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Harmonic balance

Click here to go to our main page on microwave EDA software

New for April 2015! Harmonic balance is a powerful steady-state technique that can be used to analyze linear and non-linear circuits.

In contrast to small signal S-parameter analysis (so-called linear analysis), harmonic balance considers multiple tones, making the assumption that the response can be determined if all of the chosen harmonics satisfy Kirchoff's law. Like electro-magnetic analysis, HB ends up being an approximation that meets an error function that you specify.

With harmonic balance it is possible to model multi-frequency response of receivers and exciters.  It can also be employed to look at the non-linear response of a limiter.

HB can predict the performance of power amplifiers, provided you have an accurate large signal model of the transistor.  That is a big caveat, ask the best power amplifier designers and you might find they hedge their bets using the Cripps method.

Revised Cascade Calculator

Basic Scaler Cascade Analysis Calculator
Enter gain, noise figure, and P1dB to calculate cascaded system performance.
&nbsp Stage 1 Stage 2 Stage 3 Total
Gain (dB) 0
NF(dB) 0
P1dB (dBm) -.4771
 
Total Gain (dB) = Gain1 + Gain2 + Gain3
Total NF (dB) = 10*log10(nf1 + (nf2-1)/gain1 + (nf3-1)/(gain1*gain2))
Total P1dB (dB) = 10*log10((1/(p1dB1*gain2*gain3) + 1/(p1dB2*gain3) + 1/(p1dB3))^-1)
Note: The calculations for Total P1dB and NF
use linear values (NOT dB) for nf, p1dB, and gain.
Need more stages and more system parameters? Try the free Cascade101 Worksheet!
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