Hw2 - posted on the website 3 CMFB circuits Use a CT CMFB circuit without CM sensing resistors 4 Simulate the open-loop gain vs the output

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1 U NIVERSITY OF T EXAS AT D ALLAS Erik Jonsson School of Electrical Engineering and Computer Science EECT 7329 Homework Assignment #2 (Assigned 10/6, due 10/20 in class) Objective In this assignment, you are asked to revise your five-transistor differential amplifier into a folded- cascode differential amplifier with CMFB. Again, set the overdrive voltages of all transistors in your design to 100-200 mV and the total current consumption (of all four branches) of your amplifier to 4 mA. Follow the directions below for your design. This amplifier will be used in future assignments of noise/feedback analysis. 1. Refer to HW #1 for specs of the amplifier, e.g., CM levels, loading, etc. Your output swing should be at least 2.5 V (peak-to-peak differential). 2. Biasing circuit. You are allowed for one ideal floating current source of 1 mA. You can construct current mirrors using this ideal source. For cascode biasing, refer to the handout
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Unformatted text preview: posted on the website. 3. CMFB circuits. Use a CT CMFB circuit without CM sensing resistors. 4. Simulate the open-loop gain vs. the output differential voltage. Check that all transistors remain in saturation at the maximum output swing of ± 1.25 V. 5. Simulate the open-loop frequency response and produce the Bode plot. Determine the unity-gain bandwidth, second pole frequency and the phase margin. Report Guideline Write a concise report, not exceeding three pages for text and two pages for figures. It is very important that you show your results clearly. Please typewrite your report with simulation results/figures attached. Teamwork Policy Individual works are expected. Discussion with others in class is encouraged. However, please submit a genuine report and/or design. No sharing of SPICE decks ....
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This note was uploaded on 03/19/2012 for the course EE 7329 at University of Texas at Dallas, Richardson.

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