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摘要
En 中文
Down converting mixing circuits are essential components of every radio-frequency receiver. A state of the art down conversion mixing system is expected to operate at low supply voltage and to fulfill at least three requirements. It has to eliminate the DC and low frequency components arising from self-jammer signal either in the mixing circuitry or in the connection to next signal processing stage. It has to provide minimum setting time in case of change of DC and/or low frequency components during operation or at power-up. The mixing stage has also to provide an optimal compromise among the allowed input signal dynamic range, noise properties of the system and minimum supply voltage. To fulfill these requirements and thus design down-conversion mixing stage suitable for battery supplied digital radio systems as well as UHF RFID readers a topology of mixing system employing close loop current sink load stage was developed. The comparison to classical topology employing resistor load is given in section 2. Then special advantages of the proposed topology are highlighted with respect to improved input signal dynamic range, adaptability to different link frequencies and the possibility to employ methods to speed-up the settling of the system. The usefulness of proposed improvements for RFID readers operating on EPC Gen2 standard was proven in praxis.
Keyword:
RF conversion mixer
active feedback
integrated circuit
RFID
期刊
I
IF:
0.8
论文数:
14
被引数:
171
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