FPAA Implementation of a Delta-Sigma Modulator Leakage Measurement Technique
Date Issued
2010
Date
2010
Author(s)
Du, Nian-Tze
Abstract
In this thesis, we implement a Design-for-Test (DfT) technique to measure the integrator leakage of ΔΣ modulator. We use Field Programmable Analog Array (FPAA) to implement the ΔΣ modulator and utilize DC voltage as the test stimulus. The integrator leakage testing method is base on integrator charging/discharging; it is an iterative three-phase approach. In phase I, the integrator is charged with a constant DC input to reach a stable, leakage-dependent voltage level. In phase II, the integrator is gradually discharged. The time of discharging is recorded and used to derive the integrator leakage. In phase III, it is determined whether a new iteration can be executed to further enhance the test accuracy.
The field programmable analog array device is based on the switched capacitor technology. It is composed of four configurable analog blocks, seven IO cells, a clock generator, and configuration interface. The basic configurable analog block is composed of two operational amplifiers, a comparator and eight capacitor arrays. Circuits are realized through manipulation of switches between various circuit components inside the configurable analog block. Using field programmable analog array to design circuit will save us a lot of time and money.
We use the field programmable analog array to design a ΔΣ modulator with tunable integrator leakage and utilize DAQ to generate the test signal and acquire the output signal from FPAA. According to the experimental result, we improve the test method to achieve better accuracy --- the maximum error is reduced from 1.89% to 1.17%.
Subjects
FPAA
delta-sigma modulator
leakage
Type
thesis
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