High-gain and high-bandwidth rail-to-rail operational amplifier with slew rate boost circuit

A low voltage low power two-stage CMOS amplifier with high open-loop gain, high gain bandwidth product (GBW) and enhanced slew rate is presented in this work. The proposed circuit makes use of folded cascode gm-boosting cells in conjunction with a low voltage gain enhanced cascode mirror using quasi-floating gate (QFGMOS) transistors. QFGMOS transistors are also used in input pair and adaptive biasing, which facilitate large dynamic output current in the presented circuit. Consequently, the slew rate is enhanced without much increase in static power dissipation. The unity gain frequency (UGF) and dc gain of the circuit are 29.4[Formula: see text]MHz and 132[Formula: see text]dB, respectively. The amplifier is operated at 0.6[Formula: see text]V dual supply with 89[Formula: see text][Formula: see text]W power consumption and has a nearly symmetrical average slew rate of 51.5[Formula: see text]V/[Formula: see text]s. All simulations including Monte Carlo and corner analysis are carried out using 180-nm CMOS technology for validating the design with help of spice tools.

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Design of a high gain rail-to-rail operational amplifier

Information Science and Electronic Engineering ◽

10.1201/9781315265278-64 ◽

2016 ◽

pp. 275-278

Keyword(s):

Operational Amplifier ◽

High Gain ◽

Rail To Rail

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Constant-g/sub m/ constant-slew-rate high-bandwidth low-voltage rail-to-rail CMOS input stage for VLSI cell libraries

Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03. ◽

10.1109/iscas.2003.1205526 ◽

2003 ◽

Author(s):

J.M. Carrillo ◽

J.F. Duque-Carrillo ◽

G. Torelli ◽

J.L. Ausin

Keyword(s):

Low Voltage ◽

Slew Rate ◽

Input Stage ◽

Rail To Rail ◽

High Bandwidth

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Design of a Rail-to-Rail Operational Amplifier with Low Supply Voltage and Low Power Dissipation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.380-384.3275 ◽

2013 ◽

Vol 380-384 ◽

pp. 3275-3278

Author(s):

Zhan Peng Jiang ◽

Rui Xu ◽

Hai Huang ◽

Chang Chun Dong

Keyword(s):

Power Dissipation ◽

Operational Amplifier ◽

Supply Voltage ◽

High Gain ◽

Op Amp ◽

Rail To Rail ◽

Dc Gain ◽

Low Power Dissipation ◽

Static Power ◽

Low Supply Voltage

An rail-to-rail operational amplifier is presented in this paper, which is designed by with two op amp, the first level of the structure is the complementary differential structure which will providing input for the operational amplifier, the second level is designed with the structure of folding cascode to get a high gain. The operational amplifier is designed with the TSMC 0.35u m3.3VCMOS mixed analog-digital technology library. The simulated results show that the operational amplifier has a DC gain of 110dB,a GBW of 9.5MHz,a static power dissipation of 0.95mW,a phase margin of 73°,a voltage slew rate of 8.2V/μS,an input and output range of 0-3.3V,when operating at 3.3V power supply and a 20pF output load.

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A Novel Slew-Boosting Circuit for Rail-to-Rail Operational Amplifier

Journal of Circuits System and Computers ◽

10.1142/s021812662150033x ◽

2020 ◽

pp. 2150033

Author(s):

Mingyuan Ren ◽

Mengying Qin ◽

Bo Wang ◽

Xiaowei Han ◽

Changchun Dong

Keyword(s):

Operational Amplifier ◽

Operational Amplifiers ◽

Tunnel Diodes ◽

Slew Rate ◽

Mos Transistors ◽

Process Measurement ◽

Level Change ◽

Rail To Rail ◽

Measurement Results

In order to improve the slew rate of rail-to-rail operational amplifiers, this paper presents a novel slew boosting circuit. Two slew-boosting unit circuits are proposed to provide large compensation current by directly detecting the differential level change at the input terminals of the amplifier. Accordingly, the slewing performance is dynamically boosted. In each slew-boosting unit circuit, tunnel diodes are used to replace the conventional MOS transistors as loads. This circuit is designed in 1.0[Formula: see text][Formula: see text]m TVS process. Measurement results show that the rail-to-rail operational amplifier achieves a positive slew rate of 164[Formula: see text]V/[Formula: see text]s and negative slew rate of 185[Formula: see text]V/[Formula: see text]s.

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