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README.RFC
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1994-04-06
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** RELEASE 1.5 **
THE RFC PROGRAM.
RFC is an impedance calculator dedicated to Radio Frequency design engineers
and students.
Using the program you can synthetize and analyze an electric matching network
composed of impedances, inductors, capacitors, transmission lines and
ideal transformers.
The goal of the program is to match impedances; the number of elements of the
electric network must be less than nine.
Each element of the network has one or two variable parameters. You can tune
the parameters by keyboard and the resulting graph is dynamically updated on
the screen.
The screen shows the coefficient of reflection plane in its complex form.
Bilinear transformations of the coefficient of reflection plane, the well
known Smith (R) Charts can be superimposed for presentation purposes and design aid.
The program uses exact formulas obtained from Maxwell equations and circuit
theory.
The graph associated to each element is obtained by sweeping a parameter from
zero to its nominal value.
The RFC keyboard is "a sea of trimmers" enabling fast optimizations by a
highly interactive user interface.
WARNING: the program is "case sensitive".
The program is also capable of frequency analysis and plots, MonteCarlo
simulations, schematic synthesis, etc. It comes with a nice calculator
for complex numbers and an on line help.
I suggest that the hardware should be a 386 PC; the math coprocessor is
useful and recommended. The video interface must be an EGA or a VGA .
The program has been carefully tested and appears to be defect free, but
there is NO WARRANTY about its fitness to applications.
The user is the sole responsible of the use of this program.
THIS PROGRAM IS FREEWARE FOR NON PROFIT APPLICATIONS:
you are not allowed to sell the program, you are allowed to distribute
the program complete with all the files and this README file without any
charge except the cost of the media.
Future developments depend on your feedback.
COPYRIGHT NOTICE.
******************************************************************************
"Smith" is a registered trademark of Analog Instruments Company, New Providence,
NJ 07974.
The charting program is derived in part from the text ELECTRONIC
APPLICATIONS OF THE SMITH CHART by P. H. Smith.
This derivation is by permission of the copyright holder Analog Instrument
Company, but does not extend to commercial production of Smith (R) charts which
can be generated by use of the program. For manual (noncomputerized) use,
Smith (R) charts and accessories are obtainable from Analog Instruments Company,
P.O. Box 808, New Providence, NJ 07974.
******************************************************************************
It is also forbidden to rename this program or the compressed archieve with
the name "Smith".
Commercial applications of this program must contain an agreement with the
author.
HISTORY:
REL 1.1 DEC. 1989
First release of RFC. It has been made availble to the public on 1992.
REL 1.2 APR. 1993
This release is the answer to some public requests.
RELEASE 1.2 ADDS:
A) DEBUGGED FEATURES:
1) You can enter admittance 0+j0 at start point (key <I>) without errors.
2) You can enter impedance 0+j0 at start point (Key <I>) without errors.
3) Info. display now prints R+jX (impedance) and G+jB (admittance).
B) IMPROVEMENTS:
Now you have stubs.
When you enter a transmission line (element T) you can choose
among 5 options. Simply try.
REL 1.3 AUG. 1993
I have again some time to spend for RFC .
RELEASE 1.3 ADDS:
A) DEBUGGED FEATURES:
One bug removed from the file_save function.
B) IMPROVEMENTS:
1) The coefficient of reflection can be printed in dB (return loss).
2) You can recall some constant Q circles using <F4> (help moves to <?>).
3) A simple autotuning routine has been implemented ( <#> ).
Autotuning tunes the first parameter of each class of components:
capacitance (capacitor)
inductance (inductors)
resistance (impedances)
lenght (transmission lines)
turn ratio (transformers)
You can lock an element using the key </>.
If the number of unlocked elements is <=2 then the value of |coeff. of refl.|
is minimized.
if the number of unlocked elements is >2 then the algorithm minimizes the Q
of the network too, but the convergence is not assured because of the nature
of the objective function. If your problem does not converge, please leave
only two elements unlocked.
Autotuning depends on <F7> for its search step.
Remember that Autotuning is never a good solution to your problem.
First use your experience, then use Autotuning.
Autotuning works with a fixed number of iterations, you may run it more than
once.
Example:
Load network 100 (using <ctrl-r>)
Press <F4>
Set fo=50 MHz (using <F5>)
Start Autotuning (using <#>) more than once.
Eventually use <F7> to reduce the search step.
RELEASE 1.4 FEB. 1994 (not distributed)
IMPROVEMENTS:
1) Autotuning has been modified in order to converge to an arbitrary impedance.
Before using autotuning, please move the cursor with the arrow keys to the
desired impedance, then press <#> .
2) Ideal transformers have been added.
The ideal transformer is defined by its turn ratio N.
A real transformer can be simulated by an ideal transformer and two or three
inductors connected to the ideal transformer.
Please refer to literature or examples.
3) Palette control has been added.
4) A USER MANUAL has been added to the program.
RELEASE 1.5 APR. 1994
NO IMPROVEMENT.
You can reach the author by sending a mail to:
fontana@itnvax.science.unitn.it (internet).
Computer site: Universita' di TRENTO, Dipartimento di Fisica 38050 POVO (TN)
Italy.
Home address: FONTANA Giorgio, Via alla Formigheta, 50 38040 Martignano (TN)
Italy.
Giorgio FONTANA