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university:courses:electronics:electronics-lab-18 [12 Jul 2019 13:58]
andreeapop
university:courses:electronics:electronics-lab-18 [23 Aug 2019 13:51] (current)
amiclaus
Line 38: Line 38:
 ===== Procedure: ===== ===== Procedure: =====
  
-Configure waveform generator 1 as a 100 Hz triangle wave with an amplitude of 9 volts and an offset of +500 mV. This will swing the voltage on the NMOS switch transistor from +5 volts to -4 volts. We can not swing the voltage all the way to -5 volts because of the NPN current source Q<​sub>​2</​sub>​. Be sure to turn on the external user power supplies (Vp and Vn) before running the waveform generator. Configure the scope screen in XY mode with C1 on the X axis, and C2 (the voltage across the switch) on the Y axis. Use the math function to calculate the resistance (C2 / 1mA). Note: You can get a more precise estimate of the current source by measuring the voltage across R<​sub>​1</​sub>​ and its actual resistance.+Configure waveform generator 1 as a 100 Hz triangle wave with an amplitude of 9 volts peak-to-peak ​and an offset of +500 mV. This will swing the voltage on the NMOS switch transistor from +5 volts to -4 volts. We can not swing the voltage all the way to -5 volts because of the NPN current source Q<​sub>​2</​sub>​. Be sure to turn on the external user power supplies (Vp and Vn) before running the waveform generator. Configure the scope screen in XY mode with C1 on the X axis, and C2 (the voltage across the switch) on the Y axis. Use the math function to calculate the resistance (C2 / 1mA). Note: You can get a more precise estimate of the current source by measuring the voltage across R<​sub>​1</​sub>​ and its actual resistance.
 {{ :​university:​courses:​electronics:​a18_nmos_ss.png?​300 |}} {{ :​university:​courses:​electronics:​a18_nmos_ss.png?​300 |}}
  
university/courses/electronics/electronics-lab-18.txt · Last modified: 23 Aug 2019 13:51 by amiclaus