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A Design of Fully Differential Gain-Boosted Operational Amplifier

Shi Zhifen

Open publisher page 1 citations

Abstract

A fully differential op-amp used in a high speed ADC is designed. This operational amplifier is consisted of a main OTA in folded cascade,four single-ended auxiliary OTA and a modified switched capacitor common mode feedback circuit. Gain-boosted technique has been introduced. Based on SMIC 0. 18 μm,1. 8 V process,Simulation has been run in Spectre under Cadence platform. The result shows that DC-gain of the amplifier is as high as 115 d B,unity-gain bandwidth is 805 MHz and the power consumption is 10. 5 m W. And it can reach an accuracy of 0. 01% within 8 ns. This amplifier is specially used in a high speed pipelined ADC.

About this research paper

What this paper is about

A fully differential op-amp used in a high speed ADC is designed. This operational amplifier is consisted of a main OTA in folded cascade,four single-ended auxiliary OTA and a modified switched capacitor common mode feedback circuit. Gain-boosted technique has been introduced. Based on SMIC 0. 18 μm,1. 8 V process,Simulation has been run in Spectre under Cadence platform. The result shows that DC-gain of the amplifier is as high as 115 d B,unity-gain bandwidth is 805 MHz and the power consumption is 10. 5 m W. And it can reach an accuracy of 0. 01% within 8 ns. This amplifier is specially used in a high speed pipelined ADC.

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Available abstract

A fully differential op-amp used in a high speed ADC is designed. This operational amplifier is consisted of a main OTA in folded cascade,four single-ended auxiliary OTA and a modified switched capacitor common mode feedback circuit. Gain-boosted technique has been introduced. Based on SMIC 0. 18 μm,1. 8 V process,Simulation has been run in Spectre under Cadence platform. The result shows that DC-gain of the amplifier is as high as 115 d B,unity-gain bandwidth is 805 MHz and the power consumption is 10. 5 m W. And it can reach an accuracy of 0. 01% within 8 ns. This amplifier is specially used in a high speed pipelined ADC.

Key concepts: Fully differential amplifier, Open-loop gain, Cadence, Operational amplifier, Gain–bandwidth product, Amplifier, Direct-coupled amplifier, Differential amplifier

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