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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 Both sides previous revision Previous revision 23 Aug 2019 13:51 amiclaus 12 Jul 2019 13:58 andreeapop 05 Mar 2019 12:31 amiclaus [Extra Challenge Activity:] 25 Jan 2019 13:43 amiclaus add ltspice files14 Dec 2018 11:43 amiclaus add Fritzing files15 Nov 2017 04:35 trecia 24 Jul 2017 16:04 amiclaus change amplitude value to peak-peak24 Apr 2017 08:37 amiclaus rename23 Mar 2017 16:28 dmercer [Materials:] 08 Apr 2013 22:14 dmercer [For Further Study:] 14 Dec 2012 21:20 dmercer [Extra Challenge Activity:] 20 Nov 2012 21:17 dmercer [Questions:] 29 Oct 2012 16:06 dmercer created 23 Aug 2019 13:51 amiclaus 12 Jul 2019 13:58 andreeapop 05 Mar 2019 12:31 amiclaus [Extra Challenge Activity:] 25 Jan 2019 13:43 amiclaus add ltspice files14 Dec 2018 11:43 amiclaus add Fritzing files15 Nov 2017 04:35 trecia 24 Jul 2017 16:04 amiclaus change amplitude value to peak-peak24 Apr 2017 08:37 amiclaus rename23 Mar 2017 16:28 dmercer [Materials:] 08 Apr 2013 22:14 dmercer [For Further Study:] 14 Dec 2012 21:20 dmercer [Extra Challenge Activity:] 20 Nov 2012 21:17 dmercer [Questions:] 29 Oct 2012 16:06 dmercer created 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​. 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​ 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​. 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​ and its actual resistance. {{ :​university:​courses:​electronics:​a18_nmos_ss.png?​300 |}} {{ :​university:​courses:​electronics:​a18_nmos_ss.png?​300 |}}