Date of Graduation

5-2019

Document Type

Thesis

Degree Name

Bachelor of Science in Electrical Engineering

Degree Level

Undergraduate

Department

Electrical Engineering

Advisor/Mentor

Mantooth, H. Alan

Abstract

This thesis work details the designing process of two silicon two-stage operational amplifiers with indirect feedback compensation and with Miller compensation technique. The main objective of this thesis is to study the advantages of indirect feedback compensation in comparison with Miller compensation and how this technique can be applied to meet certain design specifications. The operational amplifiers are designed with 130 nm Silicon Germanium CMOS process ideally for temperature range of 25°C to 300°C. The two op-amps are designed to have a DC gain of about 70 dB and 60 degrees of phase margin. The indirect feedback compensation design showed similar simulation results as the Miller compensation technique; nevertheless, it showed a reduce in the compensation capacitor size, meaning a smaller design area, and an improvement in the phase margin from the LHP zero. Also, the proposed design showed a higher unity gain frequency. Further analysis of indirect feedback frequency compensation on multistage amplifiers (greater than two) should be conducted to analyze the potential of this compensation method under more complex compensation against the commonly used Miller technique.

Keywords

IC; amplifier; op-amps; two-stage amplifier; miller compensation; indirect feedback compensation

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