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university:courses:electronics:electronics-lab-18 [12 Jul 2019 13:58] – Pop Andreea | university:courses:electronics:electronics-lab-18 [23 Aug 2019 13:51] – Antoniu Miclaus |
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===== Procedure: ===== | ===== Procedure: ===== |
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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 |}} |
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