Questions tagged [pspice]

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1answer
20 views

capture cis transient convergence problem

I have this schematics and I want op amp to saturate but I am not able to finish simulation due to convergence error. I have tried add 1 ohm resistance,1p capacitance to circuit, reduce ABSTOL to 10uA,...
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1answer
50 views

designing an amplifier with specific characteristics

I want to design a common emitter amplifier with these specifications: Av (gain) = 50 VCC = 5 V Rload = 0.25 kΩ Maximum symmetrical swing is considered but I can not get the collector and emitter ...
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0answers
35 views

I'm not getting the waveform in pspice simulation

I checked the circuit but couldnt get the waveforms. Transient is checked and time is 10ms-100ms.
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1answer
177 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 not ...
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2answers
207 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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0answers
25 views

trying to simulate pspice but there “Invalid value Circuit has errors … run aborted See output file for details Simulation aborted”

i'm just start learning how to use pspice but during quarantine day is hard to ask my lecturer, hope u guys help me to fix this this is output ...
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1answer
461 views
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0answers
22 views

Pspice software - simulation result of boolean circuit not as expected

I am trying to verify a boolean expression (AB +AC+AD') for which I constructed a circuit diagram, but the output simulation window shows 2 red lines. I am pretty sure my circuit is correct. Circuit: ...
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1answer
144 views

2nd order high pass filter PSPICE error

I'm working on designing a 2nd order sallen key high pass filter in PSPICE for a school project, but in subthreshold with resistors replaced with OTAs (transamp). Schematics shown in figures below. ...
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1answer
3k views

OrCAD PSPice less than 2 connections error while simulating

I just started using PSPice and I don't know much circuits theory but I need to simulate this circuit and find Vout/Vin: I did this using capture but after running simulation I get this error: ...
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1answer
29 views

OrCAD doesn't yields same result for this difference amplifier

The question says: Design an op amp circuit with inputs \$v_1\$ and \$v_2\$ such that \$v_o = 3v_2-5v_1\$ One way to realize this circuit is to utilize difference amplifier which satisfies this ...
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1answer
228 views

Can Orcade (PSPICE) actually simulate MOV(Varistors)?

I am using Cadence-Orcade Lite. In it I have a circuit in which I want to note the behaviour of varistors (MOV, PSPICE models exist in Orcade for various varistors). I am using LS40K680QP/EPC Model ...
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1answer
52 views

Why does the Zener diode's simulation model differ so much from datasheet specifications?

I was trying to design a circuit with a Zener diode by using its datasheet specifications and noticed there was a very big difference between the design and the simulated circuit. After inspecting the ...
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0answers
34 views

How to compute Rth for this circuit using OrCAD PSpice

Take a look at this circuit The question asks to find Rth and Vth between a-b terminals. Hand calculation yields Rth=3.857 and Vth=4V. With OrCAD, the result is shown below using Bias Point ...
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2answers
21 views

How to write subcircuits netlists in Spice with multiplicity factors?

I am trying to port a behavioral device model from Cadence Spectre to Spice. In Spectre it is very easy to instantiate multiple parallel instances of a subcircuit automatically - one just calls the ...
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1answer
62 views

Floating node error in orcad pspice

i am new to orcad pspice simulation,when i try to simulate the isolation amplifier(AMC1300) ,i got the error like floating node and less the two connections, but i connect power symbols and gnd ref (0)...
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1answer
16 views

Increase the size of ltspice error log file contents

In my circuit when I am sweeping many values and total combinations are higher (>2K), only initial values are captured when using .measure command for each combination. I want to increase the ...
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1answer
164 views

SPICE .DC LIN sweep directive w/ variables for START, END, and INCREMENT args

According to most of the SPICE references I've read, the form of the .DC sweep directive is ...
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0answers
16 views

problem with a swith tclose in pspice

I've been trying to simulate the circuit above in time domain mode with pspice and i've used Sw_tClose/ANL-MISC to simulate a switch which gets closed at time t=0 , but the simulation as you can see ...
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2answers
89 views

