Site License allows an unlimited number of users at one (1)
location. Users must be officially affiliated with the site during the time of use.
That means the license does not follow a user who permanently leaves the site (graduation,
new employment, etc.). The license extends to persons whose primary job is normally
performed at that location, but works occasionally from home or at a remote location.
Hobbyists employed at the same location are welcome and encouraged to use the software.
The single location restriction is imposed to limit distribution to local use for
companies with multiple physical locations. This software may not be redistributed
in any form, nor posted on the Internet or anywhere that it can be publicly accessed.
The file(s) may be distributed on a server, via e-mail, etc., as needed.
Assistance: Because the price for RF Cascade Workbook
2018™ is so low, I cannot provide any level of assistance
with setup or operation. After all, you're getting an amazingly feature-filled program
for less than an hour of an engineer's billable time. Reported errors, if any, will
be addressed ASAP.
Macros: You must enable
macros to run or you cannot use RF Cascade Workbook 2018.
System Requirements: Excel 2007 & Windows 2008 or newer.
These instructions and screenshots were made in Excel 2007, so your screen and menu
placements might be a little different. I verified that everything works fine all
the way through Excel 2016.
Help: Here is the complete
Help Page from RF
Cascade Workbook 2018™.
by United States copyright law. Unauthorized copying, alteration, or distribution
of this spreadsheet is prohibited by law. As a lawful owner of a RF Cascade
Workbook 2018™ user license, you are permitted to make modifications for your
unique application; however, this workbook may not be modified and distributed or
sold as a new product.
Disclaimer:RF Cascade Workbook 2018™ is offered AS IS. Your use of RF Cascade
Workbook 2018™ implies you alone accept responsibility for results obtained
through its use, and will hold harmless Kirt Blattenberger, RF Cafe, and all legal
assigns for any losses incurred through its use. RF Cascade Workbook 2018™
has been tested very thoroughly, and there are no known problems at the time of
this release. Discrepancies that affect accurate results, if discovered, will be
fixed ASAP and a replacement version will be provided at no cost. Also, any and
all User modifications to RF Cascade Workbook 2018™ - other than entering
values in the provided Unlocked cells, negates any and all responsibility by RF
Cafe for the integrity of the software. Unprotecting a worksheet negates responsibility
by RF Cafe.
There might be minor differences between the current version
of RF Cascade Workbook 2018™ and what is shown in these screen captures.
20 Chart Types
Block Diagram Icons
Help | Hints
For more than a decade, RF Cascade Workbook 2005™
has been the de facto standard for spreadsheet-based RF system cascade analysis.
RF Cascade Workbook 2018™ is the next phase in the evolution. If you know
how to use Excel and you know anything about cascaded system calculations,
then you know how to use RF Cascade Workbook 2018™(formerly Wireless System Designer™). This is significantly
easier and faster than using the multi-thousand dollar simulators when a quick system
analysis is all that is needed. Hundreds of hours have gone into developing this
tool. Please see RF Cascade Workbook 2018™ intro video
below for an overview of features.
Mouse-over Comments for Cells
Excel's cell comment feature is
use extensively to provide guidance for RF Cascade Workbook 2018™ (RFCW).
The contents of all the hints - and more - can be found on the "Help" worksheet
(click the tab at the bottom). The "Help" worksheet,
cell mouse-over comments, and this web page comprise the totality of documentation
for RF Cascade Workbook 2018™. There is no separate document available.
Cascade Workbook 2005™ User's Guide should also be useful since it
extensively documents formulas. Combined, there is a lot of information about not
just how to use RFCW, but also how cascaded system analysis works. RF Cafe
is also chock full of related information,
so one way or the other, you're covered.
Locked vs. Unlocked Cells and VBA Code
The built-in ability of locking cells
to prevent unintentional overwriting of formulas is used in RF Cascade Workbook
2018™. Most of the time the protection can be left on. Trust me, even after
becoming familiar with use, you will still find yourself accidently attempting to
type into formula cells, and of course doing so invalidates calculated results.
Probably the only time you will need to remove protection is when inserting or deleting
columns or rows. I recommend never Unprotecting any worksheet since doing so invalidates
the integrity as provided. Be sure to reapply Protection if you decide to Unprotect.
See the RFCW Terms of
Use information about liability.
Protecting & Unprotecting the Worksheet
Use Excel's Protect Sheet and Unprotect Sheet commands to lock and unlock,
respectively, the cells. Use the Password provided in the e-mail sent to you with
the file attached. I will be glad to provide it to you again with a proof of purchase.
When Protecting the worksheet, be sure to select ALL the check boxes in order
to ensure that the macros will run (click thumbnail above).
