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university:courses:electronics:electronics-lab-pn-junction-cap [12 Jul 2019 12:58]
Pop Andreea
university:courses:electronics:electronics-lab-pn-junction-cap [27 Jan 2021 22:36] (current)
Robin Getz use wp> interwiki links
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 For further reading on PN junction depletion region: For further reading on PN junction depletion region:
  
-[[http://​en.wikipedia.org/​wiki/​Depletion_region|Depletion Region]]+[[wp>Depletion_region|Depletion Region]]
  
 ===== Materials: ===== ===== Materials: =====
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 ===== Hardware Setup: ===== ===== Hardware Setup: =====
  
-Using the Network Analyzer instrument in the Scopy software obtain a gain (attenuation) vs. frequency plot from 5 kHz to 10 MHz. Scope channel 1 is the "​filter"​ input and scope channel 2 is the "​filter"​ output. Set AWG offset to 1V and the Amplitude to 200mV. The offset value is not important at this point when measuring a simple real capacitor but will be used as the reverse bias voltage when we measure diodes in later steps. Set the vertical scale to start at 1dB to -50 dB range. Run a single sweep and export the data to a .csv file. You should notice a high pass characteristic that has a high attenuation at very low frequencies where the impedance of the capacitor is large compared to R<​sub>​1</​sub>​. At the very high end of the frequency sweep there should be a relatively flat region where the impedance of the C<​sub>​1</​sub>,​ C<​sub>​m</​sub>​capacitive voltage divider is much lower than R<​sub>​1</​sub>​.+Using the Network Analyzer instrument in the Scopy software obtain a gain (attenuation) vs. frequency plot from 5 kHz to 10 MHz. Scope channel 1 is the "​filter"​ input and scope channel 2 is the "​filter"​ output. Set AWG offset to 1V and the Amplitude to 200mV peak-to-peak ​. The offset value is not important at this point when measuring a simple real capacitor but will be used as the reverse bias voltage when we measure diodes in later steps. Set the vertical scale to start at 1dB to -50 dB range. Run a single sweep and export the data to a .csv file. You should notice a high pass characteristic that has a high attenuation at very low frequencies where the impedance of the capacitor is large compared to R<​sub>​1</​sub>​. At the very high end of the frequency sweep there should be a relatively flat region where the impedance of the C<​sub>​1</​sub>,​ C<​sub>​m</​sub>​capacitive voltage divider is much lower than R<​sub>​1</​sub>​.
  
 {{ :​university:​courses:​electronics:​apn_f3.png?​600 |}} {{ :​university:​courses:​electronics:​apn_f3.png?​600 |}}
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 {{ :​university:​courses:​electronics:​apn_e1.png?​220 |}} {{ :​university:​courses:​electronics:​apn_e1.png?​220 |}}
  
-[[http://​en.wikipedia.org/​wiki/​Voltage_divider#​Capacitive_divider|Capacitive Dividers]]+[[wp>Voltage_divider#​Capacitive_divider|Capacitive Dividers]]
  
 ===== Directions Step 2: ===== ===== Directions Step 2: =====
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 <WRAP round download>​ <WRAP round download>​
 ** Lab Resources ** ** Lab Resources **
-  * Fritzing files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​fritzing/​volt_dep_cap_pn_junc_bb | v_dep_pn_bb]] +  * Fritzing files: [[downgit>education_tools/​tree/​master/​m2k/​fritzing/​volt_dep_cap_pn_junc_bb | v_dep_pn_bb]] 
-  * LTSpice files: [[ https://​minhaskamal.github.io/​DownGit/#/​home?​url=https://​github.com/​analogdevicesinc/​education_tools/​tree/​master/​m2k/​ltspice/​v_dep_pn_ltspice | v_dep_pn_ltspice]]+  * LTSpice files: [[downgit>education_tools/​tree/​master/​m2k/​ltspice/​v_dep_pn_ltspice | v_dep_pn_ltspice]]
 </​WRAP>​ </​WRAP>​
  
 ==== For Further Reading: ==== ==== For Further Reading: ====
-[[http://​en.wikipedia.org/​wiki/​Varicap|The Varactor Diode, Varicaps]]+[[wp>Varicap|The Varactor Diode, Varicaps]]
  
 **Return to the Lab Activity [[university:​courses:​electronics:​labs|Table of Contents]]** **Return to the Lab Activity [[university:​courses:​electronics:​labs|Table of Contents]]**
university/courses/electronics/electronics-lab-pn-junction-cap.txt · Last modified: 27 Jan 2021 22:36 by Robin Getz