Survey on Single Stage Amplifiers for Column Drivers in Active Matrix LCD Panels Leading to a Highly Linear Rail-to-Rail Robust Amplifier

Imtinan B Attili,Soliman A Mahmoud

doi:10.1109/access.2019.2954002

Abstract

This paper reviews single stage amplifiers identified in the literature as well as presents a new structure single stage highly linear rail-to-rail amplifier intended for column drivers in Active Matrix Liquid Crystal Display (AMLCD). The new proposed amplifier is based on applying current splitting technique on a rail-to-rail differential pair thus elevating the overall performance of the amplifier in terms of different performance parameters such as effective transconductance, output resistance, DC gain and unity gain frequency among others. One major advantage of the new proposed amplifier is its capability of providing a rail-to-rail stable operation without the need for compensation. The performance of the new proposed amplifier is tested on LTspice using 90nm CMOS technology under 1 Volts supply voltage and compared to other existing single stage amplifiers. Simulation results shows that the proposed amplifier provides a high DC gain, high effective transconductance and high output resistance while maintaining a stable operation with a phase margin of 80°. Obtained results also confirms that the amplifier exhibits rail-to-rail operation while maintaining a very low Total Harmonic Distortion (THD). The pulse response of the proposed amplifier indicates a fast response with a rise time and fall times almost twice as fast as the other examined topologies. Against Process, Voltage and Temperature (PVT) variations, the amplifier exhibits a robust performance as the DC gain variation range was within 20% only which is much less than the other examined topologies.

Highlights

Cathode Ray Tube (CRT) displays were dominating the market and providing an attractive performance in terms of quality, speed and resolution [1]
The paper examined four different single stage amplifier topologies that were identified in the literature along with a new proposed highly linear rail-to-rail nested current mirror amplifier
Simulations were carried using LTSPICE based on 90 nm CMOS model under both open and closed loop conditions

Summary

INTRODUCTION

Cathode Ray Tube (CRT) displays were dominating the market and providing an attractive performance in terms of quality, speed and resolution [1]. Mahmoud: Survey on Single Stage Amplifiers for Column Drivers in Active Matrix LCD Panels This eliminates the need to a backlight unit wither CCFL lamps of LEDs allowing the panel to be much thinner than LCD and LED displays [9]. This technology uses active matrix addressing technique with the incorporation of TFTs in each pixel while addressing each pixel through the use of a row and a column drivers [10]. All amplifier circuits were analyzed theoretically and tested through simulations which were carried on LTspice using 90 nm CMOS technology

EXSITING SINGLE STAGE AMPLIFIERS

CROSS EXAMINATION OF THE DIFFERENT SINGLE STAGE AMPLIFIER TOPOLOGIES

Findings

CONCLUSION