Transient solution of current in circuit with two coupled inductors, with resistances

Circuit in question is given below. I want to find why I can not get the same current waveform as PSpice gives me. Basically I want to calculate formula for i1(t) by hand and get something as close ...
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1answer
30 views

positive voltage from non-inverting amplifier is cut off

I'm experimenting with simulations in Kicad and have weird behaving output voltage and input current. R2 is being tuned in the simulation window to 2k. I'm using TL082 as the subcircuit for the opamp. ...
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1answer
118 views

PSPICE simulation

I have a PSPICE file that contains approximately 200+ transistors. Naturally, simulating the whole circuit everytime I make a change takes a while. Is there anyway to run a simulation measuring only ...
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2answers
272 views

How to make a DC sweep with negative change in pspice orcad?

I have the following circuit and I want to varry V1 from 24V to 0v while keeping V2 = 5V, naturally I tried using DC sweep simulation with start value of 24V, end value of 0V and variation of -1, but ...
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0answers
25 views

How can I estimate the Rds(on) parameter of MOSFET in PSPICE LEVEL 3 model?

Recently I was designing a DiffAmplifier model, whose gain is obviously gmRout. However, I can't get the Rout parameter of my MOSFET, which is MbreakN3 in OrCad. I have checked the Pspice Model and I ...
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2answers
64 views

Square wave oscillator on PSpice simulation

I'm new to PSpice and here I was trying to simulate a square wave oscillator using a LM193 on PSpice. Here is the circuit that I've created there: Edit: The capacitor C1 has an IC set to 0 However, ...
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1answer
933 views

Unable to set the initial conditions for a capacitor or an inductor in PSpice?

I'm new to PSpice and working on setting up my initial conditions for a capacitor and an inductor in a series RLC circuit. However, whenever I try to set up my initial conditions, the IC box is greyed ...
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0answers
24 views

Gradually Varying PWM in PSPICE

How do I gradually vary the pulse width in the "VPULSE" model? I tried using parametric sweep but it does not produce the correct waveform or I don't know how to do a parametric sweep in ...
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1answer
40 views

Why an ideal LC oscillator has a highly damped response in Spectre but not in PSpice?

I'm just curious about why a ideal LC oscillator (See Figure) has a damped response in Spectre Simulator but not in Ngpsice. In both cases I'm using 5V of initial condition. I'm also using gmin=0 and ...
0
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1answer
373 views

I have been trying to simulate this but it won't and it gives me those 2 errors

I have been trying to simulate this citcuit but it won't and it gives me those 2 errors
0
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1answer
146 views

PSpice - simulation worst case - delay on AND gate?

I have a question to someone who is familiar with PSpice analysis. I have a simple circuit as below and everything works good with "typical" simulation - dstm1 gives positive impulses continously and ...
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0answers
36 views

Exponential voltage source Pspice

I want to put an exponential voltage source in Orcad / Pspice that \$V(t) = e^t\$. I used Vexp and I don't know how to set \$V1, V2, Td1, Td2, Tc1, Tc2\$. I found an equation $$V(t)= V1+(V2-V1)((1-e^\...
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1answer
80 views

Setting Rds(Ron) for PMOS for LDO

I am modeling LDO using ZXCL280 Datasheet. By understanding datasheet dropout voltage of the PMOS is seen as 1.46Ω(From page 5 ...
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1answer
23 views

Floating Nodes Error in Simulation in ORCAD PSPICE

Does anyone have any insight as to what exactly is wrong with my circuit on Orcad/PSPICE? My name is in the project name so I blurred it out for obvious reasons
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1answer
68 views

Strange Error amplifier of LDO

I am trying to work out what function the components in inverter colors serve, this is a schematic I have derived from a net-list to make it easier to explain my answer ...
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2answers
8k views

Pspice error: voltage source and/or inductor loop

I'm trying to simulate the above circuit in Pspice, but I am getting the error: Voltage source and/or inductor loop involving V_V5 I looked it up and it says ...
1
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1answer
48 views

Output voltage of Class B Amplifier with global negative feedback

For the following schematic on the non-inverting input is applied a sine wave. Shouldn't be the output on R19 0.9 out of the input voltage, by using a voltage divider between R31 and R19. From my ...
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1answer
29 views

Why signal coming out of a Constant K filter takes 0.5ms to stabilize?

