Problem 13.1 - RL High-Pass Filter Circuit and the SIN Waveform
*
* NOTE: There are both frequency-domain and time-domain parts to this
* problem. Consult textbook Section 13.1 for reference material
* on the RL high-pass filter circuit.
*
* 1. Use the .AC sweep command and PROBE to obtain graphs of the
* circuit gain and phase response as a function of frequency.
* Using data from the (printed or) plotted graphs, estimate the
* expected output of the circuit for each of the voltage sources.
*
* 2. Determine the output for two discrete frequencies used as input.
* Using the SIN function and .TRAN analysis for each of the two
* sources separately, obtain PROBE graphs showing the input and
* output waveforms for each case.
* ===> You can use phasor analysis to calculate the circuit current at
* each frequency separately, then use the corresponding time-domain
* expression to calculate the initial current for the inductance.
*
* Problem 13.1, Part 1. Steady-State AC Frequency Response
.OPT NOPAGE NOBIAS ; This circuit file will produce the magnitude
V1 1 0 AC 1 ; and phase curves for the filter response.
R1 1 2 2200
L1 2 0 7m
.AC DEC 10 500 5E6
.PROBE
.END
Problem 13.1, Part 2. RL High-Pass Filter Circuit and the SIN Waveform
*
* Estimate gain and phase of output for a 5-kilohertz input
* signal with 3-volts peak amplitude. Initial conditions must
* be used to eliminate transient effects at t=0. Obtain PROBE
* graphs showing the input and output magnitude and phase.
*
.OPT NOPAGE NOBIAS
V1 1 0 SIN(????????????) ; Enter the SIN function parameters.
R1 1 2 2200
L1 2 0 7m IC=?????????? ; Enter initial condition.
.TRAN 2E-5 ???? 0 ???? UIC ; Complete the .TRAN command. Use a
; TFINAL to display five cycles of
; SIN.
.PROBE V(1) V(2)
.END
Problem 13.1, Part 3. RL High-Pass Filter Circuit and the SIN Waveform
*
* Estimate gain and phase of output for a 500-kilohertz input
* signal with 3-volts peak amplitude. Initial condition must be
* used to eliminate transient effects at t=0. Obtain PROBE
* graphs showing the input and output magnitude and phase.
*
.OPT NOPAGE NOBIAS
V1 1 0 SIN(????????????) ; Enter the SIN function parameters.
R1 1 2 2200
L1 2 0 7m IC=?????????? ; Enter initial condition.
.TRAN 2E-7 ???? 0 ???? UIC ; Complete the .TRAN command. Use a
; TFINAL to display five cycles of
; SIN.
.PROBE V(1) V(2)
.END