New answers tagged

3

Because you have the transfer function with all parts values you can compare this function with the general function - expressed NOT with coefficients (which have no direct relation to the kind of response) but with the pole data wp (pole frequency) and \$Q_p\$ (pole quality factor). It is in particular the Qp value that gives you information on the kind of ...


0

It sounds like you are looking for a transient simulation, instead of the AC frequency sweep simulation that you ran instead. Alternatively, these problems usually specify a single frequency, but you put in a wise range of frequencies. For reference, the three main types of simulation are DC, AC, and TRANsient. DC simulations show DC steady-state ...


4

But I couldn't see sinusoidal waves to calculate phase of voltage(V0) across the capacitor. The AC analysis doesn't give you the time domain response. If you want the time domain response, you should do a transient analysis. But in this case, the AC analysis is actually better. It will give you the phasor of the response across a range of frequencies from a ...


5

Some great answers here already. My sentiment is also that sims have replaced 90% of bench tests for me. Making good sims is a skill however, that one needs to develop. Component datasheets and models are often very good these days. One other thing: Sims also allow me to push the limits of the possible farther because I can explore very tolerance sensitive ...


17

Are their specific benefits to simulating even basic circuits before building them? The bottom line is this; if you simulate the circuit you are trying to design and the simulation doesn't show adequate results then, the chances of it working when you build it are very, very close to zero. So, a simulator tells you quite categorically that something won't ...


7

The second part of the question is "opinion based" and out of scope for this site.. But, simulation is not something meant to replace real world testing. It's another tool in our development toolbox. It has some advantages but also some pitfalls. The simulation is as good as the model you use. One key aspect of simulation is the ability to "...


1

Basically, a digital resistor is a component whose value varies in discrete bumps. An analog resistor is the fundamental component which has a "certain" resistance value and which can vary continuously between two extremes under the influence of a voltage, for example. If no "influence variable" is present, it is a "fixed" ...


1

LTspice from Analog Devices, formerly Linear Technologies. Link: https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html#


0

While on the subject of changing parameters, it might be worth mentioning this method described in the question: How to use .step param with more than two parameters in LTSpiceIV Basically, the .step directive is used with an index variable and the table() function is used to lookup parameter values based on the index. The example from the above question: ....


4

Use the .param command .param C 10u


2

Here there is a file inside the LTspice directory which is called "standard.bjt". Here is a code of 2N2222: .model 2N2222 NPN(IS=1E-14 VAF=100 BF=200 IKF=0.3 XTB=1.5 BR=3 CJC=8E-12 CJE=25E-12 TR=100E-9 TF=400E-12 ITF=1 VTF=2 XTF=3 RB=10 RC=.3 RE=.2 Vceo=30 Icrating=800m mfg=NXP) After modifying your values, then you can paste it with a spice ...


3

It's a Bode plot - one graph is the gain/attenuation and the other is the phase shift.


4

The diode does have an effect on the discharge, as does the saturation voltage of the discharge output with the discharge current and the 1K load. Rather than discharging toward 0V it is discharging towards perhaps 600mV, so discharging to 1/3 Vcc will take longer and the frequency will be lower. That said, I don’t think the NE555 is a very good choice for ...


0

[years later] I am playing around with a circuit much similar to yours, it seems quite prone to self-oscillation when the gate resistance is not set right. This also leads to extended calculation times.


1

The LM1875 is old enough to have a defective sim model made before simulator software was made. I see a couple of errors on your schematic:


2

By attaching the antenna to a AC current source..... and I have plotted V vs Freq. How do i now plot Impedance vs Freq using Circuitlab? So, set the current source to be 1 amp RMS and the resulting plot of voltage is transferrable 1:1 to impedance.


1

How to plot it using Circuitlab, I do not know But I do know how to model it mathematically: $$\underline{\text{Z}}_{\space\text{in}}=\frac{\frac{1}{\text{j}\omega\text{C}}\cdot\left(\text{R}+\text{j}\omega\text{L}\right)}{\frac{1}{\text{j}\omega\text{C}}+\text{R}+\text{j}\omega\text{L}}=\frac{\text{R}+\text{j}\omega\text{L}}{1-\omega^2\text{CL}+\text{R}\...


0

system >Set animation option; and update all the numbers according to the attached figure. system >Set simulation option; and update all the numbers according to the attached figure.


5

You shouldn't really trust the files you find at distributors like Digikey. They are managing data for 100's of 1000's of parts, and sometimes they make mistakes. It's much better to go directly to the manufacturer website if you're looking for simulation models (or datasheets, footprint recommendations, etc.). If you go to the page for this product at ...


0

Below is the the schematic of an op amp square wave oscillator. Does it look familiar? simulate this circuit – Schematic created using CircuitLab That's right, it's your circuit - less the input signal and capacitor. But how is it an oscillator? R1 is connected from the output to the non-inverting input, providing positive feedback. If the output ...


1

If you ignore V1 then you have a classic op-amp/comparator relaxation oscillator circuit that you also find in this SE question: Oscillator circuit with TL071 opAmp for amateur very short range AM radio and these other web pages: https://publicism.info/science/electronics/11.html https://circuitdigest.com/tutorial/relaxation-oscillator-using-op-amp The ...


0

Is Vt given at 33nA? If so then Beff from Ids is correct.


1

If the battery voltage is v(t) and the instantaneous power consumption is p(t), then the current drawn must be p/v.


0

Verilog simulators usually do NOT allow you to load a standard cell library in their .lib for usage. If you used a tool like Cadence Liberate for charecterization of the standard cell library, then you can do write_verilog -specparams -table_style min-avg-max libname.v You need to have the .v file for the library. Once you have this, you can compile them in ...


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