Lab #5
Follow the instruction and procedures in the Student Manual, unless specified differently
in this note.
Reading:
p.102 – 122 in SM
Ch. 2.10 – 2.14 in AE
Lab #5
5-1 Follow the instruction. In this lab, you will use a new function in OSC. So far you
have used y-t mode. For the tracer, select x-y mode (press Display button and select x-y
mode in the on-screen manu). The voltage across 1k resistor is just the current going
through it in mA (Ohm’s law). So you are measuring I-V trace. Why does your OSC
image look upside down? Why do you have to use transformer instead 60 Hz from the
function generator? Pay a special attention to the GND point. There is no need to
capture the image from the oscilloscope: hand-draw curves are ok.
5-2 Follow the instruction. First of all, estimate the gain of the amplifier. Then decide
your input level considering the amplified output level (output can only swing between
GND and +Vcc). You might need to divide down the input signal to avoid clipping.
Make sure your OSC is DC coupled to see the quiescent voltage level.
5-3 Follow the instruction. Note that the pin out for the 2N3906 is different from the
2N3904 that you have been using (you can look it up quickly on the internet.) See the pin
connection diagram for CA3096 in Figure L5.7. In the Wilson mirror, at what collector
resistance value does the current start to drop? What is the Compliance?
5-4 Skip
5-5 Skip
5-6 Follow the instruction. Ignore the DC offset part. Crossover distortion means that
the output signal does not cross over GND level smoothly. Change your frequency and
watch the progression of the distortion. At higher frequency, you will see less crossover
distortion. Explain why.
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If you finish lab 5 before Feb 21, do NOT proceed to do lab 6. We will change lab
partners on Feb 21 for lab 6 to lab 10.