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The symmetrical double T circuit to improve the notch filter

2017-02-22 18:39  
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The symmetrical double T circuit to improve the notch filter circuit
Figure 1 is an example of the symmetrical double-T circuit. Under careful observation, we found that it is circuit synthesis of low-pass filter and high pass filter. In this circuit, usually the ratio of components grounding into the earth adopts 2C and R / 2 method. The reason for this is that the ratio can effectively make the attenuation frequency reach the spike values, but the Q value of this circuit is also dropped to 0.25, zero frequency The composition of the circuit is extremely simple, accoring to the circuit, we can see 2C capacitors is needed. The author's approach improves the cost, we can adopt two capacitors connected in parallel to process.