Fixed Frequency High/Low/Band Pass Filter Module:

- 4th to 8th Order Butterworth, Chebyshev or Bessel Responses

This module includes 4 single amplifier blocks which could be configured to provide up to 4 bi-quadratic, low-pass or high-pass, filter stages. Each stage is realised in Sallen and Key circuit configuration. The 1st block is preceded by a passive R-C stage which can be used as a 1st order “roofing” filter to prevent high frequency components from entering the op-amp. Additionally, the passive RC stage could be used to make the overall filter an odd order. Stages not being used for filtering can be used as buffers/gain stages.

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 standard 14-pin quad op-amp. giving wide choice of, for example, low power, low noise, rail-to-rail input / output or high bandwidth.
  • Provision for accurate determination of DC gain on the last stage to combat sensitivity of Q to stage gain errors in higher Q stages realised with the Sallen and Key circuit topology. Please note that due to the above sensitivity, we recommend confining low-pass and high-pass filters no more than 6th order (with this Sallen and Key topology) for Chebyshev, 7th order for Butterworth and 8th order for Linear Phase. Band-Pass filters are limited to 1x4th order per module.
Fixed Frequency High/Low/Band Pass Filter Module - 4th to 8th order

Applications

• Anti-aliasing filter on its own or in conjunction with a tuneable 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.
• Audio
• Instrumentation

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Price:£40.00 per module

 

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