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1986-10-27
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AC CIRCUIT ANALYSIS
DESCRIPTION:
AC CIRCUIT ANALYSIS will calculate the frequency response of
an electronic or electrical circuit consisting of resistors,
capacitors, inductors and current sources. The circuit may
consist of up to 50 nodes and 100 components or branches. A
linear or logarithmic frequency sweep with up to 25 intervals
may be selected.
Magnitude and phase are computed for the output voltage
relative to the input voltage. The input is always node # 1
and at a voltage level of 0 DB. The output node number may
be selected when the circuit is analyzed. Node 0 is always
the ground or common reference node. The output node cannot
be 0.
The program will allow you to:
1. Enter or add circuit data.
2. Modify circuit data.
3. Display the entered data.
4. Print the entered data.
5. Load circuit data from disk.
6. Save circuit data to disk.
7. Analyze circuit data.
8. Clear circuit data from the computer memory.
9. Display results (frequency response).
10. Print results (frequency response).
11. Exit to DOS.
If the data is saved to disk before the circuit is analyzed,
only the circuit data will be saved. If the data is saved
after the circuit has been analyzed, the circuit data and the
results (frequency response) will be saved.
The program does not check if the filename already exists on
the disk. A new filename will overwrite a filename with the
same name.
USER INSTRUCTIONS:
The circuit should be drawn and nodes and circuit elements
(branches) should be numbered. Components are identified as
follows:
C Capacitor with value in farads
R Resistor with value in ohms
L Inductor with value in henries
S Current source with value in mhos.
10/26/86
CIRCUIT.DOC Page 1
Scientific notation may be used for circuit values.
Active components such as transistors or operational
amplifiers must be converted to voltage controlled current
sources as follows.
Transistor gm (mhos) = current gain / input impedance
Example: gm = 100/1000 = 0.1
Operational amplifier gm (mhos) =
open loop voltage gain / output impedance
Example: gm = 100,000/100 = 1000
After entering the current source transconductance and the
current source nodes, the control nodes of V control will
have to be entered. This would typically be the base of a
transistor and common or the input to an operational
amplifier and common. Either the "Pos Node" or the "Neg
Node" can be zero. The current source (gm * V control)
leaves the "From Node" and enters the "To Node". Either the
"From Node" or the "To Node" can be zero.
The program is menu driven and fairly simple to use.
W. Rathke
214-255-3808
10/26/86
CIRCUIT.DOC Page 2