A High Input Impedance Readout Integrated Circuit based on Continuous-Time Sigma-Delta Modulator with FIR DAC Feedback
J. YU (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Stoyan Nihtianova – Mentor (TU Delft - Electronic Instrumentation)
Hui Jiang – Mentor (Silicon Integrated B.V.)
C. Gao – Graduation committee member (TU Delft - Electronics)
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Abstract
This thesis focuses on the design of a high input impedance sensor readout system based on a continuous-time sigma-delta modulator with finite-impulse-response digital-to-analog converter feedback.
Both the system-level and circuit-level design techniques of this system are investigated. The concept and design methods of finite-impulse-response digital-to-analog converters are introduced. The first integrator with source degeneration resistors and an input Gm-boosting cell is designed to achieve high input impedance and linearity. Both simulation and post-layout simulation results confirm the expected effective number of bits of 15 bits in the readout performance. The design is fabricated in a standard 180nm CMOS technology.