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circuit Q, and this application will immediately display the values of all the appropriate matching topologies MixSpur, by the Engineer s Club, is a program that will graphically and in tabular format display the spurious output frequencies, and their amplitude, as emitted from a mixer and local oscillator (LO) stage Use MixSpur to confirm that both in-band and out-of-band mixer-generated spurii are below specifications for receiver and transmitter design; or will more filtering, a new LO frequency, or a different mixer be required Available for sale online RF Workbench, sold by RFCafecom, is a low-cost system design program that will assist the RF designer to define the specifications of a transmitter or receiver chain s amplifiers, filters, and mixer stages, and then view the resultant spectrum in the frequency domain, with bandwidth RF Workbench will not only permit you to see if the system s sum frequency or LO feedthrough will be troublesome, but if any mixer spurs are in or out of band, and what their amplitudes may be It also shows you if any particular stage is going into compression, what the system s gain, P1dB, IP3, POUT, and NF values are, calculates the complete transmitter-to-receiver path, and creates a frequency and cascaded amplitude budget plan A truly invaluable program, the fully operational shareware version is included in this book s CD (If Excel is available, RF Cascade Workbook is another outstanding program available on RFcafecom for systems cascade analysis) A Spice program of some sort will always be required for certain AC/DC timedomain circuit simulation tasks Linear Technology s excellent LTSpice is included in the enclosed CD Also, Beige Bag software s B2 Spice is a well-known and very effective Spice-based simulator with a multitude of powerful features and capabilities Numerous other Spice-based programs can be found on the market today There are additional RF software tools available and in common use among most RF design engineers Such as the expensive, definitive software suites that model almost all linear, nonlinear, and electromagnetic effects of all kinds, such as the first-class Eagleware Genesys by Agilent; the ubiquitous ADS, also by Agilent; and the outstanding Microwave Office, by AWR
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RF Simulator Accuracy and Guidelines
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Many subtle factors can lower or even destroy an RF circuit simulation s real-world accuracy This section will go into many of these issues
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A major impediment to accuracy in RF linear and nonlinear simulators is the inability to easily export the entire circuit layout, as simulated, directly into a PCB layout package (the PCB layout itself is a major part of any RF design above a few 10s of MHz) Indeed, if the final PCB s layout is different from the RF simulator s circuit layout, then the realworld results will differ, sometimes quite drastically We must perform this timeconsuming and difficult duplicate layout task by hand, and as accurately as possible However, a second major limitation, which can drastically affect simulation accuracy as well, is the lack of truly accurate RF passive component models This is because any S-parameter model, which is typically used for all RF simulations, cannot be expected to be completely accurate for every PCB substrate s dielectric constant and board thickness Therefore, if the RF designer selects a board material or thickness that differs from how the S-parameters were taken, then simulation accuracy will suffer, especially as the frequencies increase In other words, all available S-parameter
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Radio Frequency Simulation
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models are highly substrate dependent Also, some of these S-parameter models may have PCB footprint pad effects included, while others may not; which is another substrate dependence that can significantly influence simulation accuracy Further, S-parameter models are not the optimal method to use in RF simulations, since they cannot easily be changed in value during the software tuning of the circuit design itself They also cannot be automatically optimized by the simulator, nor can we perform a Monte-Carlo tolerance evaluation Nevertheless, this significant RF simulator limitation in the lack of adequate RF passive component models for the microwave region has finally been successfully addressed by Modelithics, Inc Modelithics creates passive models that are invaluable for use in all accurate RF simulations above 900 MHz, and which have the full capability to factor-in a component s PCB footprint parasitics, permits full circuit optimizations to be run on each part s value, and (most importantly) the board s substrate thickness and dielectric constant are all automatically factored into the RF simulation The resultant simulation versus real-world results is incomparable, with previously unheard of accuracies over anything ever obtained in the RF/microwave simulation world In today s highly competitive wireless microwave market, Modelithics models are no longer simply an option when designing at high frequencies; they have now become a requirement for highly accurate, first-pass RF design
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