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| Design and Simulation of Composite Operational Amplifier Based Active Band Pass Filter for Ultra-High Frequency Rfid Systems
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Atsuwe , B.A. and Mom, J.M.
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Abstract:
The radio frequency identification (RFID) systems reader is mainly made up of a bandpass filter, an amplifier, a rectifier, low pass filter and a comparator. In today's world the RFID plays a vital role in communications and technology and in all forms of electrical equipment. RFID works in the low frequency (30-500 kHz) band, high frequency (10-15MHz) band, ultra-high frequency (860-960MHz) band and super high frequency (2.4-5.8GHz) band. This paper presents the design and simulation of active bandpass filter utilizing the composite operational amplifier (op. amp) for Ultra high frequency RFID systems. This filter helps to achieve an improvement over single op.amp in terms of extended useful bandwidth, low sensitivity to components, op.amp mismatch and wide dynamic range which suits its application in the ultra-high frequency (UHF) RFID usage. Results presented shows through the magnitude plot by NI Multisim software that the active bandpass filter works to specification using the electronic product code (EPC) class 1 generation 2 protocols for RFID usage. Since the centre frequencies fo =40kHz to fo=640kHz which are the backscatter frequencies for UHF range are accommodated. Also the other filter parameters like: Gain, Roll-off rate, bandwidth, sensitivity are all in agreement with theory, which informs the conclusion that the filter performs well and can be deployed in the UHF RFID systems
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