Pspice simulation problem

rg350dxlover said:

Hello. I'm designing a 1st order butterworth filter. I got all the values and the shape of the gain correct. Only problem is that the y-axis scale is just wrong. I mean the scale is in fV. It's supposed to be just V. I don't know what setting I'm supposed to change. Help!! Thanks..

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LvW said:

rg350dxlover said:

Hello. I'm designing a 1st order butterworth filter. I got all the values and the shape of the gain correct. Only problem is that the y-axis scale is just wrong. I mean the scale is in fV. It's supposed to be just V. I don't know what setting I'm supposed to change. Help!! Thanks..

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The problem is not a false scaling of the axis.
Your drawing has an error: You have connected to the negative voltage supply node a positive voltage. Change the sign - and every thing will be OK.
Two comments for a better understanding:
1.) Normally, the y-axis is scaled in dB (better and quicker evaluation of transfer curve shape)
2.) A Butterworth response belongs to orders of 2 or higher. A 1st order filter cannot be split up into several response types.

Regards

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