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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 [23 Aug 2019 11:46] – Pop Andreea |
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| ===== Hardware Setup: ===== | ===== Hardware Setup: ===== |
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| 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:apn_f3.png?600 |}} | {{ :university:courses:electronics:apn_f3.png?600 |}} |
