Active filter bandpass circuit

qiaoqiaoljq

Active filter bandpass circuit [Copy link]

How do I choose the parameters of a bandpass circuit? I want to choose a center frequency of 100KHZ. Can anyone share some experience?

fighting

Bandpass filter circuit A, R1, Rf —— In-phase proportional operation circuit R, C —— Low-pass filter circuit R2, C —— High-pass filter circuit R3 —— Introduce feedback to improve characteristics Center frequency f 0 = 1 2 π RC = 15.923 kHz (When R3=R, R2=2R, it can be estimated according to this formula) A uo = 1 + R f R 1 = 1.1 Q = 1 3 ? A uo = 0.53 B = f 0 Q Experimental content: 1. Observe the amplitude-frequency characteristics Click the "Show Graph" button in the toolbar to observe the amplitude-frequency characteristics. 3. Test the center frequency Open the Bode plotter panel and click "→" continuously to test the center frequency. Measured value: center frequency f0 = 15.85kHz 4. Observe the influence of Q on the amplitude-frequency characteristics. Change Rf to 1kΩ, 1.8 kΩ, 1.9kΩ and 1.95kΩ, and the corresponding Q values are 1, 5, 10, 20, respectively, and observe the amplitude-frequency characteristics. Conclusion: The larger the Rf, the larger the Q value, the narrower the passband, and the better the frequency selection. Simulation experiment demonstration Return to the simulation experiment homepage

fighting

http://www.lyct.edu.cn/jp/md/md/fangzhenshiyan/chap-7/7-9.htm It seems to be here! I wonder if it says the same thing?