4902_C2009_Lab9

4902_C2009_Lab9 - ECE4902 Lab 9 CMOS OP-AMP PURPOSE: The...

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Unformatted text preview: ECE4902 Lab 9 CMOS OP-AMP PURPOSE: The purpose of this lab is to measure the closed-loop performance of an op-amp designed from individual MOSFETs. This op-amp, shown in Fig. 9-1, 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 R Z , 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. Figure 9-1 . Figure 9-1. CIRCUIT: CMOS OP-AMP Youll continue working with the CMOS op-amp shown in Figure 9-1. This is the one you built in lab 8 and tested open-loop, verifying a high gain >1000. FUNCTION GENERATOR V in V out +- 1V pk 100 Hz YOUR OP-AMP HERE Figure 9-2. UNITY GAIN BUFFER (UNCOMPENSATED) L9-1. Configure the op-amp as a unity-gain buffer, shown in Fig. 9-2. Be sure the compensation capacitor C COMP and zero resistor R Z are not installed - so you see why you need them! Set the function generator to be a 1V peak, 100Hz sine wave....
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4902_C2009_Lab9 - ECE4902 Lab 9 CMOS OP-AMP PURPOSE: The...

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