A High Input Impedance Readout Integrated Circuit based on Continuous-Time Sigma-Delta Modulator with FIR DAC Feedback
YU, Jinqian (TU Delft Electrical Engineering, Mathematics and Computer Science)
Nihtianova, S. (mentor)
Degree granting institution
Jiang, Hui (mentor)
Gao, C. (graduation committee)
Delft University of Technology
Electrical Engineering | Microelectronics
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.
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