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陷波器又称V型滤波器,是带阻滤波器的一个特殊例子。通常要求它阻止某一范围很窄的频率分量通过,而在此极窄的频带以外则要求信号无损失地通过。在通信设备和测试仪器中广泛地使用着陷波器。电路分析陷波器传递函数可表示为: 其中S=jω表示复数角频率。ω_0陷波器中心频率,ω=ω_0时分子等于零,即产生“陷波”作用。Q是陷波电路的品质因数。 RC双T电路可以作陷波器用,但其Q值不高。图1所示对称双T电路的Q值为1/4,采用极不对称的双T电路,Q值也不能超过1/2。提高双T电路Q值的方法是引入正反馈,但这种电路所用元件较多,调整比较困难,要使陷波点输出为
Trap, also known as V-type filter, is a special case of band-stop filter. It is usually required that it block a narrow range of frequency components from passing, and outside of this very narrow band require the signal to pass without loss. Notch waveguides are widely used in communications equipment and test equipment. Circuit Analysis The notch transfer function can be expressed as: where S = jω represents the complex angular frequency. ω_0 trap center frequency, ω = ω_0 when the molecule is equal to zero, which has a “notch” effect. Q is the quality factor of the trap circuit. RC double T circuit can be used as a trap, but its Q value is not high. The symmetrical double T circuit shown in Figure 1 has a Q of 1/4 and uses a very asymmetrical double T circuit, with Q values not exceeding 1/2. The way to improve the Q value of the double T circuit is to introduce positive feedback, but more components used in this circuit, the adjustment is more difficult to make trap point output