CCICAP Information

You can view the CCICAP Manual online, download a gzipped PostScript version of the Manual, or download a zipped file of the HTML version.

CCICAP is a linear Circuit Analysis Program developed by Circuit Concepts, Inc. CCICAP is easy to use yet feature rich. The program performs frequency and time domain analyses of linear circuits and includes the full range of linear circuit elements including:

Resistors, Capacitors, Inductors
Four types of Controlled Sources
Transformers
Bipolar Junction Transistor Models
Field Effect Transistor Models
Ideal Operational Amplifiers
2nd order Operational Amplifier Models

In the frequency domain, CCICAP offers the following features:

Frequency in Hz (default) or radians per second.
Results in dB and phase (default), magnitude and phase, or real and imaginary.
Linear or logarithmic frequency sweeps.
Tabular and plotted results.
Relative and Absolute element and multi-parameter sensitivities.
Circuit Optimization - CCICAP can optimize a circuit response to match a response specified by the user. The reponses optimized include:
- Amplitude Response
- Phase Response
- Delay
Extensive parameterization and calculation of element values and responses.
Element variation sweeps.
Extensive noise analysis features, including:
- Noise density.
- Integrated noise.
- Total noise over a user specified noise bandwidth.
- Exclusive noise table: listing of circuit elements ordered by their noise contributions.

The analysis is specified by the use of a text input file. Input files can be as simple as the following example describing an RC low pass filter.

.title RC Low Pass Filter
' ac analysis, 20 intervals / decade from 1.0 Hz to 10. KHz
.ac 20 10 1. 10.k
' plot the response
.plot ac 80 eout eout >
' define the filter cutoff frequency
.par fo { 10.khz }
.ckt
' define an RC low pass filter
' input source
v ein 1 0 1.
r r1 1 2 1.k
' use fo to calculate the required c
c c1 2 0 { 2 PI X fo X r1 X 1 XY / }
' output voltmeter
vm eout 2 0
.end
.go
.stop

User comments are added following a single quote ('). The analysis is requested by the .ac command. The filter cutoff frequency is defined as the parameter 'fo.' The circuit is described between the .ckt and .end records and uses the parameter 'fo' to calculate the required capacitor value. CCICAP defaults to units of Hz, dB, and phase (degrees) for AC analyses. Much more complicated input files can be used to run the same circuit with altered parameters, to run different circuits from the same input file, to generate raw data for other applications, etc.

A binary version of CCICAP for the Linux operating system is available as a gzipped file. To install, simply decompress and move the file to /usr/local/bin. Be sure to make the file executible with something like:

# chmod 755 ccicap

Source code and library files are released under the GPL and are available here as a gzipped tar file. Extract the tar file using:

# tar -xvzf ccicap-src.tgz

The tar file will create three directories, ./include, ./usr, and ./ccicap, under the directory used to untar the archive. Instructions for compiling the source and installing the library files are included.

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