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A 90nm CMOS UHF/UWB asymmetric transceiver for RFID readers

A 90nm CMOS UHF/UWB asymmetric transceiver for RFID readers,10.1109/ESSCIRC.2011.6044894,Jia Mao,M. David Sarmiento,Qin Zhou,Jian Chen,Peng Wang,Zhuo

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A 90nm CMOS UHF/UWB asymmetric transceiver for RFID readers  
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This paper presents an integrated asymmetric transceiver in 90nm CMOS technology for RFID reader. The proposed reader uses UHF transmitter to power up and inventory the tags. In the reverse link, a non-coherent Ultra-wide Band (UWB) receiver is deployed for data reception with high throughput and ranging capability. The transmitter delivers 160 kb/s ASK modulated data by an integrated modulator and a Digital Controlled Oscillator (DCO) in UHF band with 11% tuning range. The DCO consume 6 mW with 0.12 mm 2 area. On the other side, adopting two integration channels, the 3-5 GHz energy detection receiver supports maximum 33 Mb/s data rate both in OOK and PPM modulations. The receiver front-end provides 59 dB voltage gain and 8.5 dB noise figure (NF). Measurement results shows that the receiver achieves an input sensitivity of -79 dBm at 10 Mb/s, with power consumption of 15.5 mW. I. INTRODUCTION Nowadays, more and more applications are implemented with the Radio Frequency Identification (RFID) technology or smart wireless sensor network (WSN), such as product tracking, environment sensing, monitoring and positioning. Passive RFID systems or Single-hop centralized sensor networks are considered to be a typical and versatile method of implementing this idea (1). However, the conventional passive UHF RFID system is suffering from several drawbacks. It is sensitive to interference, multi-path fading and collision problem because of the narrow band signal. It is also difficult to provide high range resolution for accuracy positioning. Moreover, due to the backscattering and load modulation, existing data rate of the passive UHF RFID tags is limited to a few hundreds of kb/s, which is insufficient for large loaded sensor tags. In order to address these problems, a passive RFID system with an asymmetric wireless link has been proposed (2). Impulse Radio Ultra Wideband (IR-UWB) is introduced for uplink communication from reader to tags, while conventional UHF is applied to power up and inventory the tags. Such approach takes full benefits of the UWB transmission, such as low power consumption of the simplified transmitter, accurate ranging and positioning capability and robust wide band link allowing high throughput. On the other hand, it relaxes the tag design by pushing the complex and power hungry UWB receiver to the reader side. Based on this asymmetric architecture, a remote-powered UHF/UWB passive tag has been developed (3). In order to pair the tags for demonstrating the system concept, an asymmetric UHF/UWB reader is designed in this work. It contains a UHF transmitter and an energy detection (ED) IR-UWB receiver. The UHF transmitter with 160kb/s data rate is implemented using Amplitude-Shift-Keying (ASK) modulation. The IR-UWB receiver supports on-off- keying (OOK) and pulse position modulation (PPM) with data rate up to 33 Mb/s. The transceiver is fabricated in 90 nm CMOS technology. The chip area is 1.72 mm 2
Conference: Solid-State Circuits European Conference - ESSCIRC , pp. 179-182, 2011
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