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Hi, I need to construct a filter to pass 5Hz and above. I'm also using this circuit to prevent any DC signals from passing (I have a DC offset that I need to get rid of). I'm using the equation f = 1 / 2*pi*RC (in which I found after derivation).
As of right now, I have two designs:
1) Series RC - works fine in SPICE.
2) Differentiator (OpAmp config) - can't get working on SPICE. I have no idea why it's not working. I've tried connecting pins 1 and 5 of the opamp to GND, as well.
This is what I have below:
http://img138.imageshack.us/img138/3764/14914103um3.png
I am using PSpice Schematics, Evaluation Version 9.1 - Web Update 1 for my simulations.
As of right now, I have two designs:
1) Series RC - works fine in SPICE.
2) Differentiator (OpAmp config) - can't get working on SPICE. I have no idea why it's not working. I've tried connecting pins 1 and 5 of the opamp to GND, as well.
This is what I have below:
http://img138.imageshack.us/img138/3764/14914103um3.png
Code:
* Schematics Netlist *
V_V2 $N_0001 0 5v
V_V3 0 $N_0002 5v
R_R1 $N_0004 $N_0003 79.5k
C_C1 $N_0005 $N_0004 .1u
R_R2 $N_0003 $N_0006 79.5k
X_U2 0 $N_0003 $N_0001 $N_0002 $N_0006 uA741
C_C2_BYPASS $N_0001 $N_0002 .01u
V_V_INPUT $N_0005 0 DC 0 AC 1
+SIN 2.4 50m 100 0 0 0
R_R3 0 $N_0006 10k
I am using PSpice Schematics, Evaluation Version 9.1 - Web Update 1 for my simulations.
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