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Re: the upside-down N-channel MOSFETs - It should also be noted that many MOSFETs are symmetrical, where Source and Drain are electrically interchangeable. Even when that is true, I think it would be

I think you are missing the crystal.? Where is the crystal? Is this really a crystal oscillator?? Or is it a relaxation oscillator without a crystal? What determines the oscillator's frequency? Andy

I think that is unlikely.? It is a schematic drawing issue, not a model one.? MOSFETs are normally used where the N-channel current flow is into the Drain pin, through the channel, and out the

@Andy See both /g/LTspice/photo/302220/3911539?p=Created%2C%2C%2C20%2C2%2C0%2C0 and /g/LTspice/photo/302220/3911538?p=Created%2C%2C%2C20%2C2%2C0%2C0 Please correct me

@Tony The upside-down issue is due to how mosfet_018.lib had been defined, please note that both PM and NM from this lib file had been verified previously. See also

You can change to a logarithmic axis (in LTspice) even if the waveform has negative values.? It just won't plot over those ranges.? Best to add a limiting function first (in the waveform window).

Don't worry, it doesn't matter. An expression like VTHRESH & V(B) is evaluated as if it had been written as (aa + bb) & V(B) Best Regards, Mathias

The above illustrates why '{{' instead of '{' could matter, e.g. when the source file also defines " .param VTRESH = aa + bb ". In that case it matters (because of precedence rules) whether VTRESH is

... and I don't read ahead and see the question has already been answered.? DOH!

The plot window will give you the chance to scale the axes logarithmically.? Be careful that your results don't include negative or zero values, which will prevent you from selecting log scaling.?

Umm, your simulation is a .DC sweep.? .DC sweeps can't oscillate. Where is the crystal?? Nothing stands out as being the crystal.? If it is there, I apologize.? Please help us by pointing it out.

There are variety of problems that need fixing first, most importantly: all your N channel? devices are upside-down. I don't actually see a crystal in your schematic, but that's secondary. My advice

Oscillators, especially high-Q ones, often need 'help'.? An XTAL oscillator (in real life) gets a jolt from turning on the power, followed by millions of cycles to eventually ramp up. Simulations

Here is an initial circuit draft of a crystal oscillator : ck_osc.zip ( /g/LTspice/files/Temp/ck_osc.zip ) I have so far checked the circuit operating points according to the circuit

In versions prior to 24.1, parameter substitutions almost worked like C-macros. This elicited creative use cases like dynamic nodes, stepping models etc. It also caused hard to fix bugs, in particular

Although I am happy to hear that, I would be real careful about making changes like that.? On face value, this seems like it is a great thing.? But things are rarely as simple as they seem. Are you

Yes, it is. However, curly braces are perfectly fine in any expression and putting them in a .meas is therefore not incorrect. At least not anymore.

It's best to report that in Analog Devices's Engineer Zone, the official place to report bugs. Andy

The .savestate directive? was introduced in version 24.1.0. I have existing files that worked with this directive. Now, when I try to run any transient simulation I get this error "argument not

You can always create an auxiliary behavioral voltage/current source with the desired expression and get the FFT of that output.