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university:courses:electronics:electronics-lab-18 [25 Jan 2019 13:43] – add ltspice files Antoniu Miclausuniversity:courses:electronics:electronics-lab-18 [23 Aug 2019 13:51] – Antoniu Miclaus
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-====== Activity 18. The CMOS Analog Switch======+====== Activity: The CMOS Analog Switch======
  
 ===== Objective: ===== ===== Objective: =====
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 ===== 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 |}}
  
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 Try measuring the Ron vs input voltage for other CMOS analog switches such as the CD4016, CD4066 quad switches or the CD4051, CD4052, and CD4053 analog multiplexers or the ADG419 SPDT analog switch or ADG333 quad SPDT switch. Compare your results to the Ron specified in the manufacturer product datasheets. Try measuring the Ron vs input voltage for other CMOS analog switches such as the CD4016, CD4066 quad switches or the CD4051, CD4052, and CD4053 analog multiplexers or the ADG419 SPDT analog switch or ADG333 quad SPDT switch. Compare your results to the Ron specified in the manufacturer product datasheets.
  
 +<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: [[ 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]]
   * 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: [[ 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 ]]
 +</WRAP>
  
 **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]** **Return to Lab Activity [[university:courses:electronics:labs|Table of Contents]]**
  
university/courses/electronics/electronics-lab-18.txt · Last modified: 02 Feb 2023 21:17 by Doug Mercer

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