Questions tagged [pspice]

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Inductor with center tap - OrCAD [closed]

I am trying to build a circuit in OrCAD, and I have an inductor with tree terminals. which component should I use for it? L=0.02mH
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2 answers
90 views

Water level indicator using transistors

I'm trying to designing a water level indicator using npn transistor(BC548). I tried simulating the circuit on PSpice, but I don't know what to add for the sensor. I want a graph. The circuit will ...
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2 answers
272 views

Help me find the PSPICE error, please!

I am trying to simulate the frequency response of a buck converter with the specific tantalum caps that I will be using on my board. The goal is to evaluate stability (phase margin). The capacitor OEM ...
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Pspice simulations

I have bee trying to use Pspice, however I cannot place any symbol on the schematic page. It gives me this error: Could anyone help please?
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Saving a trace expression in pspice

(Using the latest pspice) I have a trace expression: Bode Plot dB - separate( (V(out) ) / (V(in) ) )) And I want to save it since I always use the same one. But I couldn't find documentation ...
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Changing cursor's trace

I've attached an image; I'm using the latest Orcad capture, and I want to change the trace on which my cursor moves and I don't know how to do that, I've seen no documentation online. Help would be ...
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59 views

Why is the base current of a BJT in PSpice higher than expected?

I have made a common emitter amplifier in PSpice with an NPN transistor. I have set the Beta value to 200 in the model settings, however, as you can see from the picture, the collector current is not ...
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2 votes
1 answer
52 views

Changing Vbe_on in Pspice - Student capture

I want to change the V_BE_on in my BJT model but I couldn't find any explanation on how to achieve this. I need VBE on of 0.7[V] and the default I think is 0.8[V] I tried editing the .model -- ...
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2 votes
2 answers
126 views

PID controller design (in pspice) and component values

I am currently building a PID controller and now I would like to know: What is the equivalent resistance of R15, R16, R11 in order to be able to set the resistance of the adder (R6, U5) quite ...
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1 vote
1 answer
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Are the output voltages of each station correct? | Overflow error message when I add feedback

I'm building a PID controller with PSpice For TI2020 and using operational amplifiers. There is a VPWL_FILE that outputs 0V for the first second, then 2V thereafter....
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1 answer
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Why is there an overflow? | PSpice For TI2020 | PID controller (unfinished)

the problem I have another problem with PSpice for TI2020. I want to build a PID controller using operational amplifiers. Up to the red line drawn, the circuit works as it should. However, if I add ...
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Using Orcad To Simulate Pulsed Power System - Transformer Troubles

I am trying to recreate the system outlined in this paper: https://aip.scitation.org/doi/pdf/10.1063/1.1304873?casa_token=VSJdrwapVs8AAAAA:lydmRhcdbQcWRvhPyWSEzZHM7YHmAxcwvh1tr6elGc0jq-...
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1 answer
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Spice pulsing sine source

I've been trying to create a voltage source in Pspice with a 'pulsing' sine wave. I can't seem to get it working, I've tried inputting a sin function in a VPWL source. An example of a waveform I try ...
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2 votes
1 answer
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How can get my LM2776 simulation in KiCAD working

I'm a beginner to both KiCAD and PCB design. I'm using KiCAD 6.0 on a mac. I'm trying to learn simulation and although the simulation basics seem straightforward enough, I have trouble importing ...
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1 vote
1 answer
59 views

Diode-clamped five-level inverter simulation with PSpice

I am working on a diode-clamped five-level inverter simulation with PSpice, but I am unable to get the right results. I have done a simulation with Simulink and I can get the correct result which ...
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-1 votes
2 answers
94 views

Calculate closed loop gain of an op-amp using "pspice"

How do we calculate the closed loop gain of an op-amp using Pspice? Using DC/ AC simulation? We know that the closed loop gain of this amplifier is -Rf/ Ri.
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1 answer
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orcad pspice simulation

I am trying to simulate this OrCAD PSpice simulation based on TLD5045EJ (led driver IC) which I have downloaded from Infineon website. They already provided a test setup file for simulation, I have ...
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4 answers
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PSpice and calculations don't add up for an active band pass filter

