matlab toolbox by Richard Schreier
Simulink toolbox by Prof. Maloberti
chapter 6 is delta sigma Simulink models.
Additional Matlab Functions need to be downloaded and included (use "addpath" to include the library).
Delta Sigma Toolbox by Malcovati in Matlab R2009b. (might not be compatible with newer versions.)
A good reference of z-domain lecture at NCTU OCW by Prof. S. F. Hsieh
Malcovati's SDToolbox2 can be download on Matlab file exchange.
Reference for non-idealities by Malcovati's TCAS-1.
Boser's JSSC on feedback modulator.
(assigned on 4/2/2020; 5-minutes presentation in class on 4/9/2020).
Download the simulink/matlab file from Maloberti's data converter website. Ch 6 is for delta sigma modulators.
You are given a specification: 14-bit SQNR 2.5 MHz bandwidth, using a second-order delta sigma modulator with 1-bit internal quantizer. (Example: using Maloberti's Ex6_3. You are free to change the feedback architecture to any other architecture.)
You need to show: (1) SQNR vs. input amplitude. (2) noise-shaping spectrum of peak SQNR. (3) others you want to show.
(assign: 4/14/2020, due date: 4/21/2020. email your softcopy to me or TAs.)
Re-work your homework3 (feedback or feedforward or whatever you like). You are required to add these nonideality:
opamp finite gain. Show your SQNR vs. opamp's DC gain.
integrator saturation should be limited within +0.7*VREF and -0.7*VREF. add a "saturation". You are required to design the modulator's coefficient and do some manual scaling. Show the histogram of two integrators' output. (use "histogram" in Matlab.)
Clearly show the coefficients of your modulator. Explain your design!
Design a 100 dB SQNR for 2.5 MHz bandwidth. OSR should be less than 100.
The other requirements are as same as HW4.