Abstract
This paper presents an automatic gain control (AGC) circuit which is used in a single-chip UHF RFID reader transceiver system. The VGA is a fully differential circuit with differential output swing of 1-Vpp. The gain of the two VGAs can be varied linearly from 0dB to 60dB with respect to a control voltage from 0.28V to 0.93V. The exponential voltage to current (V-I) convertor is based on Taylor’s series expansion. The AGC circuit consumes 4.5mA current and has a 2.7MHz 3-dB bandwidth when the gain is 60dB. A differential positive peak detector is used in the AGC circuit loop. The AGC circuit is based on UMC 0.18-μm single-poly six-metal CMOS process technology.
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© 2011 Springer-Verlag Berlin Heidelberg
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Wenbo, W., Luhong, M., Xindong, X., Yan, C., Shilin, Z., Sheng, X. (2011). An Automatic Gain Control Circuit for a Single-Chip UHF RFID Reader Transceiver. In: Zheng, D. (eds) Advances in Electrical Engineering and Electrical Machines. Lecture Notes in Electrical Engineering, vol 134. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25905-0_18
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DOI: https://doi.org/10.1007/978-3-642-25905-0_18
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