ScholarLens Back to search
2011•Unpublished venueRequires access

A Design Methodology of Operational Amplifier for Σ-Δ A/D Converter

Chen Yixu, Ruzhang Li, Lichun Shi

Open publisher page 0 citations

Abstract

A design methodology of operational amplifier(op-amp) for Σ-Δ A/D converter was proposed.A two-stage fully differential folded-cascode structure was adopted for the circuit.By using dynamic frequency compensation technique,frequency compensation in two operational modes was accomplished.A new common-mode feedback(CMFB) structure was proposed to achieve higher stability of common-mode level.The circuit was implemented using 0.35 μm mixed-signal technology.Simulation results indicated that the op-amp had a DC voltage gain of 120.5 dB and an output swing of ±4.2 V at 5 V supply voltage.

About this research paper

What this paper is about

A design methodology of operational amplifier(op-amp) for Σ-Δ A/D converter was proposed.A two-stage fully differential folded-cascode structure was adopted for the circuit.By using dynamic frequency compensation technique,frequency compensation in two operational modes was accomplished.A new common-mode feedback(CMFB) structure was proposed to achieve higher stability of common-mode level.The circuit was implemented using 0.35 μm mixed-signal technology.Simulation results indicated that the op-amp had a DC voltage gain of 120.5 dB and an output swing of ±4.2 V at 5 V supply voltage.

Why it matters

A significance statement is not available in the OpenAlex record.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

A design methodology of operational amplifier(op-amp) for Σ-Δ A/D converter was proposed.A two-stage fully differential folded-cascode structure was adopted for the circuit.By using dynamic frequency compensation technique,frequency compensation in two operational modes was accomplished.A new common-mode feedback(CMFB) structure was proposed to achieve higher stability of common-mode level.The circuit was implemented using 0.35 μm mixed-signal technology.Simulation results indicated that the op-amp had a DC voltage gain of 120.5 dB and an output swing of ±4.2 V at 5 V supply voltage.

Key concepts: Operational amplifier, Compensation (psychology), Cascode, Electronic engineering, Op amp integrator, Operational transconductance amplifier, Phase margin, Swing

Related papers

Related paper 1Related paper 2Related paper 3
Back to paper searchBrowse research topicsOriginal source
A Design Methodology of Operational Amplifier for Σ-Δ A/D Converter — Research Paper | ScholarLens