Low Voltage High Performance Super Class AB OTA design using SCCM and DTMOS with Enhanced Slew Rate and DC Gain

This paper presents a low-voltage differential operational transconductance amplifier (OTA) with enhanced DC gain and slew-rate. Based on the current mirror OTA topology, the optimization techniques are discussed in this work. The proposed structure achieves enhanced DC gain, unit gain frequency (UGF) and slew-rate (SR) with adding four devices. The design of the OTA is described with theory analysis. The OTA operates at the power supply of 1.8V. Simulation results for 0.18μm standard CMOS technology show that the DC gain increases from 60.6dB to 65dB, the UGF is optimized from 2.5MHz to 4.3MHz, the SR is enhanced from 0.88 V/μs to 4.8 V/μs with close power consumption dramatically.

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Low-Voltage Super class AB CMOS OTA cells with very high slew rate and power efficiency

IEEE Journal of Solid-State Circuits ◽

10.1109/jssc.2005.845977 ◽

2005 ◽

Vol 40 (5) ◽

pp. 1068-1077 ◽

Cited By ~ 161

Author(s):

A.J. Lopez-Martin ◽

S. Baswa ◽

Jaime Ramirez-Angulo ◽

R.G. Carvajal

Keyword(s):

Power Efficiency ◽

Low Voltage ◽

Slew Rate ◽

Class Ab ◽

Very High

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A novel family of low-voltage very low power super class AB OTAs with significantly enhanced slew rate and bandwidth

2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512) ◽

10.1109/iscas.2004.1328298 ◽

2004 ◽

Cited By ~ 1

Author(s):

Sushmita Baswa ◽

J. Ramirez-Angulo ◽

A.J. Lopez-Martin ◽

R.G. Carvajal

Keyword(s):

Low Power ◽

Low Voltage ◽

Slew Rate ◽

Class Ab

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Multi-Path Class AB Operational Amplifier with High Performance for SC Circuits

Journal of Circuits System and Computers ◽

10.1142/s0218126616501449 ◽

2016 ◽

Vol 25 (11) ◽

pp. 1650144 ◽

Cited By ~ 4

Author(s):

Meysam Akbari ◽

Omid Hashemipour

Keyword(s):

High Performance ◽

Cmos Technology ◽

Gain Bandwidth ◽

Class Ab ◽

Transconductance Amplifier ◽

Dc Gain ◽

Signal Path ◽

Folded Cascode ◽

Fast Settling ◽

Current Shunt

In this paper, a single-stage multi-path operational transconductance amplifier (OTA) with fast-settling response for high performance applications is designed. The produced amplifier uses current-shunt technique, double recycling structure, cross-coupled positive feedback configuration and all idle devices in the signal path to enhance transconductance of the conventional folded cascode (FC) amplifier. These transconductance boosting techniques lead to higher DC gain, gain bandwidth (GBW), slew rate and lower settling time compared to the previous FC structures while phase margin is degraded. Simulation results are presented using 90 nm CMOS technology which show 1,800% increment in GBW and a 33.2 dB DC gain improvement in the approximately same power consumption compared to the conventional FC amplifier.

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