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#1
04-23-2011, 08:11 AM
 sarjan88 New Member Join Date: Apr 2011 Posts: 1
band reject filter design

Design a circuit using op-amp that will reject the 60kHz power line noise and also reject high signal frequency above 800Khz. The stop-band width around the 60kHz centre frequency is 10kHz. Use a cascade of 1st order high pass and 1st order low pass filter to implement this circuit. The voltage gain at passband frequencies is 10.

As mentioned in the title, can sum1 tell me this should be a band reject or band pass filter?
i try to construct a band reject filter but the result seem like not correct.

here is my circuit using multisim
http://i325.photobucket.com/albums/k...23/circuit.jpg
here is the result using AC analysis in decibel
http://i325.photobucket.com/albums/k...123/result.jpg
bode plot

can sum1 help me out of this?
thanks
#2
04-23-2011, 03:18 PM
 beenthere Senior Member Join Date: Apr 2004 Location: Missouri, USA (GMT -6) Posts: 15,815 Blog Entries: 10

Quote:
 Design a circuit using op-amp that will reject the 60kHz power line noise
What part of the world do you live in? I thought that power line frequencies were either 50 Hz or 60 Hz.
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First comes the hardware, then the software.
#3
04-23-2011, 03:51 PM
 Audioguru Banned Join Date: Dec 2007 Location: Ontario, Canada Posts: 9,411

Your V3 battery is only 0V.
All opamps are biased at 0V and with the single positive supply they become rectifiers.
With your single +10V supply all opamps should be biased at +5V, not at 0V. Or use a double-polarity supply.

 Tags band, design, filter, reject

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