Part Number: TLV9062
Tool/software: TINA-TI or Spice Models
I'd like to simulate the noise by TINA, the circuit is as below. There are 2 stage pass band filter, and the parameters of each stage are the same. The high pass corner frequency is about 110Hz, and the low pass frequency is about 1.3kHz, the gain of each stage is 120.
The noise of first stage at VF1 is about 120uV, the same as I calculated by hand. For the second stage, the gain is 120, the first stage noise should be amplified by 120 and at least 120*120uV=14.4mV. Why the total noise at VF2 is only 10.59mV?
I have checked the bode plot, the gain and the corner frequency is as expected.
Could you please help me? Thank you！
Regards,Ronald MichallickLinear Applications
TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).
In reply to Ron Michallick:
In reply to Cera Wei:
Your output noise signal at VF1 is amplified by the noise gain on the third stage, not the signal gain. The remaining region is attenuated as shown in the image below.
Please let me know if there is anything else I can assist you with.
In reply to Ramon Jimenez:
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.