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| university:courses:electronics:electronics-lab-18 [05 Mar 2019 12:31] – [Extra Challenge Activity:] Antoniu Miclaus | university:courses:electronics:electronics-lab-18 [02 Feb 2023 21:17] (current) – [Activity: The CMOS Analog Switch] Doug Mercer |
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| ====== Activity 18. The CMOS Analog Switch====== | ======Activity: The CMOS Analog Switch - ADALM2000====== |
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| ===== Objective: ===== | ===== Objective: ===== |
| 1 - 4.7 KΩ resistor\\ | 1 - 4.7 KΩ resistor\\ |
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| {{ :university:courses:electronics:cd4007.png?400 |}} | {{ :university:courses:alm1k:cd4007_pinout.png?400 |}} |
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| <WRAP centeralign> CD4007 CMOS transistor array pinout </WRAP> | <WRAP centeralign> CD4007 CMOS transistor array pinout </WRAP> |
| ===== 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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| ==== For Further Study: ====== | ==== For Further Study: ====== |
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| ADI Mini Tutorial on [[http://www.analog.com/static/imported-files/tutorials/MT-088.pdf|Analog Switches]]\\ | ADI Mini Tutorial on [[adi>static/imported-files/tutorials/MT-088.pdf|Analog Switches]]\\ |
| R<sub>ON</sub> Modulation in CMOS [[http://www.analog.com/static/imported-files/tech_articles/99941520Ron_Modulati_Whitepaper.pdf|Switches and Multiplexers]] | R<sub>ON</sub> Modulation in CMOS [[adi>static/imported-files/tech_articles/99941520Ron_Modulati_Whitepaper.pdf|Switches and Multiplexers]]\\ |
| | [[adi>library/analogdialogue/archives/45-05/switch_mux.html|Switches and Multiplexers]]\\ |
| | [[adi>media/en/analog-dialogue/raqs/raq-issue-173.pdf|On Building Physically Accurate Analog Switch Macromodels]] |
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| ====== Extra Challenge Activity: ====== | ====== Extra Challenge Activity: ====== |
| <WRAP round download> | <WRAP round download> |
| **Resources:** | **Resources:** |
| * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/cmos_analog_sw_bb | cmos_analog_sw_bb]] | * Fritzing files: [[downgit>education_tools/tree/master/m2k/fritzing/cmos_analog_sw_bb | cmos_analog_sw_bb]] |
| * LTspice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/cmos_analog_sw_ltspice | cmos_analog_sw_ltspice ]] | * LTspice files: [[downgit>education_tools/tree/master/m2k/ltspice/cmos_analog_sw_ltspice | cmos_analog_sw_ltspice ]] |
| </WRAP> | </WRAP> |
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| **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]** | **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]** |
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