Intelligent electronic broadband bandpass filter moduleV1.0
1 Module introduction
Compared with passive filtering, active filtering can achieve no response without using inductors, and avoids troublesome magnetic leakage problems without the need for magnetic shielding. Secondly, because of the introduction of the amplifier can be compared with the passive filter passband signals not only energy loss, but also can be enlarged, the load effect is not obvious, multi-level connected influence each other is very small, with a simple method of cascade is easy to form high order filter. It can be easily assembled by using a universal standard device, which is small in size and light in weight. But it also has obvious disadvantages: because the op amp runs down with frequency, the open-loop gain needs DC power supply, and the reliability is not as good as passive filter. It is not suitable for high voltage, high frequency and high power applications.
Active filtering is widely loved by people in its medium and low frequency because of its good passband characteristics. Therefore, Ling Chi electronic portrait launch this active filter module is for everyone to save your design, layout, debugging time. Reach “ multifunction, you can use to get the &rdquo effect.
The main features of the active broadband bandpass filter module are as follows:
(1ImplementationVCVSBand wide bandpass filter(Butterworth) the theoretical stopband decay rate is-40dB/DeCade. Module default shipmentPassband range300Hz~3400Hz,Magnification factor1timesThe user can change the resistance capacitance value according to the requirements, thereby changing the cut-off frequency and the amplification factor.
(2) use the usualNE5532Double operational amplifier, the user can change the operational amplifier model according to the need to achieve higher cut-off frequency band pass filtering.
(3The module defaults to adoption±5Vpower supplyThe user can change the power supply according to the operating voltage of the operational amplifier.
(4The input / output interface takes two forms, and the other isPin interface (default)Yes, oneSMAInterface.
(5) this module has designed the jackGNDFor inserting a multimeter, grounding pen, to facilitate user testing.
(6) the right modules can be customized according to the user\`s actual requirements. As the debugging process is tedious, it needs to be charged a certain amount of customization fee.
2 Module interface
The input / output interface takes two forms, one is the pin interface, and the other isSMAInterface. The interface of each module is shown in figure.
![](http://ae01.alicdn.com/kf/HTB1g4JPfBUSMeJjy1zjq6A0dXXa8.jpg)
Schematic diagram of module interface
3 Module interface connecting method
The module connection is shown below.
![](http://ae01.alicdn.com/kf/HTB18nLoiBcHL1JjSZJiq6AKcpXa9.jpg)
Connection diagram
Module debugging effect
This moduleDefault passband300Hz~3400Hz,gain0dBIn the case of,Input amplitude is1VppSine wave signal, the test data is shown below.
![](http://ae01.alicdn.com/kf/HTB1ifJFfrsTMeJjy1zcq6xAgXXau.jpg)
![](http://ae01.alicdn.com/kf/HTB1ezBwdWmWQ1JjSZPhq6xCJFXaM.jpg)
Amplitude frequency characteristic diagram