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university:courses:electronics:electronics-lab-6 [05 Mar 2019 12:29] – [Procedure] Antoniu Miclaus | university:courses:electronics:electronics-lab-6 [12 Jul 2019 13:06] – Pop Andreea |
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====== Activity 6. BJT Current Mirror ====== | ====== Activity: BJT Current Mirror ====== |
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===== Objective: ===== | ===== Objective: ===== |
===== Hardware Setup: ===== | ===== Hardware Setup: ===== |
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In the current mirror configuration, the op amp serves as a virtual ground at the mirror input (base) node to convert the voltage steps from AWG 2 ( W2 output ) into current steps through the 1KΩ resistor. The collector voltage is swept using a ramp from AWG 1(output W1) set to 3V peak to peak with the offset to 1.5V. V<sub>CE</sub> of output device Q<sub>2</sub> is measured differentially by scope inputs 1+, 1-. The mirror output current is measured by scope inputs 2+. 2- across 1KΩ resistor, R<sub>2</sub>. | In the current mirror configuration, the op amp serves as a virtual ground at the mirror input (base) node to convert the voltage steps from AWG 2 ( W2 output ) into current steps through the 1KΩ resistor. The collector voltage is swept using a ramp from AWG 1(output W1). Load the stairstep.csv file, set amplitude to 1.5 (3V peak to peak) with the offset to 1.5V. |
| V<sub>CE</sub> of output device Q<sub>2</sub> is measured differentially by scope inputs 1+, 1-. The mirror output current is measured by scope inputs 2+. 2- across 1KΩ resistor, R<sub>2</sub>. |
If you don't want to use the op-amp configuration the following simplified configuration can be used as well. | If you don't want to use the op-amp configuration the following simplified configuration can be used as well. |
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