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In this paper, an active fourth order band-pass filter for RFID reader is designed and simulated. An active band-pass filter is required for the front-end system because all signals outside the (10-20) kHz time-varying signal backscattered by the tag need to be rejected. The filter is constructed from some given specifications, one of which is, that the filter needs to have a Butterworth response. The architecture that will be used is the Sallen-Key. The values for the passive components are calculated, and the circuits are then simulated with Circuit Maker to reach the final conclusion which will describe the results of the simulations compared to MATLAB simulation results.
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