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LTSpice: When running a linear AC simulation, how to view the voltage ratio between two voltages?

how to vary the threshold voltage of a MOSFET for simulation in LTSPICEHow to run new .meas commands without having to rerun the whole ltspice simulation?How to trace down why LTSpice simulation is slow?LTSpice simulation :Unable to check the output valuesHow to interpret LTspice simulation outputs for improving dual channel boost converter design using LTC3788LTSpice: How to vary resistances in a simulation depending on the value of a voltage?How can I change an LTspice .model parameter during transient simulation?LTspice simulation of AD8421 instrumentation amplifier giving incorrect output voltagesLTspice parametric sweep: how to force the simulator to continue with the next step?How can I force LTspice to redraw a plot during a long simulation?

3

$begingroup$

For example, how would I see the ratio between Vi and Vo for a linear AC simulation?

ac simulation ltspice

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asked 7 hours ago

J.D.J.D.

1183

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J.D. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment | 

3

$begingroup$

For example, how would I see the ratio between Vi and Vo for a linear AC simulation?

ac simulation ltspice

share|improve this question

asked 7 hours ago

J.D.J.D.

1183

New contributor

J.D. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

For example, how would I see the ratio between Vi and Vo for a linear AC simulation?

ac simulation ltspice

share|improve this question

asked 7 hours ago

J.D.J.D.

1183

New contributor

J.D. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

asked 7 hours ago

J.D.J.D.

1183

New contributor

J.D. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 7 hours ago

J.D.J.D.

1183

New contributor

J.D. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 7 hours ago

J.D.J.D.

1183

New contributor

J.D. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 7 hours ago

J.D.J.D.

1183

2 Answers
2

active

oldest

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3

$begingroup$

As you can read here, LTSpice can plot a mathematical function of the traced variables. You just have to edit the plot to specify the functions.

An example from the from the linked page is shown below. As mentioned in the comments, to edit the plot function you can right click on the name. The plot name is the green string starting with "1.1*pow...".

share|improve this answer

edited 4 hours ago

answered 7 hours ago

crj11crj11

4,112622

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Great! Stupid question, how do I get to the expression editor? (I'm on a Windows machine.)
  $endgroup$
  – J.D.
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Right click on the trace name. The green (1.1*pow(V(9) ...) in picture above.
  $endgroup$
  – Huisman
  5 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you! I'm a first time user for LTSpice. Your help is much appreciated.
  $endgroup$
  – J.D.
  3 hours ago
  

  
  
  
  

add a comment | 

3

$begingroup$

What you see in an AC simulation is the ratio, but expressed in decibels. To see the ratio properly you would need to change the Y axis from logarithmic to linear. (right click)

This will be expressed in volts still but you can change the expression from V(y) to V(x)/V(y) as in crj11's answer.

share|improve this answer

answered 6 hours ago

loudnoisesloudnoises

1,366920

$endgroup$

add a comment | 

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3

$begingroup$

As you can read here, LTSpice can plot a mathematical function of the traced variables. You just have to edit the plot to specify the functions.

An example from the from the linked page is shown below. As mentioned in the comments, to edit the plot function you can right click on the name. The plot name is the green string starting with "1.1*pow...".

share|improve this answer

edited 4 hours ago

answered 7 hours ago

crj11crj11

4,112622

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Great! Stupid question, how do I get to the expression editor? (I'm on a Windows machine.)
  $endgroup$
  – J.D.
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Right click on the trace name. The green (1.1*pow(V(9) ...) in picture above.
  $endgroup$
  – Huisman
  5 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you! I'm a first time user for LTSpice. Your help is much appreciated.
  $endgroup$
  – J.D.
  3 hours ago
  

  
  
  
  

add a comment | 

3

$begingroup$

As you can read here, LTSpice can plot a mathematical function of the traced variables. You just have to edit the plot to specify the functions.

An example from the from the linked page is shown below. As mentioned in the comments, to edit the plot function you can right click on the name. The plot name is the green string starting with "1.1*pow...".

share|improve this answer

edited 4 hours ago

answered 7 hours ago

crj11crj11

4,112622

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Great! Stupid question, how do I get to the expression editor? (I'm on a Windows machine.)
  $endgroup$
  – J.D.
  6 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  Right click on the trace name. The green (1.1*pow(V(9) ...) in picture above.
  $endgroup$
  – Huisman
  5 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Thank you! I'm a first time user for LTSpice. Your help is much appreciated.
  $endgroup$
  – J.D.
  3 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

As you can read here, LTSpice can plot a mathematical function of the traced variables. You just have to edit the plot to specify the functions.

An example from the from the linked page is shown below. As mentioned in the comments, to edit the plot function you can right click on the name. The plot name is the green string starting with "1.1*pow...".

share|improve this answer

edited 4 hours ago

answered 7 hours ago

crj11crj11

4,112622

$endgroup$

share|improve this answer

edited 4 hours ago

answered 7 hours ago

crj11crj11

4,112622

answered 7 hours ago

crj11crj11

4,112622

answered 7 hours ago

crj11crj11

4,112622

3

$begingroup$

What you see in an AC simulation is the ratio, but expressed in decibels. To see the ratio properly you would need to change the Y axis from logarithmic to linear. (right click)

This will be expressed in volts still but you can change the expression from V(y) to V(x)/V(y) as in crj11's answer.

share|improve this answer

answered 6 hours ago

loudnoisesloudnoises

1,366920

$endgroup$

add a comment | 

3

$begingroup$

What you see in an AC simulation is the ratio, but expressed in decibels. To see the ratio properly you would need to change the Y axis from logarithmic to linear. (right click)

This will be expressed in volts still but you can change the expression from V(y) to V(x)/V(y) as in crj11's answer.

share|improve this answer

answered 6 hours ago

loudnoisesloudnoises

1,366920

$endgroup$

add a comment | 

$begingroup$

What you see in an AC simulation is the ratio, but expressed in decibels. To see the ratio properly you would need to change the Y axis from logarithmic to linear. (right click)

This will be expressed in volts still but you can change the expression from V(y) to V(x)/V(y) as in crj11's answer.

share|improve this answer

answered 6 hours ago

loudnoisesloudnoises

1,366920

$endgroup$

share|improve this answer

answered 6 hours ago

loudnoisesloudnoises

1,366920

answered 6 hours ago

loudnoisesloudnoises

1,366920

answered 6 hours ago

loudnoisesloudnoises

1,366920