In the last edition of Don’t Fear the Filter, we built up two examples of the simplest and most-used active filter of all time: the two-pole Sallen-Key lowpass. This time, we’re going to put two of ...

When you design an analog, lowpass, antialiasing filter, you would expect its gain amplitude to continuously decrease beyond the filter's cutoff frequency. For the most part, this assumption is a safe ...

Do we really need another design tool for Sallen-Key filters? Aren’t there enough [i] [ii] [iii] [iv] [v] already? Obviously, you and I think that there’s something more to say on this topic, or you ...

I was concocting a rather silly low-pass filter design, when I remembered that Messrs Sallen and Key did it better in the 1950s, and decided to use their two-pole design to implement a Butterworth ...

Michael Steffes challenges conventional approaches to Sallen Key Filter design. He says today's components and VFAs offer greater flexibility. This opinion piece links to more detailed explanations.

Sallen-key是设计有源滤波器设计的一种拓扑结构，又称塞伦-凯型滤波电路。是VCVS（Voltage-controlled voltage-source）滤波器的变种，由麻省理工学院林肯实验室的R. P. Sallen and E. L. Key 在1955所提出。 图 1 显示了采用单位增益运算放大器实现的通用单位增益 Sallen–Key 滤波 ...

Recently, people in various publications have been pointing out that using an ordinary op amp in a Sallen-Key filter can cause problems. A typical op-amp circuit, as shown in Figure 1, can have a ...

There comes a time in every electronic designer’s life when, whether they know it or not, they need an analog filter in their design. If you’re coming from a digital background, where everything is ...

Sallen-Key滤波器是一种经典的有源滤波器拓扑结构，由运算放大器、电阻和电容等基本元件构成。该滤波器以其结构简洁、性能稳定等优势，在信号调理、音频处理和传感器接口等应用场景中得到广泛采用。 作为二阶有源滤波器的典型代表，Sallen-Key拓扑仅需单个 ...