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Analog Devices' ADISimRF v1.7 Released
|Analog Devices just announced the release of the latest version
of their ADISimRF applet for calculating cascaded RF component parameters. It takes typical input
values for up to 15 stages and returns typical cascaded values at the output. As I do with any
such program, I compared its results with those of my
RF Cascade Workbook
(RFCW) spreadsheet. The numbers agree as expected since both use pretty much the same set of
well-established textbook formulas.
One difference in the two programs is that
appears to use the standard IP3 (3rd-order intercept point) cascade formula for calculating
P1dB (1 dB compression point)*, whereas
RFCW uses Psat
(saturated power) instead since the P1dB formula is only an approximation of widely varying
nonlinear response and might lead to a false sense of security. RFCW's Psat calculated values
simply test what the output power level for a device would be if the gain were always linear,
and sets a warning flag if it exceeds the specified Psat value. Doing so always errs on the
side of caution. As long as the user is aware of the method used, he can proceed with confidence
with either option.
If you don't like using a spreadsheet and only need the information
hard-coded into the application, then ADISimRF is a good choice, but honestly, the flexibility
of a spreadsheet is probably worth reconsidering your preferences.
* I could not find anywhere that the ADI folks stipulate how
P1dB is calculated, but entering the device P1dB values into the IP3 fields results in the exact
same output value. Here is a write-up I did on
approximating cascaded P1dB with the IP3 formula
and why it is not always valid.
ADISimRF v1.7 Example Screen
RF Cascade Workbook 2005 Example Screen
Here is the full text of the press release:
Feb. 25, 2013 13:00 UTC
New Version of Analog Devices' Simulation Tool Significantly Eases Development of RF
NORWOOD, Mass.--(BUSINESS WIRE)-- Analog Devices, Inc. (ADI) today
announced the release of a new version of its popular
ADIsimRF™ design tool. The free
design tool is the software accompaniment to ADI's complete portfolio of RF-to-digital functional
blocks, allowing engineers to model RF signal chains using devices from across ADI's RF IC and
data converter portfolio. ADIsimRF
Version 1.7 adds a number of new device models along with enhanced support for inter-stage
mismatch calculations. The design tool provides calculations for the most important parameters
within an RF signal chain, including cascaded gain, noise figure, IP3, P1dB, and total power
consumption. The ADIsimRF design tool contains embedded data from many of ADI's RF ICs and data
converters, which designers can easily access using pull-down menus to assist in component selection.
Download ADIsimRF design tool:
View video demonstration of ADIsimRF:
broad portfolio of RF ICs: http://www.analog.com/rf
View ADI's leading portfolio of data converters: http://www.analog.com/converters
ADI's RF design tools: http://www.analog.com/rftools
Version 1.7 Key Features:
The new version of the ADIsimRF design tool includes
significant enhancements to inter-stage mismatch calculations. One of the tool's unique capabilities
as an RF signal chain calculator is its ability to calculate scalar mismatch loss that
results when two adjacent devices have different output and input impedances. In ADIsimRF Version
1.7, device models for many non-50 Ohm devices such as I/Q Demodulators, VGAs and ADC Drivers
have been tweaked in order to take full advantage of the tool's ability to factor the effect
of inter-stage mismatch into cascaded IP3, P1dB, gain and noise figure calculations. The new
version also adds device models for ADI's latest RF ICs, including the ADRF6755 I/Q Modulator
and the ADL5324, ADL5321 and ADL5320 Driver Amplifiers.
About Analog Devices
Innovation, performance, and excellence are the cultural pillars on which Analog Devices
has built one of the longest standing, highest growth companies within the technology sector.
Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology,
Analog Devices serves over 60,000 customers, representing virtually all types of electronic
equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing
facilities throughout the world. Analog Devices is included in the S&P 500 Index.
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