Questions tagged [orcad]

OrCAD is an EDA (electronic design automation) suite that includes schematic capture, PCB layout and several other related modules.

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34 views

Problem simulating 2-bit counter with OrCAD

I used OrCAD Capture to create a 2-bit counter using two D-type Flip-Flops (DFFs). Here is the schematic: My problem is that I get no output when I try to simulate it. I know for sure that V3, the ...
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8 views

PSpice Model Editor Not Giving .dll and .lib Files for VerilogA Module

I am trying to learn how to import VerilogA Modules into PSpice using the Model Editor. For now I am starting with a simple VerilogA model of a capacitor so I can learn how to use the Model Editor and ...
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1answer
797 views

Orcad Schematic Capture. Instances vs Occurrences

Using Orcad capture to create a multi-page hierarchical schematic I used the "Annotate..." option to renumber all parts. First set the them to "?" then incrementally update them. However, after this ...
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2answers
40 views

How to simulate LVT BiCMOS PSpice models?

I'd like to simulate the digital 74LVTxx chips with their analog characteristics. Packages like Multisim and OrCad only have the basic models (e.g. 74LS04N). ...
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42 views

PSpice Simulation of a 741 Op-Amp BJT configuration not working?

I'm simulating the following circuit of the 741 operational amplifier with BJTs: I've configured my circuit to be a non-inverting fashion, so in theory the gain would be -Rf/Ri. However, no matter ...
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18 views

Soil moisture sensor circuit how to link the whole scheme

This is a soil moisture sensor circuit, composed of the following blocks: oscillator (green), the electrodes (yellow), amplifier (blue) and rectifier with Trigger Schmitt (red). The schematic turned ...
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16 views

How to install the downloaded model file to pspice?

I am newbie in pspice.I am using 17.4 version of Orcad.I have downloaded mosfet model from a site.Model includes this files: "device.lib" , "device.olb" and "device.ind" ...
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2answers
4k views

Where is the pspice “output file”?

This is the error message when trying to run a simulation for one of my models ...
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50 views

Sample and hold & analog shift register

I have this circuit (see first picture.) it's an analog shift register where instead LF386 I use LF398H. This circuit must provide an hyperchaotic behavior for initial conditions x1(0) = l, x2(O) = O....
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1answer
53 views

RC circuit and HEX SCHMITT-TRIGGER INVERTERS

I have a complex circuit, and I am dealing with a problem that appears. I have a RC circuit followed by a 7414 Trigger inverter. My input voltage is 90mV and after the simulation the output looks like ...
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1answer
254 views

iv plot for NPN BJT

I have done a “parametric sweep” of the DC voltage source VCC ranging from 0 to 30 V and on the current source with values of iB = 0,50,100,150,200, and 250 µA. Below is the plot iC vs vCE (vCE being ...
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387 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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727 views

OrCAD PCB Designer File Export to PDF (Gerber)

i want to export this PCB circuit to PDF exacty as it is (above image), but when i click on file -> export -> PDF, its shows exacty the window on the left "Allegro PDF Publisher", then i click on film ...
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911 views

How to include schematic page name in OrCAD BOM

I am generating BOM in OrCAD. How can I include a part's schematic page name in the Bill of Materials csv file.
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1answer
149 views

Not connected pin in Orcad Capture

I have a pot (R8), as you can see, C6 capacitor is connected to its middle terminal, I have trouble implementing this in Orcad as it says that the negative terminal of the capacitor is connected to ...
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288 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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316 views

Voltage Multiplier Problem

I´m working on a voltage multiplier with 5 stage, i´m using the same capacitor and i think that my problem is the current load but i actually think that with a resistor in the output of the multiplier ...
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24 views

How can I wire two parts easily in Cadence OrCad?

I have two simple parts in OrCad layout. How can I wire these two parts easily, like from point 1 to point 2? When the big red dot comes out, I click the left and then when I move the mouse to ...
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1answer
111 views

How to find Vthreshold and K (or beta) in Pspice/Orcad

Regarding M2n7000 transistor in OrCAD, I want to find its Vthreshold and Beta (or k) by its edit PSpice model. This is what I get : And by Vthresh and Beta (or k ) I mean the parameters of this ...
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1answer
4k 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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26 views

How can I fix the problem of floating nodes in Pspice?

I have so many errors saying there is floating nodes in my circuit, I used a grounded big resistance in some nodes to fix them but there are so many floating nodes errors yet, my circuit is very large ...
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1answer
45 views

I have a problem with using a voltage controlled switch in Pspice

When using the voltage controlled switch in Pspice, the current flowing on the other side of the switch is equal to the current flowing through the voltage source controlling the switch. Why is it so? ...
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35 views

Error while generation gerber files

I've created a layout and I want to generate gerber files for further production. I'm using Cadence OrCAD software. But when I try to Create Artwork, I'm getting an error. I've checked the dbdoctor ...
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13 views

Working with Mentor Graphics xPCB Planner\xPCB Layout and OrCAD

I'm working with Mentor Graphics xPCB Planner (very similar to xPCB Layout) for placement and OrCAD Capture CIS 16.5 for schematic design. I'm interested in working with both tools in parallel, where ...
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16 views

How to use .SUBCKT in OrCAD Capture?

