# lab4 - ECE 323 Project 4 Fall 2009 Write-up Due 12/1 1...

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ECE 323: Project 4, Fall 2009 Write-up Due: 12/1 1 University of Massachusetts Department of Electrical and Computer Engineering ECE 323 Electronics I Fall 2009 Project 4: Testing Inverters Dr. Designsalot was impressed with Charlie’s skill in the electronics lab, so he asked him to help him with a problem. Dr. Designsalot could not find the inverters that he normally uses, so he had to order a different brand. He is unsure of the device characteristics for these new inverters so he asked Charlie to characterize them for him in lab.

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ECE 323: Project 4, Fall 2009 Write-up Due: 12/1 2 1.0 Parameters To Measure Dr. Designsalot wants to know: Name Symbol Inverter Threshold V th Input Low Voltage V IL Input High Voltage V IH Noise Margin High NM H Noise Margin Low NM L Input Capacitance C in Max Sink Current I sink Max Source Current I source Propagation Delay t p For the three inverters in the HCF4007 IC made by connecting pins 13 with 8 and 1 with 5. 2.0 Test Design Charlie started by designing circuits to test each of the parameters. He recognized that he would need different circuit configurations to most easily measure each parameter. 2.1 DC Transfer Characteristics In order to measure V th , V IL , V IH , NM H , and NM L , Charlie would sweep the input voltage and measure the output voltage as shown in Fig. 1. He found Sedra and Smith defined each of these parameters in Section 4.10 and 10.1.2.
ECE 323: Project 4, Fall 2009 Write-up Due: 12/1 3 Figure 1: Circuit for Testing DC Characteristics Draw the circuit the way it will look on the breadboard with the HCF4007 IC package and pins numbered.

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