June 2021 StudentZone Quiz Solution

Question 1:

For the circuit in figure 8, would you characterize this transistor amplifier as being inverting or non-inverting to outputs 2+ and 2- with the base terminal of transistor Q1 being considered the input?

Answer 1:

By analyzing the plot for the circuit in figure 8, we can notice that the there is a 180-degree phase shift between the input trace and the output trace, therefore we can conclude that the amplifier has an inverting behavior.

Question 2:

For the same circuit, describe what happens to each of the output voltages (2+ and 2-) as the input voltage (W1) increases, decreases.

Answer 2:

The easiest way to analyze the output/input relationship with respect tot the amplitude is to simulate the circuit using LTspice software, or using the ADALM2000/Scopy setup. By increasing the input voltage amplitude, we will notice an increase in the amplitude of the output voltage.By decreasing the input voltage amplitude, we will notice a decrease in the amplitude of the output voltage. Therefore, we can conclude that the input/output voltage out the circuit are directly proportional.