Document Type thesis Author Name Ozbas, Halil I URN etd-050505-105548 Title High-Gain Transimpedance Amplifier With DC Photodiode Current Rejection Degree MS Department Electrical & Computer Engineering Advisors Brian M. King, Advisor John A. McNeill, Committee Member Shela J. Aboud, Committee Member Keywords high-gain transimpedance tia differential dc rejection dc photodiode current cancellation bilinear automatic gain control optical cohesion tomography oct Date of Presentation/Defense 2005-04-27 Availability unrestricted
This master's thesis deals with the design of a differential high-gain transimpedance amplifier in TSMC's 0.18 um mixed signal process that utilizes a DC photodiode current cancellation loop and a switching automatic gain control (AGC) with a bilinear gain curve.
The amplifier is designed to satisfy the demands of Optical Coherence Tomography applications where the receiver is expected to measure the envelope power of an amplitude modulated sinusoidal optical signal that incorporates a large DC component. Methods of increasing dynamic range and gain linearity through the use of DC photodiode current cancellation and bilinear gain are explored. Effects of changing DC photodiode current on the overall system response is also demonstrated.
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