Questions tagged [subcircuit]

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2answers
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Creating D-latch using Nand gates in Logisim?

I have designed a D-latch using NAND gates. The problem is when I convert it into a subcircuit the output is False no matter what my second input(clock input)is? It only works if I put the default ...
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0answers
31 views

How to produce a register bank comprising four such registers in Logisim, sharing common data lines D0 … D7 and outputs <Q0 … Q7>?

I made a D-Latch circuit that looks like this: and I converted it into a subcircuit and made an 8 bit register like this: But how do I make a register bank using four such registers? Any help is ...
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1answer
477 views

Best practices for using subcircuits and hierarchical blocks in LTspice

I'm designing a series of circuits in LTspice and wanted to get some feedback on the accepted way to use subcircuits and hierarchical blocks. The LTspice manual is somewhat vague on these topics. In ...
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2answers
30 views

Understanding EOS SUBCKT behavior

I'm trying to modify an op amp to simulate its worst case behavior at end of life. In the common mode effect section of the LM124/NS I have the following ...
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1answer
545 views

LTspice (XVII) Use component instance name as a parameter

I am trying to to simulate a ferroelectric capacitor using simple schmitt triggers subcircuits : simulate this circuit – Schematic created using CircuitLab I would like to pass {R1} as a ...
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2answers
463 views

LTSpice: how do I pass to a function a component name as parameter?

Good morning all. I am implementing a subcircuit in LTspice, and I want also to modify the plot.defs to calculate some quantities with the voltages/currents inside the subcircuit. Thus, I will have a ...
2
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1answer
467 views

LTSpice: “Can't expand empty subcircuit” error with HC4046 Model

I downloaded the symbol and model for the HC4046 Phase-Locked Loop chip from the Yahoo LTSpice group here: https://groups.yahoo.com/neo/groups/LTspice/files/%20Lib/CD4046/Others%20CD4046/ (You will ...
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1answer
2k views

Turning a Subcircuit block into a Transfer Function for faster simulation in SPICE

Is there a way to take a sub circuit definition (.subckt) and have SPICE (or in my case LTSpice) take the Transfer Function for it. Then have SPICE refer to this Transfer Function whenever a component ...
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2answers
8k views

How to make LTSpice sub-circuits available globally?

LTSpice Hierachy block can not be found if it is not in current working directory. I am using this tutorial to create sub-circuits in LTSpice: http://www.audio-perfection.com/spice-ltspice/...
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1answer
917 views

How to enter .subckt model in Ltspice?

This is a LTSpice model I created for a single electron transistor macro model: ...
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1answer
677 views

How to use a subcircuit in capture / spice

I am wondering how to add an IGBT .subckt file to a schematic in Orcad Capture. I already found out that if you have an '.NIGBT' model, you can use the Breakout library. But I cannot find out how to ...
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5answers
23k views

Is there a potentiometer model for LTspice?

I started designing a model for a three-terminal potentiometer in LTspice, since none are included and it's such a common component. Drawing the .asy symbol and the wiper terminal, it dawned on me ...
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1answer
806 views

How to change the temperature of sub-circuits in LTSPICE

I have subcircuits of a solar cell (resistors and diodes) in LTSPICE. I want to connect the solar cells (sub-circuits) together. However, each solar cell has a different temperature. I can set the ...
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1answer
502 views

PSpice Error subcircuit internal node floating

I am trying to simulate a circuit with a variable capacitor in PSpice. The circuit is a simple test circuit like this: And the VARICAP model description is this: ...
3
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1answer
11k views

LTspice: How to convert .asc file to netlist?

Using LTspice I can create .asc files which contain the information about my circuit. Is there a way to convert this information to a netlist? I am looking for a ...
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1answer
4k views

LTSpice, MAC97A8 TRIAC model, Vgs error

I'm having some difficulty getting LTSpice to like a TRIAC model. The specific error it throws is "Missing model definition for VGT-0.65". The trouble is that VGT is a subcircuit parameter, not a ...