for a subtractor with sine wave

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deepu7

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*Analysis directives:
.AC DEC 1 0 20k
----------$
ERROR -- Invalid value
.PROBE V(alias(*)) I(alias(*)) W(alias(*)) D(alias(*)) NOISE(alias(*))
.INC "..\SCHEMATIC1.net"


pls reply as soon as possible for the above error
 

The directive ".AC DEC 1 0 20k" means you want to sweep by decades from 0 to 20kHz in just a single point !
You should specify a number of points greather than 2 (typically higher than 100)
 
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    deepu7

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In addition, you must not start at 0 Hz. Choose any frequency (0.001 Hz or even lower if you want) above 0 Hz as lower limit.
 

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