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Unformatted text preview: ECE4902 Lab 8 CMOS OP-AMP PURPOSE: The purpose of this lab is to measure the performance of an op-amp designed from individual MOSFETs. This op-amp, shown in Fig. 8-1, combines all of the major circuit techniques we have been developing this term: Differential pair M1-M2(input stage) Common source amplifier M5(output stage) Current source with "bias rail" M6, M7, M8 (bias for differential pair and output stage) Current mirror load M3-M4 (for input stage high gain and single-ended to differential conversion) Active load M8 (for common source stage) Compensation using C COMP and the Miller effect (for stability) NOTE: Be sure to record ALL results in your laboratory notebook. NOTE: This lab involves construction and measurement of circuits with very high gains. It is extremely important to use bypass capacitors C BP1 and C BP2 on the supply rail(s) to keep the power supply voltages clean. Also, keep wire leads as short as possible to prevent noise coupling into the circuit. NOTE: DO NOT DISASSEMBLE THIS CIRCUIT AT THE END OF THE LAB! YOU WILL USE THIS CIRCUIT (ADDING C COMP ) IN THE NEXT LAB! M 1 M 4 M 3 M 2 M 5 M 7 M 8 M 6 V- v out V G5 V DD = +5V V SS = -5V V + V G3 V S1 V G6 900 10 350 10 All P: All N: 1 2 14 13 12 11...
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This note was uploaded on 10/13/2009 for the course ECE 4902 taught by Professor Mcneill during the Spring '01 term at WPI.
- Spring '01
- Integrated Circuit