Fixed Frequency High/low Pass Filter Module:

- 2nd/3rd Order Butterworth, Chebychev or Bessel Responses

This module is a Sallen and Key circuit configuration filter with unity gain in the pass-band. It can be used to realise 3rd order low or high pass filters up to 100kHz and 2nd order low-pass filters up to 1MHz with appropriate choice of op-amp. When used as a 2nd order low-pass filter, the 1st R-C stage can be used as a 1st order “roofing” filter to prevent high frequency components getting into the op-amp which are beyond its capability to suppress.

The module can be purchased ready built to the customers own specification. Contact us by phone or e-mail to discuss your filtering requirements. We will help you with the selection of the right filter for your application and if we think we can make the filter you need we will provide an estimated cost and delivery time. Alternatively, fill in and submit the following form and we'll get back to you.

Features

  • Uses a standard SOT23-5 surface mount op-amp, giving a wide and growing choice from low power to high bandwidth / slew rate.
  • Cascadable to form higher order filters when used as 2nd order building blocks (not recommended beyond 6th order with the Sallen & Key realisation)
Fixed Frequency High/low Pass Filter Module - 2nd/3rd order

Applications

  • Anti-aliasing filter on its own or in conjunction with a higher order switched capacitor filter - for example, our module based on the LTC 1569, 10th order, low-pass, switched capacitor filter chip.
  • Reconstruction filter following a digital filter or a switched capacitor filter.

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Price: £15.00 per module

 

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