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university:courses:electronics:electronics-lab-nr [24 Apr 2017 08:56] – rename Antoniu Miclaus | university:courses:electronics:electronics-lab-nr [23 Aug 2019 14:06] – Antoniu Miclaus |
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Open the voltage supply control and the voltmeter instrument windows from the Scopy software. A DMM, if available, could be useful to more accurately measure the DC voltages in the circuit than the Scopy voltmeter instrument. | Open the voltage supply control and the voltmeter instrument windows from the Scopy software. A DMM, if available, could be useful to more accurately measure the DC voltages in the circuit than the Scopy voltmeter instrument. |
| {{ :university:courses:electronics:anr_f2bb.png? |}} |
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| <WRAP centeralign> Figure 3 LED based volt regulator breadboard connections </WRAP> |
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=====Procedure:===== | =====Procedure:===== |
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Turn on both the positive and negative power supplies. Observe the two voltages at -V<sub>REF</sub>, pins 8 and 14 of the op amp and at +V<sub>REF</sub> on the LED. | Turn on both the positive and negative power supplies. Observe the two voltages at -V<sub>REF</sub>, pins 8 and 14 of the op amp and at +V<sub>REF</sub> on the LED. |
| {{ :university:courses:electronics:anr_f2ss.png?600 |}} |
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| <WRAP centeralign> Figure 4 Scopy voltmeter</WRAP> |
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=====Questions:===== | =====Questions:===== |
{{ :university:courses:electronics:anr_f3.png?600 |}} | {{ :university:courses:electronics:anr_f3.png?600 |}} |
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<WRAP centeralign> Figure 3, NPN shunt band-gap reference example </WRAP> | <WRAP centeralign> Figure 5 NPN shunt band-gap reference example </WRAP> |
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=====Hardware setup:===== | =====Hardware setup:===== |
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The setup is the same as step 1. | The setup is the same as step 1. |
| {{ :university:courses:electronics:anr_f6.png? |}} |
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| <WRAP centeralign> Figure 6 LED based volt regulator example </WRAP> |
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=====Procedure:===== | =====Procedure:===== |
====Testing supply headroom==== | ====Testing supply headroom==== |
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To test the headroom requirements for +V<sub>DD</sub>, disconnect the fixed positive power supply from +V<sub>DD</sub> and remove any supply decoupling capacitors. Be sure to turn off the power supplies before making any changes or additions to your breadboard. Now connect +V<sub>DD</sub> to AWG 1. Set AWG 1 to trapezium (trapezoid) waveform at 100 Hz. Set the amplitude to 2.5V with a 2.5V offset for a 0 to +5V swing. Connect scope channel 1 to the output of AWG1 and connect scope channel 2 to -V<sub>REF</sub> of the first example circuit at pin 14 of the OP482. Use the oscilloscope instrument in the XY mode, scope channel for X and scope channel 2 for Y. Start AWG 1 and turn on the fixed negative 5V power supply. Record the minimum +V<sub>DD</sub> voltage where -V<sub>REF</sub> starts to remain constant at -1.25V. | To test the headroom requirements for +V<sub>DD</sub>, disconnect the fixed positive power supply from +V<sub>DD</sub> and remove any supply decoupling capacitors. Be sure to turn off the power supplies before making any changes or additions to your breadboard. Now connect +V<sub>DD</sub> to AWG 1. Set AWG 1 to trapezium (trapezoid) waveform at 100 Hz. Set the amplitude to 5V peak-to-peak with a 2.5V offset for a 0 to +5V swing. Connect scope channel 1 to the output of AWG1 and connect scope channel 2 to -V<sub>REF</sub> of the first example circuit at pin 14 of the OP482. Use the oscilloscope instrument in the XY mode, scope channel for X and scope channel 2 for Y. Start AWG 1 and turn on the fixed negative 5V power supply. Record the minimum +V<sub>DD</sub> voltage where -V<sub>REF</sub> starts to remain constant at -1.25V. |
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To test the headroom requirements for -V<sub>SS</sub>, reconnect +V<sub>DD</sub> to the fixed positive power supply. Disconnect the fixed negative power supply from -V<sub>SS</sub> and remove any supply decoupling capacitors. Now connect -V<sub>SS</sub> to AWG 1. Set the amplitude to 2.5V with a -2.5V offset for a 0 to -5V swing. Start AWG 1 and turn on the fixed positive 5V power supply. Repeat your measurements of pins 14 of the OP482 recording the lowest value for -V<sub>SS</sub> where the reference voltage is constant. | |
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=====Questions:===== | |
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| To test the headroom requirements for -V<sub>SS</sub>, reconnect +V<sub>DD</sub> to the fixed positive power supply. Disconnect the fixed negative power supply from -V<sub>SS</sub> and remove any supply decoupling capacitors. Now connect -V<sub>SS</sub> to AWG 1. Set the amplitude to 5V peak-to-peak with a -2.5V offset for a 0 to -5V swing. Start AWG 1 and turn on the fixed positive 5V power supply. Repeat your measurements of pins 14 of the OP482 recording the lowest value for -V<sub>SS</sub> where the reference voltage is constant. |
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=====Directions Step 3:===== | =====Directions Step 3:===== |
{{ :university:courses:electronics:anr_f4.png?600 |}} | {{ :university:courses:electronics:anr_f4.png?600 |}} |
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<WRAP centeralign> Figure 4, NPN three terminal band-gap reference example </WRAP> | <WRAP centeralign> Figure 7 NPN three terminal band-gap reference example </WRAP> |
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=====Hardware setup:===== | =====Hardware setup:===== |
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The setup is the same as step 1. | The setup is the same as step 1. |
| {{ :university:courses:electronics:anr_f8.png? |}} |
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| <WRAP centeralign> Figure 8 LED based volt regulator example </WRAP> |
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=====Procedure:===== | =====Procedure:===== |
Repeat the supply headroom tests you did in Step 2 for this configuration. Are there any differences? | Repeat the supply headroom tests you did in Step 2 for this configuration. Are there any differences? |
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| <WRAP round download> |
| **Resources:** |
| * Fritzing files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/fritzing/neg_voltage_ref_bb | neg_voltage_ref_bb]] |
| * LTspice files: [[ https://minhaskamal.github.io/DownGit/#/home?url=https://github.com/analogdevicesinc/education_tools/tree/master/m2k/ltspice/neg_voltage_ref_ltspice | neg_voltage_ref_ltspice]] |
| </WRAP> |
====For further reading:==== | ====For further reading:==== |
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====Appendix:==== | ====Appendix:==== |
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