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Analysis and Design of Common Mode Feedback Circuit for a Delta Sigma Modulator in 180 nm Technology

Keywords: common mode feedback , harmonic distortion , miller compensation , fully differential.

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The paper involves the simulation and design of a fully differential common mode feedback circuit for a two stage Oper`ational Transconductance Amplifier. This OTA serves as the loop filter for a delta sigma modulator in 180nm Technology. Simulations were performed in Cadence software. Step response and ac analysis of the OTA was also conducted. The nonlinearity characteristics of OTA were studied by performing Harmonic Distortion Analysis.


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