# Tag Info

### What does a far-field SPICE model for a 900 MHz antenna look like?

In the far field, the effect of (transfer or self-) impedance, or variation thereof due to relative placement, distance, etc., is minimal. Assuming the antenna is a one-port, you don't get any ...
• 40.4k
Accepted

### How can I simulate an RF signal as received by an antenna in LTspice?

Yes, to all, with the caveat that (4) will take a very long time as transient simulation proceeds incrementally, as discussed in another recent question. And consequently might not be very accurate (...
• 40.4k
Accepted

### I am Seeking Help to Adjust DC Motor Simulation Parameters in LTspice for Accurate Current Modeling

I initially considered deleting my question, but I think sharing an answer based on my experience is more beneficial. Estimating all six parameters required for a close approximation proved very ...
• 63

### Is there a way to include a legend in LTSpice graphs for a sweep variable?

It seems that LTSpice has changed recently, the accepted answer does not work for me. Now you need to Right-click on waveform -> Notes & Annotation -> Annotate Steps and place UI block in ...
• 121
1 vote

### Synchronous FIFO design code review

That's the way you designed it: rd_en goes high on one clock edge, and on the next clock edge, the FIFO sees it and reacts to it by outputting the data. That's just ...
• 175k
1 vote

### Voltage-controlled oscillator problem

What do I miss here? What you miss are the subtle details. The frequency does vary between your two posted plots, but maybe not as much as you anticipated. The first plot (R14=80 ohm, R15=10 ohm) has ...
• 1,446
1 vote

### Voltage-controlled oscillator problem

I set the control voltage with the R14/R15 voltage divider, but for some reason the frequency does not seem to depend on the control voltage. Your simulation does not vary the control voltage, so you ...
• 5,630
1 vote

### Iterative Simulation LTspice Model using Python

You can call ltspice from the command line: XVIIx64.exe -Run -b examplecircuit.asc So you would need to modify the .asc file and then run it. You can also run netlist files which are easier to ...
• 85.3k
1 vote

### How is there a voltage on the secondary coil when di/dt=0 on the primary coil?

I was under the impression that the secondary voltage was equal to mutual inductance times di/dt on the primary coil, yet di/dt=0. This is only true if the there is no current in the secondary coil. ...
• 25.4k

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