A High Gain Low Noise Figure Double Balanced Down Conversion Mixer for Band 1 of WiMedia System

Abhay Chaturvedi,Mithilesh Kumar,R.S Meena

doi:10.17485/ijst/2019/v12i12/142360

Abhay Chaturvedi, Mithilesh Kumar + Show 1 more

Open Access

https://doi.org/10.17485/ijst/2019/v12i12/142360

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Abstract

Objective: To propose an improved double balanced down conversion mixer for band 1 of WiMedia system at RF frequency of 3.432 GHz and IF frequency of 264 MHz. Method/Analysis: The proposed mixer is based on the Gilbert cell architecture. It uses switch bias technique to improve the noise figure and resistive current injection technique to improve the conversion gain and linearity. A resonating inductor is used to cancel out the effects of parasitic capacitances. Moreover, T type impedance matching, LC impedance matching and output buffer are used at RF trans conductance stage, LO switching stage and load stage respectively for matching purpose. Mixer is simulated in 0.18 μm CMOS technology using keysight Advanced Design System (ADS) software. Findings: Simulation results show that mixer achieves maximum conversion gain of 8.057 dB, third order Input Intercept Point (IIP3) of -10.88 dBm, Double Sideband (DSB) noise figure of 3.515 dB and S11 of -22.926 dB at 1.8 V dc supply voltage. Novelty/Improvement: A high gain, low noise figure double balanced down conversion mixer with low value of input reflection coefficient and suitable linearity is proposed for band 1 of Wimedia system. Keywords: Current Injection Technique, Double Balanced, Down Conversion Mixer, L and T Type Matching Networks, Switch Bias Technique, Wimedia System

Highlights

WiMedia system provides an ISO-published radio standard for high-speed, ultra-wideband wireless personal area network
This paper presents the design of down-conversion mixer for band 1 of WiMedia system
Typical overall gain of front end RF filters and Low noise Amplifier (LNA) placed prior to mixer in receiver, is assumed as 8 dB18 so operating RF input power level for mixer simulation is chosen as − 55.5 dBm ( − 63.5 dBm + 8 dBm), accommodating overall gain of front end filters and LNA

Summary

Introduction

WiMedia system provides an ISO-published radio standard for high-speed, ultra-wideband wireless personal area network. This technology is accepted by industries for wireless USB and high-speed bluetooth applications[1]. This standard uses 3.1–10.6 GHz unlicensed frequency spectrum. Schematic of double balanced Gilbert cell mixer is shown, in which transistors M1 and M2 work as a transconductance stage which convert differ-. A High Gain Low Noise Figure Double Balanced Down Conversion Mixer for Band 1 of WiMedia System. Transistors M3–M6 work as a differential switch controlled by differential LO signal.

Proposed Work

Simulation Results

Conclusion