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university:courses:electronics:electronics-lab-13a [30 Oct 2017 04:53] – Trecia Agoylo | university:courses:electronics:electronics-lab-13a [24 Jan 2023 20:03] – [Activity: Amplifier Output Stages] Doug Mercer | ||
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- | ====== Activity | + | ====== Activity: Amplifier Output Stages |
===== Objective: ===== | ===== Objective: ===== | ||
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===== Procedure: ===== | ===== Procedure: ===== | ||
- | The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak amplitude | + | The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak-to-peak |
{{ : | {{ : | ||
<WRAP centeralign> | <WRAP centeralign> | ||
- | Next, apply power and adjust the waveform generator so that W1 is a 100 Hz triangle wave with 0V offset and 3.0 V amplitude | + | Next, apply power and adjust the waveform generator so that W1 is a 100 Hz triangle wave with 0V offset and 3.0 V amplitude |
{{ : | {{ : | ||
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• Starting with the amplitude = 0 V, gradually increase it until you just begin to see a signal on scope channel 2 appear at the output. For what range of amplitude values of W1 can we say that both BJT's are essentially off? Confirm this by observing the voltages of the current-sensing resistances R< | • Starting with the amplitude = 0 V, gradually increase it until you just begin to see a signal on scope channel 2 appear at the output. For what range of amplitude values of W1 can we say that both BJT's are essentially off? Confirm this by observing the voltages of the current-sensing resistances R< | ||
- | • Raise W1 to 6.0V amplitude value, and record the amplitude of the output waveform as well as the collector currents of the BJTs, which can be found via Ohm's law from the voltages across R< | + | • Raise W1 to 6.0V amplitude |
- | • Repeat, but with W1 raised a 10.0V amplitude value; and comment. | + | • Repeat, but with W1 raised a 10.0V amplitude |
Simulate the circuit of figure 1 using QUCS, compare with your lab findings, and justify any differences. | Simulate the circuit of figure 1 using QUCS, compare with your lab findings, and justify any differences. | ||
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===== Procedure: ===== | ===== Procedure: ===== | ||
- | The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak amplitude | + | The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak-to-peak |
{{ : | {{ : | ||
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===== Procedure: ===== | ===== Procedure: ===== | ||
- | The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak amplitude | + | The waveform generator, W1, should be configured for a 1 KHz sine wave with 6.0 volt amplitude peak-to-peak |
{{ : | {{ : | ||
<WRAP centeralign> | <WRAP centeralign> | ||
+ | |||
+ | ** Lab Resources: | ||
+ | * LTSpice files: [[downgit> | ||
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Using your scope input, measure Vout as well as the voltage across R< | Using your scope input, measure Vout as well as the voltage across R< | ||
- | Measure the input impedance by inserting a 10K? resistor in series with the signal generator (between W1 and the bases of Q< | + | Measure the input impedance by inserting a 10KΩ resistor in series with the signal generator (between W1 and the bases of Q< |
- | Simulate the circuit of figure 3 using QUCS, compare with your lab findings, and justify any differences. | + | Simulate the circuit of figure 3 using LTSpice or ADIsimPE, compare with your lab findings, and justify any differences. |
+ | <WRAP round download> | ||
+ | **Resources: | ||
+ | * Fritzing files: [[downgit> | ||
+ | * LTspice files: [[downgit> | ||
+ | </ | ||
==== For Further reading: ==== | ==== For Further reading: ==== | ||
- | Output Stages [[http:// | + | Output Stages [[adi>static/ |
- | [[http:// | + | [[wp>Push-pull_output|Push-Pull Outputs]] |
+ | |||
**Return to Lab Activity [[university: | **Return to Lab Activity [[university: |