Vs (~ Vin R₁ С1 C2 R2 G Vout
In one version of this circuit (see image added), C1 and C2 have the same value as each other. Let this value be C. R2 is twice the value of R1. If we let the value of R1 be R, the equation for the 3 dB cut-off frequency is the same as for the low-pass filter, that is:
A typical design process for the high-pass filter is similar to the low-pass filter: choose a value for R and hence work out other component values to give a desired cut-off frequency.
Another feature of Sallen and Key filters is that multiple filters can be cascaded to create higher-order filters, or bandpass or bandstop filters. In this part of the question, you should design a bandpass filter that uses cascaded Sallen and Key filters. The lower cut-off frequency should be 10 kHz and the upper cut-off frequency should be 100 kHz.
Briefly explain how a bandpass filter can be made by combining Sallen and Key filters as required. Include a diagram or diagrams (but not circuit diagrams) to give an overview of an arrangement of filters that support your explanation.
Give a calculation or calculations to show component values required in your bandpass design. Do not repeat any calculations you might have done earlier in this question but refer to them.
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