A 0.5-V 5.8-GHz low-power asymmetrical QPSK/OOK transceiver for wireless sensor network

Abstract

This paper presents design of the low power RF transceiver [1] which is suitable for wireless sensor network. Using 5.8 GHz band has potentiality to achieve small size wireless sensor module because of smaller antenna in higher frequency. The proposed transceiver utilizes different modulation schemes for uplink and downlink to optimize power consumption and spectral efficiency. In addition, supply voltage of 0.5V can reduce the power consumption of overall RF transceiver. The prototype transceiver was fabricated in 65nm CMOS process, and the transmitter achieved EVM of 12.6% while consuming 2.86mW, and the receiver realizes sensitivity of -75dBm while consuming 0.83mW. I. INTRODUCTIONWireless sensor network (WSN) has recently drawn big attention because it can achieve safe and reliable society. To construct WSN, wireless sensor nodes featuring ultra-low-power consumption and small size are required. The former is to reduce the cost of battery exchanges, and the latter is to arrange a lot of modules in required field. Using higher frequency-band is suitable for small size module because of smaller antenna, however, this causes higher power consumption. Low-voltage power supply is a common approach to reduce power consumption [2], however, it is quite difficult to achieve low voltage operation in the RF transceiver because of the decreasing maximum operation frequency, SNR, and voltage headroom. In addition, the system planning which allows low power consumption of each module is also important.Thus, we have proposed a 0.5-V 5.8-GHz ultra-low-power asymmetrical RF transceiver in the literature [1], and this paper presents the design of it. The detail of the proposed transceiver is shown in sec.II. Measured results are shown and discussed in sec.III, and this paper is concluded in sec.IV.

Asic Design of RF Energy Harvester Using 0.13UM CMOS Technology

“…Ikeda et. al [22] have proposed Wireless Sensor Network node that operates on 0.5V and consumes 830 µW at a data rate of 300kbps. If the node is adjusted for lower data rates, it consumes less power.…”