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university:courses:electronics:electronics-lab-pn-junction-cap [12 Jul 2019 12:58]
andreeapop
university:courses:electronics:electronics-lab-pn-junction-cap [23 Aug 2019 11:46] (current)
andreeapop
Line 42: Line 42:
 ===== 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>​.
  
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university/courses/electronics/electronics-lab-pn-junction-cap.txt · Last modified: 23 Aug 2019 11:46 by andreeapop