g. A series RL circuit is called a highpass filter when the
output is taken across the inductor. A series RL circuit is called a
lowpass filter when the output is taken across the resistor.
(Paragraph 31e)
h. The longer the time constant in a highpass filter, the more
closely the original waveshape is reproduced. (Paragraph 32a)
i. The shorter the time constant in a lowpass filter, the more
closely the original waveshape is reproduced. (Paragraph 32a)
j. A differentiator is a circuit whose output voltage is
proportional to the rate of change of the input voltage. (Paragraph
32c)
k. A shorttimeconstant, highpass, series RC or R1 circuit is
known as a differentiator.
l. An integrator is a storage circuit in which the output voltage
is proportional to the total amount of energy stored.
m. A longtimeconstant, lowpass, series RC or RL circuit is
known as an integrator.
36.
REVIEW QUESTIONS.
a. What does the time constant indicate with reference to a pulse
voltage?
b. What is the output waveform from a shorttimeconstant, high
pass, circuit with a rectangular pulse voltage input?
c. How does increasing the time constant of a highpass filter
affect the pulse waveform?
d. What time constant provides the best pulse reproduction in a
lowpass filter?
e. Describe a differentiated waveform.
f. What is the effect of increasing the time constant in a
differentiator circuit?
g. Describe the output of an RC differentiator when a rectangular
waveform is applied.
h. What is an integrating circuit?
i. What is the relative time constant of an integrator circuit?
90
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