Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
|
university:courses:electronics:electronics-lab-pn-junction-cap [12 Jul 2019 12:58] Pop Andreea |
university:courses:electronics:electronics-lab-pn-junction-cap [25 Jun 2020 22:07] external edit |
||
|---|---|---|---|
| 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>. |
| {{ :university:courses:electronics:apn_f3.png?600 |}} | {{ :university:courses:electronics:apn_f3.png?600 |}} | ||
| Line 111: | Line 111: | ||
| <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> | ||
university/courses/electronics/electronics-lab-pn-junction-cap.txt · Last modified: 27 Jan 2021 22:36 by Robin Getz