TI E2E Community
Other Analog & Touch
/etc... Analog Forum
UAF42 filter design Problem
I am desinging filter using UAF42 to design a 60 Hz Notch Filter and following the origional design application given at http://focus.ti.com/lit/an/sbfa012/sbfa012.pdf
But i am facing a problem that the shape of origional waveform is also changed while filtering.
Kindly guide me what could be the problem. Pictures of the results are attached in the attchment.
It would help if you posted a scematic of your circuit.
Regards, Neil P. Albaugh ex-Burr-Brown
Here it is
This 60Hz notch filter should be well behaved and what you are seeing is definitely not right.. I have attached your circuit with a simulation done in TINA.
It looks like there is another frequency being mixed in with your test frequency-- could your circuit be oscillating? That makes me wonder if perhaps the "Q" is set too high. The value on the circuit diagram is OK-- could that resistor be wromg? Another thing to check is your bypass capacitor-- you should have something like a 0.1uF ceramic capacitor connected from each supply pin to ground.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.