You might need to scroll down in the window to access all the check boxes. See
information on the RFCW "Help" page.
Since the complete worksheet occupies
nearly 900 rows, a convenient drop-down menu is provided to move up and down the
page. Information necessary for the navigation to function is in the cell behind
the menu, so if you accidently overwrite the cells, navigation no longer works
(keep Protection turned on).
Hiding and Unhiding Columns
Rather than deleting and/or adding component
stage columns, it is much simpler to Hide and/or Unhide columns. Doing so retains
all the information without having to go through all the steps needed for deleting
and/or adding columns. All the input and calculated is retained and included in
the overall output, but the Hidden stage columns are not included in the charts.
Hiding component stage columns can be a good way to exclude unneeded plots from
the charts without requiring you to delete/add data series - which is itself a pain
System Cascade Charts
Charts are pre-configured for plotting all
calculated cascade parameters. Auto-scaling of the axes is the default, but you
can change all aspects of the chart formats per Excel standard. Select chart to
display using drop-down menu.
These four top-level overall system
parameters are used for many calculations. Be sure to define them along with the
individual stage component parameters.
Build System Block Diagram
Build your system block diagram using the
provided images or make your own. Click on the "Icons" tab at the bottom of the
page to access and copy the desired icon (58x32 pixels), then paste it into the
block diagram. Use Excel's standard Objects alignment and spacing tools for a perfect
Specify Component Parameters
Enter each stage's nominal and tolerance
values. Error checking is provided for exceeding power or gain limits (see below),
no negative noise figure (NF), making sure NF is equal to absolute value of a negative
gain component, etc. Errors are reported in the "Status" cells. Two rows f user-defined
cells are provided for formulas along with a "User Defined" chart that displays
the cell data.
Set Limits on Gain and Power Input Values
Set maximum values for stage component input
parameters. These values are used for Data Validation in the input parameter cells.
This results in a limit where the charts auto-scale, since entering a null value
of, say +999 dBm for IP3 will render its affect utterly unnoticeable by the
system, the IP3 chart will auto-scale to +1000 dBm or more while the IP3 level
in your actual system might be a maximum of +50 dBm. The useful data would
then be crunched almost entirely at the bottom 5% of the chart. Of course you can
always go in and manually scale the chart axis minimum and maximum values as desired
if you do use +999 dBm as the null value. This just keeps things reasonable
in case you prefer to let the charts auto-scale. Besides, +100 dBm is good
enough in most instances.
Specify Lower and Upper Frequency Sweep Limits for Filter Calculations
Enter the lower and upper frequency range
for calculating the system response inclusive of filters and frequency conversion
stages. 175 equally spaced frequency steps are calculated for all stages. Depending
on your system, you might want to do sweeps across the entire input band of concern,
then do narrower sweeps that will provide finer detail within your smaller filter
Note: the Lower frequency cannot be zero (0) because
of the logarithmic horizontal chart scale. The smallest value
permitted is 10-12, which is small enough to include 1 Hz even when
the Upper frequency is 1 THz.
Every stage can contain a frequency-dependent
component which can be an actual filter or a model of the frequency response of
an amplifier, cable, coupler, etc. RFCW checks to make sure all required inputs
are present and alerts you if they are not. For example, if you select a bandpass
filter and do not enter a lower frequency or if you use a Chebyshev and do not enter
a ripple value (or if you enter invalid values, like lower frequency greater than
Frequency Translation (Mixers | Modulators) Specifications
As with the filter specifications, every
stage can have a frequency translation. That means there is no limit to the number
of frequency conversions your system can have, although from a practical standpoint
you will probably never have more than three. RFCW checks to make sure all required
inputs are present and alerts you if they are not.
Frequency-Dependent Power Levels
Frequency-dependent power levels based on
filter responses and frequency translations are calculated separately from the other
system cascade calculations (NF, IP2, IP3, etc.). Along with the filter response,
all nominal stage component gains are included. Results are plotted in the "Frequency
Response" ("Signal Power vs. Frequency") chart. These frequency-dependent gains
and power levels are not used in any of other cascade calculations (NF,
IP2, IP3, etc.). Note that frequency and power levels presented this matrix are
actually calculated in cells below Row 540, but are done this way to conveniently
place power levels next to their associated frequencies while making data selection
for the chart simpler (take my word for it).
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas
and reference material while performing my work as an RF system and circuit design engineer.
The Internet was still largely an unknown entity at the time and not much was available
in the form of WYSIWYG
All trademarks, copyrights, patents, and other rights of ownership to images and text
used on the RF Cafe website are hereby acknowledged.