I designed a basic active band pass filter and used these equations to come up with a center frequency of 29.9 kHz: $$f_0 = \frac{1}{2\pi\sqrt{(R_1||R_2)*R_2*R_3*C_1*C_2}}$$ In PSpice, it looks like ...
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Common collector

I've created the following circuit in PSpice: I was asked to simulate the circuit and create its Bode plot. I have done that and ended up with this : I suspect that what I've got is incorrect ...
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1 answer
66 views

I'm looking for a component / circuit that distinguishes between eight states

I use PSpice For TI2020, so I don't have a pre-assembled ring counter in the library. I'm looking for a way of setting a specific output to High from eight states that come from 3 flip-flops (up ...
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1 vote
1 answer
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Flipflop's output voltages are 0V

I'm building a 4-bit asynchronous up counter with D flip-flops. Unfortunately the 4 output voltages are always 0V. Can someone please tell me why? I had already placed a digital source in front of the ...
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1 answer
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Understanding questions about MOSFET’s drain and gate series resistor

I build a temperature circuit in PSpice with a TLV3701, a MOSFET and 3 light bulbs (\$R_6\$, \$R_7\$, \$R_8\$). The \$R_9\$ resistor is 108.18 Ω (can be bought, I checked). As soon as the room ...
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1 vote
1 answer
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How to choose correct resistor values for Colpitts Oscillator

I am having a hard time understanding how to pick resistor values to get the circuit to run. I think I have the basic design down correctly but feel like my resistor values are wrong. I calculated \$...
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2 answers
134 views

Alarm circuit should be improved

I built an alarm circuit. The plan If a physical (door) contact (glued to the door) is interrupted (was disconnected by opening the door), an alarm should be signaled after 2 seconds. This is done via ...
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4 votes
3 answers
257 views

A couple of questions about a 555 in astable mode and a blinking LED

I would like to ask you guys to comment a bit. Does it work in real life? I would like to use a 555 in astable mode with the same time intervals for on and off (both 1s) and let a Vishay diode flash. ...
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1 vote
2 answers
109 views

Constant failure in bandpass filter simulation

some of you probably remember my last question, but I like to reiterate: I created a bandpass filter with the help of the online tool FilterWizard, which should block below 30 kHz and above 300 kHz; ...
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1 answer
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What are these extra provided subckt models?

At the continues of UCC28C43 subckt model that I’ve downloaded, the following other subckt models are also available. According to explanations, it seems that, they are for simulating the entire ...
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How to import a subckt model into LTspice while it contains other subckt models itself?

The following spice model refers to UCC28C43. The main subckt models (UCC28C43_STEADY and UCC28C43_START) contain other subckt models which are written in the continuation of the txt file. Is it ...
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Transient steady-state & transient start-up models of UCC28C43

I've downloaded the following Pspice model of UCC28C43. It contains several subckt models. Why are there two different models (transient steady-state & transient start-up) for the IC (...
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1 answer
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FET Simulation DC Gate Voltage Different for VDC and VPULSE

While simulating a basic common source JFET amp I found that eliminating the input capacitor improved the gain of the circuit dramatically. This is because without the input capacitor, the gate ...
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-1 votes
1 answer
62 views

Integrating Spice within larger system model

Is there a way to integrate spice within a broader system model that allows for programming? In particular I am interested in simulating a digital feedback controller whos next output depends upon the ...
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1 vote
1 answer
67 views

Why am I getting an "invalid expression" for output voltage and not for other voltages?

I have designed this monostable (one-shot) vibrator using the 555 timer, yet I am getting this type of error on Pspice for the output voltage only. Where have I gone wrong?
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2 votes
0 answers
152 views

Why are there two different .subckt for an IC model I've downloaded?

I've downloaded a .lib file containing the .subckt model of L6562A. It contains two different .subckt as follows: One of them has an "av" suffix. Is it an average model or something? How ...
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0 answers
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Getting to a battery in PSpice for ti2021.1

I have a brief request that I can't find anything for on Google: Is there a way to create a rechargeable battery in PSpice for TI 2021.1? The battery should be similar to a car battery (14.4 V – 12.8 ...
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-1 votes
1 answer
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How to set loading(resistance) when i try to simulation Darlington pair limit current between Voltage 9 to 36

How do I set my loading (R13) value for simulating Darlington limit current between 9 to 36 V? If there is no loading (R13), the result of Q1 current (C to E) would not show correctly, but a placing ...
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1 vote
1 answer
103 views

555 timer monostable → simulation is not working

I would like to build a simple circuit with a 555 timer, in monostable mode (monoflop). I looked at these two diagrams for this purpose. http://www.learningaboutelectronics.com/Articles/555-timer-...
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1 answer
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Why does a PSpice simulation result in a diode voltage drop of value 0.732V?

I simulated a resistor-diode circuit while inserting the required parameters to compute the necessary voltages and currents across the elements of the circuit From a theoretical perspective, a real ...
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3 answers
78 views

.FOUR command doesn't give the required output

This netlist for a full wave rectifier was actually written for PSPICE. When I type the same netlist in LTSpiceXVII, the log file doesn't show the proper output. I have replaced ...
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1 vote
1 answer
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The circuit was designed to have a -10 gain, but in the PSpice is -5. Why is this happening?

I'm doing a project where I need to design an amplifier (shown below) with a BSS100 transistor: With the following characteristics: \$ Av \$ gain = -10 \$Vcc = 5V \$ \$ Rin > 500 \Omega \$ \$ R1 + ...
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4 answers
138 views

How to design this circuit in a simulator? What is wrong? (PSpice)

I am trying to implement this circuit in the PSpice simulator: I did it like this: I am getting this result: I was expecting something different than 0 in the output voltage. Could someone explain ...
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0 votes
1 answer
117 views

Double pulse test time interval [closed]

Keeping all other parameters (like DC bus voltage, Bus capacitance, Inductor value, etc.) fixed, and only changing the time interval between the two pulses, why would there be a difference in the peak ...
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2 votes
1 answer
197 views

What is the correct approach to simulate a predesigned circuit?

I want to simulate the following circuit with LTspice, but all the operating parts in the circuit (highlights) are not available in the library. I also couldn't find their spice models on the internet....
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1 answer
150 views

Is it possible to import CAD model files into LTspice?

There are very beneficial and comprehensive collections of CAD models provided by Mouser or other websites. Is it possible to use them in LTspice?
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1 answer
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Why I haven't 0V when I put 5V in my cmos

When I Have 5v in my cmos, usually my NMOS have to be close and 0V, however there is a residual tension, I use MbreakN3 NMOS in PSPICE. I don't think this is rd resistance because youtube tuto use it ...
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1 answer
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Pspice for TI: inverter

I'm new on Pspice for TI and I'd like to know why is this very simple inverter not working? Any advice? The simulation seems saturated it doesn't display the PWM signal on the gate.
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1 answer
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How do I connect to a 74LS47 decoder in ORCAD capture cis?

As the question says, I have been trying to connect inputs to a 7447 (7-segment decoder) but I get unknown segments in the pspice simulation, I am using capture CIS and I cannot figure out how to ...
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1 vote
1 answer
95 views

PSpice voltage controlled switch not switching

I am attempting to implement a simple voltage-controlled switch in a larger circuit design in PSpice. I am a student and have not yet worked with this component in the OrCAD suite. The switch is ...
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Conversion of HSPICE-model to PSPICE

I'm new to this forum. I'm writing on my master thesis about a ISFET-curcuit-design. I found a good model for the ISFET from HSpice ("pH-ISFET-CodeNachMartinoia(1999).txt"), but I need it in ...
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0 votes
2 answers
113 views

TI Webench and PSpice Conflicting Results for LM3150 Buck Converter

I am currently in the process of designing a 24V to 5V buck converter using the TI LM3150 buck converter (datasheet). I designed the buck converter to meet the following operating parameters: Vin = 6-...
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2 answers
59 views

About simulating an ac circuit in Pspice

Firstly, It's not homework. I already know the answer. But I couldn't see sinusoidal waves to calculate phase of voltage(V0) across the capacitor. Response of capacitor is look like damping. However, ...
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