paper presents a merged low noise amplifier (LNA) and mixer for wireless local area networks (WLANs) applications. The proposed down-conversion LNA-mixer is designed for 2-3 GHz radio frequency (RF) band and an intermediate frequency (IF) of 100 MHz using RF-TSMC CMOS 0.18 μm technology. A new input matching network is introduced for common source LNA to provide good input matching. In addition, the conversion gain (CG) and noise performance of the LNA-mixer are improved by employing an active load and current bleeding technique in the mixer. The proposed LNA-Mixer has been simulated by Advanced Design System (ADS). Simulation results show the high conversion gain of 15–17 dB and low double side-band noise figure (DSB-NF) of 4±0.5 dB as well as high isolation between ports at frequency band of 2-3 GHz. Monte Carlo simulations has been done for the proposed LNA-mixer with 100 samples to verify the impact of process variations and mismatch. For the conversion gain and for DSB-NF, simulation results show respectively a mean (μ) of 15.7 dB with standard deviation (σ) of 0.11 dB, and μ=7.4 dB with σ=0.37 dB and confirm their low sensitivity to process variations. The proposed LNA-Mixer operates at the supply voltage of 1.5 V with power consumption of 19.8 mW.

Keywords

References

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Applied Electromagnetics
Volume 6, Issue 2 - Serial Number 17
September 2018
Pages 19-31

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History

  • Receive Date: 26 September 2018
  • Revise Date: 24 March 2019
  • Accept Date: 18 June 2019
  • Publish Date: 30 September 2019

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