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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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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Water level indicator using CMOS inverter

I want to build the below circuit. The circuit has three levels to indicate water. low->o/p LED. Medium->O/P LED. High->O/P LED + Buzzer. Each level has two types of MOSFET; they work as CMOS ...
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Measure pad size on Allegro Free Viewer 17.4

I need to measure the pad size(length and width ) of an IC pad. May I know how to do the same in Allegro I have highlighted one pad for your reference.
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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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OrCAD/Allegro Capture 17.2 - Changing text justification en masse

I'm using OrCAD/Allegro Capture 17.2. Is there a way to change the text justification for the labels of multiple components simultaneously? For example, selecting multiple labels and then changing the ...
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OrCAD Footprint in .brd layout different from the .dra file

I made a custom footprint for an 8 pin TSSOP IC, using custom padstacks and creating a new package (no wizard). Each of the four pins on a side are 0.3mm wide and 0.5mm apart (BSC). In the .dra file ...
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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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there is an undefinable text as .subckt in the edit spice model section. how can I find the correct one?

I want to copy and use the .SUBCKT model of UCC28C43 which is in an OrCAD capture schematic. I did as follows but the .subckt contains the undefinable text. why is that so? how can I find the correct ....
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Symbol used for device not found error in Orcad Capture

I have made a schematic and downloaded the footprints and symbols from UltraLibrarian. When I click on a symbol on my schematic, I can see that the footprint is attached to it. But when I create a ...
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User-Defined voltage / current in OrCAD Capture CIS

I want to excite my circuit with a user-defined voltage source, such as v(t) = t*e^(t)... . Search results suggested using bsource, a part within the analogLib libary. I don't have analogLib nor have ...
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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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Buck Converter Simulation in OrCAD Capture Lite

I have this really simple buck converter circuit but I am getting really funny results. I tried different input voltages (12-650 V), no matter what I put, it doesn't affect the output. The output ...
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Altium Simulations

Can Altium do >300V simulations? I don't think there is anything wrong with this circuit. I even tried removing the diode, inductor and capacitor and directly connecting with the resistor for ...
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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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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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Why am I getting red lines when simulating this circuit?

I am trying to simulate this circuit but I end up getting red lines on the Pspice simulation, what could have caused this error. The circuit I am trying to emulate in pspice, Here is the circuit ...
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How to set a minimum distance between components in OrCAD PCB Designer?

I am using OrCAD PCB Designer Professional 17.4 and I can't setup the minimum distance between components. This is the "DFA Constraints Dialog" from Allegro in which you can make the setup, ...
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PWM Generator in OrCAD, doesn't simulate what it should

I have a project, to design a Pulse Width Modulation Generator in OrCAD 17.2. I surfed the whole internet to find a proper circuit to be able to draw it in Orcad, there are no errors, but when i ...
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Nom.lib in OrCad

What is the nom.lib in orCad? Why do we need it when trying to simulate a circuit? When I was about to simulate, I saw a youtube video where the guy says that I need to go to 'configuration files' and ...
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Import DXF defined padstacks in to Allegro/Orcad PCB

I'm using Orcad PCB Professional 17.4-2019 S017 I've got a symbol with some funky pads on it, one the padstack editor cannot generate. Here's where I'm trying to get to. Green is mask boundary, blue ...
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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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2 answers
141 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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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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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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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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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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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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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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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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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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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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1 answer
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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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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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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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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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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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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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2 votes
1 answer
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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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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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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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1 answer
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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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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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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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1 answer
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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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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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1 answer
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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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1 vote
1 answer
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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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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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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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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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