Fully Integrated Tunable Q Enhanced Linear Low Noise Amplifier for Wireless Receivers

Electrical And Computer Engineering, Canadian University Dubai, Dubai, Uae ,Ziad El-Khatib,Sherif Moussa,Ahmed Al-Gindy,Department, Electrical And Computer Engineering, Canadian University Dubai, Dubai, Uae

doi:10.35940/ijeat.a1119.029320

Electrical And Computer Engineering, Canadian University Dubai, Dubai, Uae , Ziad El-Khatib + Show 3 more

Open Access

https://doi.org/10.35940/ijeat.a1119.029320

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Abstract

This paper presents the design of a fully-integrated tunable Q-enhanced LNA resonator filter designed to tune the circuit center frequency and quality factor Q. The proposed circuit achieves a 600 MHz 3dB bandwidth tunable center frequency at 2.4 GHz with a 5.5 dB Quality Factor Q tuning range. The proposed circuit utilize a distortion transistor compensator to improve linearity of the circuit. The results show an 18 dBc of third order intermodulation IM3 cancellation. The overall proposed circuit peak gain is 16.5 dB and the minimum NF is 0.94 dB at 2.4 GHz frequency with power consumption of 5.2 mA.

Highlights

In practical down conversion radio frequency receivers lossy bulky off-chip filters are used to provide filtering of unwanted out of band interference
The main idea of the proposed circuit is to compensate the loss of coupled-inductors by using active devices transistors to create negative resistance
A tunable Q-enhanced LNA resonator filter design circuit architecture is presented based on coupled resonator filter by means of mutual inductance coupled transformer

Summary

INTRODUCTION

In practical down conversion radio frequency receivers lossy bulky off-chip filters are used to provide filtering of unwanted out of band interference Such off-chip filters degrade the overall noise figure of the system. The main idea of the proposed circuit is to compensate the loss of coupled-inductors by using active devices transistors to create negative resistance. With this Q-enhanced resonator tuning circuit the resistance of the coupled-inductors is partially cancelled and the effective Q is increased. The proposed tunable Q-enhanced resonator filter designed to tune the quality factor Q and center frequency and is combined together with a distortion transistor compensator to improve linearity of the circuit. Other published tunable Q-enhanced LNA filter design [1] and [2] and [3] have a high noise figure of over 5

Q-ENHANCED COUPLED RESONANCE FILTER

PROPOSED Q-ENHANCED COUPLED-TRANSFORMER TUNING CIRCUIT

PROPOSED Q-ENHANCED LNA FILTER WITH DISTORTION TRANSISTOR COMPENSATOR

PROPOSED Q-ENHANCED LNA TRANSISTOR DIMENSIONS

RESULTS AND DISCUSSION

CONCLUSION