Problem 13.5 - The Series RLC Circuit as a Bandpass Filter
*
* When the resistance is used as the load in a series RLC circuit,
* the maximum response of the load voltage is equal to the source
* voltage. The peak or maximum in the frequency response occurs at
* the frequency at which the inductive and capacitive reactances are
* equal in magnitude and opposite in phase so that the sum of the
* reactances is zero (also known as the series resonant frequency,
* or the frequency of maximum response for the resistance).
*
* Use a steady-state sinusoidal ac source voltage. Sweep the frequency
* from 100 Hz to 1 MHz. Use the variable resistance model of Problems
* 13.3 and 13.4. Use PROBE to display on one graph the load voltage
* for all four frequency sweeps.
*
* Follow the instructions of the problem statement to determine the
* RLC circuit "bandwidth" as a function of the damping ratio (or Q).
*
.OPT NOPAGE NOBIAS
V1 1 0 AC 1
L1 1 2 15.916M
C1 2 3 15.916N
R1 3 0 RVAR 1
.MODEL RVAR RES(R=250)
.STEP OCT RES RVAR(R) ; Complete the .STEP command in the
; same manner as for Problems 13.3
; and 13.4. That is, use resistance
; values of 250, 500, 1000, and 2000.
.AC DEC ; Complete the .AC sweep command. Use
; a minimum of 30 points per decade.
.PROBE
.END