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Thank you for your reply and the test file, Andy. Indeed, splitting v(out) into v(out)@1 and v(out)@2 clearly revealed the missing part at the end, and so the crazy fft plot makes perfect sense.

"In that case I would suggest capturing waveforms on a transistor driving a dummy load, and matching them by modifying Rb for a model that is known to already have correct high-frequency behavior. One

In that case I would suggest capturing waveforms on a transistor driving a dummy load, and matching them by modifying Rb for a model that is known to already have correct high-frequency behavior. One

It’s a somewhat obscure figure of merit in statistical analysis. An R^2 of 1.00 is as near perfect fit as possible, of a formula to a set of data. Anything close to that, is “close enough!” Dave

Hi Jerry, I am investigating a NMOSFET based class E oscillator. The BJT will be used as a driver for the mosfet and part of the feedback loop will include the rbb and the cap_be of the BJT in series

Thank you keantoken. I am interested in the Rbb at high current values. Would the s-parameters help for this estimation? If if does, then please provide some guidelines on how to do so. I am already

IIRC, we've been told that v24.1.3? restores LTspice's ability to generate the netlist, but the netlist it generates is no longer usable as the input to new simulations Stupid.? Er, Bummer.? No, it

Do you want to experiment with this in relation with noise voltage? You could probably build a theoretical model circuit of your transistor and adjust an explicit Rbb' until you have coincidence

I meant to say the fall in transconductance as frequency increases.

For a BJT model, the parameters Rb, Rbm and Irb determine the base spreading resistance. The resistance is Rb at low currents and falls to the value of Rbm as current increases past the value of Irb.

I think it's a question that's no often asked: people just accept it as a magic number. I did a web search, which led to a URL about half a km long, so I can't post it. Instead, do a web search for

I haven't yet tried other than 24.1.0, but View > SPICE Netlist > Right-click > Edit as Independent Netlist > Save, is still available from the Schematic menu. I hope that feature remains, otherwise

Sorry, what does R^2 accuracy measure of 0.9993 actually mean ? Thanks.

Hello friends, Is there a way of estimating the base spreading resistance of a bipolar transistor by using LTspice? Perhaps via getting the transistor's S-parameters? Many thanks in advance!

FYI - My advice about adding GMIN across current sources, is that you should specifically add them to your current sources, by adding a resistor in parallel with them. The checkbox in the Control

Keep in mind, this question was asked nearly a year ago.? This conversation ran out months ago and I don't know if the OP is still looking for answers. If I remember correctly, that person was

No, they are not the same. ".options gmin=<value>" sets GMIN to a number.? GMIN is used in a number of places in SPICE/LTspice, including in parallel with EVERY semiconductor junction.? GMIN is used

I have never been mistaken for an analog designer but if your application demands bandwidth, would considering a current feedback amplifier as the basis of your transimpedance amp be a

Thank you Andy. Do you think .options gmin=<value> is actually the same as "Add GMIN across current sources" checkbox? In other words, does .options gmin=<value> add a <value> Siemens conductance in

john23, Apparently, LTspice incorrectly processes the AD797 model file.? I don't understand why it did that, but here is how to fix it. Change from this: to this: By the way, you uploaded the wrong