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- AC CIRCUIT ANALYSIS
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- DESCRIPTION:
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- 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.
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- 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.
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- The program will allow you to:
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- 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.
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- 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.
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- The program does not check if the filename already exists on
- the disk. A new filename will overwrite a filename with the
- same name.
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- USER INSTRUCTIONS:
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- The circuit should be drawn and nodes and circuit elements
- (branches) should be numbered. Components are identified as
- follows:
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- 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.
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- 10/26/86
- CIRCUIT.DOC Page 1
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- Scientific notation may be used for circuit values.
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- Active components such as transistors or operational
- amplifiers must be converted to voltage controlled current
- sources as follows.
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- Transistor gm (mhos) = current gain / input impedance
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- Example: gm = 100/1000 = 0.1
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- Operational amplifier gm (mhos) =
- open loop voltage gain / output impedance
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- Example: gm = 100,000/100 = 1000
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- 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.
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- The program is menu driven and fairly simple to use.
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- W. Rathke
- 214-255-3808
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- 10/26/86
- CIRCUIT.DOC Page 2
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