I made a simulation of an audio amplifier with an input signal of 200 microVolts. The question is why my filter does not deliver the desired output, which operates between 512 Hz and 2048 Hz. From ...
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0answers
73 views

No PSpiceTemplate warning in PSpice

I am trying to simulate the following circuit in PSpice, but I face the this warning in base of the transistor. changing the transistor didn't solve this issue. Please help me fixing it! WARNING: [...
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1answer
61 views

PSpice library for a speaker?

I am trying to simulate a current driver using TIP31 transistor for a speaker with known resistor and wattage. Can anyone please help me find a PSpice library for speakers? If there is not a library, ...
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0answers
31 views

1/sqrt(f) low pass filter slope [duplicate]

I would like to emulate a 1/f noise source in PSPICE. If I use the EVALUE component in the Analog Behavioral Models library, and use the function RND()-0.5, I have a zero-centered white noise source. ...
0
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1answer
47 views

OrCad PSpice: Did I design the circuit wrong?

I keep getting 0 volts when I design this circuit but I was supposed to get a value of 1V at least. How I would be able to fix this circuit? The circuit that we were supposed to design was Fig(74)....
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1answer
22 views

Problem in simulation results in PSPICE using LM3880 sequencer

When simulating this simple sequencer circuit in PSPICE, I obtained these results which are not the wanted ones: I was supposed to have sequences but here I don't know what it is. The right sequence ...
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3answers
53 views

Can I connect the primary of two coupled inductors (transformer) directly to mains voltage in parallel or do I need intermediary circuitary?

Examining a voltage regulator schematic, I believe I can connect the primary side of a step down transformer to mains voltage directly to step it down on the secondary, but PSpice doesn't let me ...
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2answers
232 views

CE amplifier design for audio amplifier

I am trying to design an audio amplifier which provides a maximum gain of 20dB (or) 10V/V. For the circuit I designed, the lower half of the amplified signal is being clipped. I am also attaching ...
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1answer
36 views

MOSFET Differential Amplifier Bode Plot

I've created a MOSFET Differential Amplifier in PSpice, the schematic of which I've attached. However, when doing an AC sweep and adding a trace to do a Bode plot, the graph is a flat line, and I don'...
1
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1answer
36 views

Pspice: parametric gain of dependant source

I am trying to create my first circuits in Pspice and I want to implement this command: E1 node1 node2 VALUE={I(E1)*V(2,0)} From my understanding, it represents a voltage-dependant voltage source ...
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2answers
56 views

PSpice: value of resistor controlled by a function

I am using PSpice to simulate the parasitic BJT of a power VD-MOSFET, which under certain conditions can be turned on and lead to the destruction of the cell. I have designed a model that is working ...
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2answers
96 views

how does Switch work in Psipce?

I want to use this element to create a square wave(I know it's possible to make it using VPULSE): But I don't know how VON and VOFF work. Can anyone help?
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0answers
29 views

Current mode buck modeling

I am following this document Loop response consideration in PCM. Here I am implementing fig 5 schematic in page 9. From equation 1 to 22 got me some of the hidden values of the schematic which I have ...
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2answers
26 views

Cut Off mode of an NPN transistor with PSPICE

]2 I am trying to model the cutoff mode of an NPN transistor with a switch that is connected to the base. Unfortunately, it shows current going through. I am using ORCAD Capture. Does anyone know ...

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