I needed an LM565 to simulate, but unfortunately, the software did not have that LM565, and I accidentally saw this code on the Internet! But I do not know how to give this code to the software! The ...
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1answer
39 views

Buck converter in pspice output value changes depending on the resistance. How do I correct this?

I am trying to design a buck converter and simulate in pspice, however I am running into trouble. The voltage on the load (R1), varies significantly when the load value changes. How do I correct this ...
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32 views

About hole diameter size, tin diameter size and solder mask diameter size for pad of through hole components in Altium PCB design

Is there any rule that relate the tin diameter size and solder mask diameter size with the hole diameter size for the pad of through hole components in Altium PCB design?
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54 views

I keep getting an error in OrCAD using a certain op-amp

I keep receiving this error in OrCAD. I am trying to use an LM741 operational amplifier for my schematic but am unsure why I can't open it. Error: Placing symbol instance for Model LM741 failed ...
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2answers
63 views

Why doesn't OrCAD show zero voltage here and can I fix it?

I designed this simple circuit here : as it can be seen the software shows \$-8.572pV\$ (I assume it means pico volts). But shouldn't it be \$0V\$? Is this some kind of error due to computers being ...
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41 views

Pspice - how to fix 'Simulate' [Ubuntu]

I have tasks to do for school and after 'draw' a circuit I need to start to Stimulate, but it won't work. If anyone knows how to fix this big thanks How to fix this with OrCAD Pspice AC/DC Demo. I ...
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13 views

Net Tie Loses Connection

I've created a net tie in OrCAD software. Everything seems to work, but there is one thing I don't get. There's no problem when I connect to shapes with the nettie by placing it directly on two layers ...
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1answer
567 views

PSpice models for BC547C, BC557C, BF245A, BC548C and BD135-16

I'm trying to make this circuit in OrCAD Capture CIS to simulate it in spice: I found the resistors and capacitors in the ANALOG library. I also found all the transistors, except Q3, in the ...
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1answer
144 views

What is no-probe-top in Cadence OrCAD

There is a rectangle around the outside of my OrCAD footprint (pointed to with the blue arrow), and it is on the no-probe-top layer. I googled it but I couldn't find any explanation of what that layer ...
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2answers
77 views

I need to create pad on the copper zone like as shown on the picture in Orcad PCB Editor 16.6

I am noob in Orcad PCB Design, I need a solution for creating pad on top of the copper zone as you can saw on picture, i need to create pad like that. I am using Orcad 16.6. Kindly give me the answer ...
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30 views

Crossed pin in the jumper

Could you tell me why do I see the crossed rectangle on the 3V3 pin? The element that applies to 3V3_PSU and 3V3 pins is a jumper. Do I need to worry about it?
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53 views

Netlist generation error

I have been struggling with updating a netlist and design synchronization in OrCAD. My co-worker created a schematic in Capture CIS and prepared an initial layout. Then, I took over the project and ...
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1answer
31 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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57 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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1answer
1k views

Alternative spice model of TI CD4066b

I'm busy working on a uni practical in which we are required to construct a chopper modulator and I'm busy creating a schematic in orCad to run some simulations. I'll be using a Texas Instruments ...
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2answers
535 views

How to specify polarization voltage in polarized capacitors in Orcad Capture

I have a polarized capacitor like below. it's 1uF and 16V. the schematic in Orcad is like this: How can I specify that 16V voltage?
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105 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
59 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
411 views

OrCAD: Uniqueness/Scope of Net Aliases, Busses, and Net Groups, Hierarchical Ports, and Off-page Connectors

I am using Allegro/OrCAD Capture. I need some confirmation about the scope of some various types of nets in Allegro/OrCAD Capture, particularly with regards to hierarchical design and projects with ...
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90 views

Mounting hole with vias in OrCAD

I want to create a mounting hole with vias around it. I don't know how to approach it so I've tried to do it on my own. I'm using OrCAD PCB Designer. I have created a mounting hole padstack with ...
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1answer
89 views

What's the purpose of a drill symbol?

I use OrCAD environment for designing PCBs but I've never thought about what is the purpose of a Drill Symbol in padstack creator. The diameter is set in the Drill bookmark and other parameters like ...
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1answer
68 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
31 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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1answer
43 views

Vias affect traces

I have been working on a project of a 4-layer PCB. Every time I add a via in order to connect two pins, another trace breaks and changes its positon. I've added pictures to explain what I got on ...
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1answer
72 views

On measuring the common mode gain of an op-amp using a simulator?

I have been trying for a while now to measure the common voltage gain of the LM741, which according to Op Amps: Design, Application, and Troubleshooting page 21 is around 6, using Multsim and Orcad. ...
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1answer
53 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)....