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Can be done easily with a behavioral current source. The equation can be defined by: I = V(Vi,Vo)/R Where Vi and Vo are the voltages across the current source. Example netlist with a sweep: B1 Vi Vo I

Yeah. LTspice is clever about that. The parser must (silently) perform a number of iterations to determine the required evaluation precedence. I don't know whether that's generic in SPICE - I suspect

Bingo! Thanks, Tony! I ended up with: .meas T1 TRIG V(N0)=2.25 TD=3u RISE=1 TARG V(Nx)=Vtarg TD=3u RISE=1 .meas VNx MAX V(Nx) FROM {5*Pw} TO {25*Pw} .meas Vtarg param 0.9*VNx Which returns the same as

Try: .meas VNx MAX V(Nx) FROM {5*Pw} TO {25*Pw} .meas Vtarg param 0.9*VNx .meas T1 TRIG V(N0)=2.25 RISE=1 TARG V(Nx)=*_Vtarg_* TD=3u RISE=1 ..instead. (You also had 2x TD=3u in the constraints, but I

Yeah, with or without parens, it Fails. Nice feature when editing a ,MEAS (after a Run), there’s a Test button that executes the measurements on the last data set. Click. Fails! Edit. Click. Data

For AC simulation use VOLTAGE-source connected with E-source with string LAPLACE=(1+T3*S)*(1+T5*S)/((1+T4*S)*(1+T6*S)*SCALE_1KHz) in Value field Place.param T3=3180uS T4=318uS T5=75uS T6=0uS

I'm no expert in this area, but expressions within { } are evaluated before simulation, which is not what you want, of course. What if you use ordinary ( ) instead?

I'm frustrated by failure of a time measurement I'm trying to make. My circuit generates a pulse train with parameterized width, Pw. I want to measure a delay, from a rising edge of one node, N0, to

Carlos, Walter Jung had developed a SPICE file many years ago that uses the LAPLACE function in SPICE to define the precise time constants.? You run your RIAA circuit through his inverse RIAA

Using a pulse or square wave ("SW" in the original message in this thread) can tell you things about the transient behavior, that a small-signal linear frequency sweep might not tell you. Andy

Dear all, I am trying to simulate a circuit with negative conductance using transistors and passive components. Does anyone have a circuit for this? Best regards. Sebastian

I would use an AC analysis. Produces a nice plot of frequency response that you can compare to the RIAA curve. That is what I did when I looked at the Carver C1 preamp stage. --

It doesn't seem right to use a pulse signal for an audio application. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

If this is for testing a preamp, it might also depend on whether the preamp has filtering for beyond-audio frequencies, including RFI. Andy

For a 100 Hz square wave, set Tperiod = 10m.? Do you have a calculator?? 1/100 = 0.01 = 10e-3. Then set Ton = Tperiod - (Trise+Tfall)/2. That square wave would generate harmonics extending well past

Not sure what you hope to learn from 20kHz square wave testing of an RIAA preamp, but it would depend on whether the 75μs pole is implemented passively, or in the main feedback loop. Are you testing

I want to know if my Pulse settings are correct. Correct point in not using 20KHz, but something more in the listening range. Like 100Hz to 15KHz Carlos <AI.egrps+io@...> wrote:

Also, I wonder why someone would use a 20 kHz square wave, with anything related to RIAA.? Would you not be better off using a lower frequency, something within the audio band? Andy

Un, what are you asking?? What is an "RIAA square wave"? What is your PULSE waveform intended for?? That should lead you in the direction of answering your own question. We can not read your mind.?

Hi, This should be the first time I will be using a SW to test a RIAA preamp response. I was thinking of copying the settings I use for testing power amps, but I am not sure it's correct. They are: