Questions tagged [pspice]

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2answers
63 views

PWM with opamp does not show expected output

I'm trying to get a PWM modulated signal using the next circuit It is supposed the oscillator part changes the voltage from 2.5 V to -2.5 when reaching saturation, I was expecting something like this ...
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2answers
72 views

Need help producing triangular waveforms

I've recently started using pspice and just created my circuit but don't understand how to do step 3 on procedures. I've created my circuit based on the second picture shown below (ignore my 10V). I'...
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0answers
49 views

How do i find poles and zeros from a Bode plot?

I have this Bode plot of CS amplifier but what I need is poles and zeros of the circuit. I am using Pspice for simulation. And the Bode plot is: Now, I calculated the poles theoretically and the ...
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0answers
44 views

PSpice student edition, no VDC?

I downloaded PSpice 9.1 Student Edition from Electronics Lab (basically the first google result for "PSpice Student Edition"). I am trying to follow some basic circuit tutorials and I get the point ...
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2answers
32 views

Pspice modeling of transmission line

I'm trying to model a differential digital signal going through 4000 feet of twisted shielded pair. The nominal impedance is 120 ohms and capacitance per foot is 14.6 pF. For 1000 feet I calculated ...
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0answers
49 views

How to calculate total harmonic distortion in PSpice?

How can I calculate the total harmonic distortion of a sinusoidal Oscillator in Pspice? I am using eldo and ezwave for the simulations and waveforms.
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0answers
30 views

Loop Compensation Design Case Study

I am understanding loop compensation to DC-DC voltage mode buck converter from this case study Compensation Case study For example: I am simulating in PSpice Dominant Pole Compensation (Pg No 8 to ...
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0answers
17 views

uniform, bimodal and skewed distribution functions in pspice

As you probably know, for statistical analysis in pspice there are four distribution functions: uniform, bimodal, skewed and gaussian distribution functions. For typical parts such as resistors and ...
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0answers
57 views

Frequency Compensation Design

I am trying to understand compensation using TPS40200 datasheet, the flow is given in Page 26 to 30 of the document. This sentence is bit is irrelevant in Page 29, because ...
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0answers
26 views

how to pause/stop spice simulation in Altium Designer?

I am trying to simulate a circuit with Altium Designer. My simulation takes very long time, and I need to tweak the circuit frequently. Although I am able to stop/pause on-going simulation in LTSpice ...
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0answers
17 views

(PSPICE Schematic) How to set values for CJC and CJE?

This should be a pretty easy question but I can't seem to find the window where I can directly set values for CJC and CJE. I have to simulate a circuit with those conditions, but I can't find the ...
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2answers
64 views

Overlay plots from PSpice - SIMetrix or SIMetrix to PSpice

I wanted to verify the accuracy of a identical model which I modelled, between PSpice and SIMetrix simulator I ran model in Pspice and SIMetrix separately and probed required nets (net names are ...
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1answer
22 views

Can I edit an incremental resistance of zener diode in PSPICE?

It seems like breakdown voltage and current of zener diode model in PSPICE can be edited like the screenshot I've uploaded(BV, IBV). But I want to change the incremental resistance of diode(Rz). Is ...
1
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1answer
51 views

Diode N value less than 1 for temperature sweep

I have seen many manufactures using diodes N<1 for their PSpice model and LTSpice model diodes so I tried to run temperature sweep in LTSpice and PSpice In LTSpice if N<1 DC sweep eg:1m with ....
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1answer
30 views

NOT valid mode type SIMetrix from Netlist

I am trying to run PSpice netlist in SIMetrix .cir and it says NOT valid mode type SIMetrix from Netlist, do we have to add any command other than this.
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0answers
29 views

Error amplifier in PWM controller

Using the datasheet UC3842 PWM Controller I have modelled error amplifier in it. AC analysis of error amplifier matches with the datasheet plot(Figure 3) - Since I need to clamp the output ...
1
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1answer
65 views

Gate driver using switches UC3842 PWM Controller

I have prepared a crude model of boost controller using PSpice simulator of UC3842 IC Gate driver has Ron and Roff as 1 and 100meg respectively (S3 and S5) and Vout will go to external mosfet or a ...
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1answer
34 views

Can we calculate the total harmonic distortion of an oscillator directly from ezwave?

Can we calculate the total harmonic distortion of an oscillator directly from ezwave? If yes, then please tell how to calculate it. Else what are the approaches to calculate THD of an oscillator.
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29 views

MCP1630 Spice model

Does anyone knows where I can find MCP1630 spice model ? I realy need it to complete my project and microchip does not provide the spice model of this device. On my behalf, I do not master SPICE to ...
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0answers
26 views

OrCad IBIS to PSpice translator creates multiple models for my part

So I used the IBIS translator in PSpice Model Editor for an ADC (AD9343). it produces multiple .subckt models (one for Input, one for Output, one for IO,etc...). Now when im creating a part, it lets ...
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0answers
33 views

Phase noise and spectrum of oscillator in SPICE

How can I plot the phase noise and Frequency spectrum of an Oscillator using SPICE.
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1answer
169 views

Delay implementation in PSpice

1.I have been using oscillator circuit as Parametric delay block with the help of other sub blocks at the output/around. Second method is RC for the delay at the output of any circuit (ABM) or ...
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0answers
18 views

How do I generate an impulse in Pspice? [duplicate]

I want to generate a narrow pulse of very small duration. How can I implement it using PWL function. Or is there any other method for this.
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0answers
37 views

How to implement a switch in spice? [duplicate]

I have designed a circuit where I want to give a pulse of very short duration using a switch. How can I implement it in spice.
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0answers
58 views

Why does the frequency of an oscillator changes with the time duration of .TRAN command?

I have simulated an oscillator circuit using OTA in SPICE. It is a self starting oscillator. However, the frequency of oscillation does not change with the bias current but changes with the duration ...
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0answers
17 views

OrCAD PSpice: How to import an excel dataset of frequencies and their corresponding voltages as a variable source to simulate a noise

I have been trying to simulate a variable voltage source which has different voltages at different frequencies. I have around 15,000 points on excel for the same. I found ...
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1answer
93 views

Circuit thermal analysis in PSPICE and temperature coefficients

I am tying to perform a thermal analysis in pspice. Resistors needs two temperature coefficients as TC1 and TC2 (if we assume linear change of R vs. T, it's zero) in pspice. But in resistor datasheets ...
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2answers
107 views

PSpice simulation of phase-shift oscillator doesn't work

I'm trying to simulate on PSpice a BJT-based phase shift oscillator, like in the following schematic: but when trying to measure the voltage on the node connecting R3 and R5 I only get DC voltage (...
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1answer
38 views

Problem with PSPICE simulation

I am having a problem replicating some lab results in the PSPICE/capture CIS program for an assignment. I have this circuit right here: which is an oscillator using the uA741 op-amp which is supposed ...
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1answer
35 views

Problems with capture cis simulation

I am trying to run some simulations on capture(PSPICE) for a school assignment and then compare the results of them with the results that i got when trying these circuits in the lab. However the ...
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1answer
56 views

PSpice OrCAD simulation

I want to get an impedance vs frequency graph for a capacitor in AC sweep analysis. I saw that there is an 'Impedance(1,2)' as shown in this picture in the Modify Trace window under Plot window ...
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0answers
174 views

Error converting PSPICE model for LT Spice

I'm using LTspice XVII, and I'm having issues generating components from PSPICE component files. Previously, I was able to follow the method of opening the netlist file, highlighting the name, right ...
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1answer
58 views

Pulse frequency modulation mode in buck converter MAX15062

I am modelling MAX15062 DC-DC buck converter using datasheet in PSpice, initially i worked on control loop. This buck converter has two modes PWM and PFM mode. With MODE pin unconnected works on PFM ...
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0answers
108 views

PSpice error: '*$' is not a model parameter name

I am using OrCAD PSpice Student Edition, version 9.0, fairly old version (1999) but its what we have access to. I've had this problem almost every time I use custom parameters for any model, which is ...
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3answers
870 views

LT Spice Voltage Output

I am using LT Spice for simulation of my circuit. I have used a probe to check for the voltage on the Capacitor. What is the green dotted line that can be seen in the plot? Thank you.
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0answers
27 views

PSPICE Error in Second order High-Pass Sallen-Key Filter

As part of a class project, I'm trying to filter pulses with noise by implementing a High-Pass Sallen-Key Filter with the resistors replaced with transconductance amplifiers (schematic shown below). ...
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0answers
35 views

Constant current limit in the SIMPLIS

I wanted to convert this error amplifier form Pspice to SIMPLIS, for now i am using voltage controlled current source (VSCS) with the FB nod to the negative and Vref to the positive node of the device ...
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1answer
56 views

Simulation of a chopper type E (four quadrants) in pspice

Im trying to make a chopper working in the four quadrants based on these idea translated to this circuit But it cant be simulated, psice gives the next log ...
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2answers
839 views

If Manufacturer spice model and Datasheet give different values which should I use?

I'm trying to simulate an LED circuit but I am getting a large difference in results from the simulation vs calculations done using the datasheet information. In this case both the spice model and ...
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1answer
94 views

Orcad Capture CIS, How to change transistor area?

If using the QbreakN and QbreakP, how could I change the relative emitter areas of each individual transistor. I need to match the parameters like in the figure below:
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1answer
61 views

Pspice simulation of NE5234 op-amp internal circuit. Currently getting zero voltage gain

I'm attempting to simulate the NE5234 op-amp via internal circuits. I'm not currently getting any errors, and so the AC sweep simulation does run, but I am getting 0 V on the output nodes. I'd ...
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1answer
151 views

[UPDATED, not solved]Simulating a Buck converter

Im trying to simulate a buck converter done in class to see if this fits what the theory says it would be, It must receive 110 V and send to the load around 60V and 20 A, the circuit is: And with ...
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1answer
382 views

K_linear part description in Pspice

Please someone explains the main parameters used in the k_linear part in pspice , more specifically what is L1 , L2 , L3 and designators in its parameters?
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0answers
468 views

Impedance simulation using Pspice

I am trying to simulate the equivalent circuit of an inductor using pspice 9.1. I need to plot its impedance vs frequency to observe the parasitic behavior. I am new to pspice and I don't know how to ...
1
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1answer
269 views

PSpice AC Circuit Simulation Showing 0 V for Output Voltage?

I am trying to run a simple Op Amp simulation. My lab gives zero instruction on PSpice, tossed us a brief manual on DC PSpice circuits (even though the class is AC), and said go forth. The circuit I ...
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1answer
49 views

How does work the trigger/start of this buck converter?

Im watching this video but since its in german I dont fully understand the way it works, specially the startup side with the pulse source and the mosfet. Could someone explain me this part of the ...
2
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1answer
698 views

PSPICE - must be 'I' or 'V' error

I'm trying to make a super simple circuit simulation for a class, and I keep getting the same error: ERROR -- Must be 'I' or 'V' Here's the whole log: ...
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1answer
104 views

Problem with simulation of a n- mosfet in pspice

Im trying to make a simulation based an a DC sweep from this circuit But at the moment of simulation I receive this warning WARNING: [NET0093] No PSpiceTemplate for M4, ignoring And it does ...
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0answers
88 views

Simulating a specific MOSFET circuit in PSPICE

I want to simulate this circuit in PSPICE (to get approximate output waveform (\$v_o\$)) simulate this circuit – Schematic created using CircuitLab Here, \$v_{in}=0.2 \sin(wt) , \$ & ...
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0answers
32 views

How to calculate or show in matlab/pspice the DC component from a circuit simulation?

Based on Pspice I'm simulating this RL full wave rectifier That gives the next voltage and current output at the showed probe point The idea is to extract the DC component of the current or voltage, ...