LC低通滤波器计算器
Butterworth Pi LC Low Pass Filter Calculator
A PI filter is a filter that has a series element and two parallel elements connected in the
shape of the Greek letter PI.
Butterworth filter are characterized by a constant gain (flat response) across the midband of the circuit and a 20 dB per decade roll-off rate for each pole contained in the circuit.
Butterworth filters are termed maximally flat magnitude response filters, optimized for gain flatness in the pass band. The attenuation is -3db at cutoff frequency. Above the cutoff frequency the attenuation is -20 db.
The Butterworth is the only filter that maintains same shape for higher orders whereas other varieties of filters (Bessel, Chebyshev, elliptic) have different shapes at higher orders.
A Low pass filter is a filter that passes low-frequency signals but attenuates signals with frequencies higher than the cutoff frequency.
Butterworth filter are characterized by a constant gain (flat response) across the midband of the circuit and a 20 dB per decade roll-off rate for each pole contained in the circuit.
Butterworth filters are termed maximally flat magnitude response filters, optimized for gain flatness in the pass band. The attenuation is -3db at cutoff frequency. Above the cutoff frequency the attenuation is -20 db.
The Butterworth is the only filter that maintains same shape for higher orders whereas other varieties of filters (Bessel, Chebyshev, elliptic) have different shapes at higher orders.
A Low pass filter is a filter that passes low-frequency signals but attenuates signals with frequencies higher than the cutoff frequency.
LC低通滤波器计算器公式与使用说明
计算依据：fc=1/(2πRC)；f0=1/(2π√(LC))；Q=f0/BW。
输入：截止/中心频率（Hz）、电阻R（kΩ）、电感L（mH）、带宽BW（Hz）；输出：LC低通滤波器计算器计算结果、R/L/C值、传递函数、增益和关键频点。
公式依据与参考资料
公式口径参考：www.analog.com。实际器件参数请同时核对数据手册。
常见问题
LC低通滤波器计算器如何使用？
按页面字段输入截止/中心频率（Hz）、电阻R（kΩ）、电感L（mH）、带宽BW（Hz），执行计算后核对LC低通滤波器计算器计算结果、R/L/C值、传递函数、增益和关键频点。
LC低通滤波器计算器采用什么公式？
本页依据fc=1/(2πRC)；f0=1/(2π√(LC))；Q=f0/BW计算，并按页面标注的工程单位换算。
计算结果适合什么场景？
结果适合学习、方案估算和交叉复核；器件选型还应结合数据手册、制造公差、温漂和安全裕量。