The Bode Plotter would not accept the oscillator’s own oscillation as the circuit excitation. However, when I tried to use the Bode Plotter on the oscillator circuit itself, there was no response, even though the oscillator was working and delivering signal. The signal source V1 provided the circuit excitation required by the Bode Plotter tool to get that instrument to function. Using a Bode Plotter on the passive component network alone, I saw what I was hoping to see: a sharp peak in the transfer function at the correct frequency-in this case at approximately 1.6MHz. (There's a step-by-step tutorial on how to get input and output impedances here.《MOTIX™ Multi-MOSFET Driver: Best-in-Class Solution for DC Motor Control》📢To control up to eight half-bridges with one packaged deviceįigure 1 An unsuccessful analysis attempt. The output impedance is about \$800 \ \Omega\$. If you run this simulation, you'll get this plot for output impedance: And then we'll plot MAG(V(I1.nA)/I(I1.nA)) to see the output impedance: We'll set this current source to have 0 current at DC so that it's only being used as a small-signal current source, pushing and pulling current from the output node. In this case, by mousing over the plot, you'll find that it's about \$2 \ \text\Omega\$ in the pass band:įor output impedance, we need to modify the circuit slightly, just by adding a test current source connected to the output. Input impedance is easy: we can just take the same circuit above and instead plot the expression MAG(V(V1.nA)/I(V1.nA)), which looks at the small-signal current relative to the small-signal voltage on source V1 and plots their ratio, an impedance.
(If you need to recreate this on your own, there's a step-by-step tutorial on how to draw a circuit and get the voltage gain Bode Plot here.) Input Impedance If you open the circuit above and run the simulation, you'll get the following Bode Plot showing approximately +30 dB of gain in the pass band: Simulate this circuit – Schematic created using CircuitLab I've quickly drawn your circuit and set it up to get the Bode plot of voltage gain, setting up a frequency domain simulation with V1 as the source and DB(MAG(V(out))) and PHDEG(V(out)) as the plot outputs: I don't use Multisim, but it's easy to find an amplifier's voltage gain and input and output impedances with the CircuitLab circuit simulator.
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