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LTSPICE CIRCUIT SIMULATION FOR CALCULATION OF DELAY

Ghayathri

New Member
As I was going through the forum about how to calculate delay in ltspice I came across this answer which said how to calculate delay for an inverter circuit. Could u please explain me how the spice directive commands work here and also what does {RE} refer to here.
 

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alec_t

Well-Known Member
Most Helpful Member
Welcome to ETO!
{RE} is a parameter (aka a variable) whose value is specified by the .param directive.
The LTspice 'Help' describes the .meas directive, which provides a measurement of a property under defined circumstances.
 

alec_t

Well-Known Member
Most Helpful Member
Its value is 1, so it is being used to tell LTS to measure the time of occurrence of the first rising edge of V(in).
 

Ghayathri

New Member
I have used the same .meas statements to calculate the propagation delay of my xor circuit but the value is high(0.04s but we are supposed to get in ps . Iam attaching the asc file for reference
 

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alec_t

Well-Known Member
Most Helpful Member
Why do you have VIN connected to P3 source and to V1?
 

Ghayathri

New Member
Sorry about the mistake in connection. Now i have corrected it and VIN is connected only to source of P3 as input and not connected to V1. I have attached the file for reference. Thank you
 

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