A fully integrated RSSI and an ultra-low power SAR ADC for 5.8 GHz DSRC ETC transceiver

Abstract

This study presents a monolithic received signal strength indicator (RSSI) and an ultra-low power SAR ADC for 5.8GHz DSRC transceiver in China electronic toll collection systems. In order to meet the stringent requirement of wide input range for the transceiver, two RSSIs collaborate with auxiliary ADC circuits to provide the digitalized received signal strength to the digital baseband of a transceiver. The RSSI design achieves fast transient response, low power consumption, and a small die area with internal active low-pass filters instead of external passive ones. The proposed design has been fabricated using a 0.13µm 2P6M CMOS technology. Measurement results show that the overall input dynamic range is 86dB with an accuracy of ±1.72dB and a transient response of less than 2µs. Compared with the state-of-the-art designs in the literature, the overall input range and transient settling time are improved by at least 14.6%, and 300%, respectively.

Analysis of the Influence of the Front Vehicle on the Propagation Loss of ETC System of the Back Vehicle

“…ELECTRONIC toll collection (ETC) system is an essential application of intelligent transportation system(ITS) and has been widely adopted in the highway, housing estates, and parking lots [1]- [5]. An ETC system consists of road-side units (RSU), on-board units (OBU) installed on the windshield of vehicles, and a cost accounting subsystem operating in the background [6], [7]. RSU connects to OBU (read or write information) through 5.8 GHz wireless communication technology called Dedicated Short Range Communication (DSRC) [8]- [10].…”

Linear-in-dB Logarithmic Signal Strength Sensor Circuit for Wireless Power Transfer Receivers

“…In reference [6], an RSSI system is used for the collection of tolls by integrating it with a unit on board. The design incorporates a mixture of rectifiers and amplifiers (limiting in nature); the filter is integrated into the chip using active components, and the output currents are combined through summation.…”