A 6 Gb/s 6 pJ/b 5 mm-Distance Non-Contact Interface for Modular Smartphones Using Two-Fold Transmission Line Coupler and High EMC Tolerant Pulse Transceiver

作者：Kosuge Atsutake^*; Kadomoto Junichiro; Kuroda Tadahiro

来源：IEEE Journal of Solid-State Circuits, 2016, 51(6): 1446-1456.

DOI：10.1109/JSSC.2016.2539339

• CDR
• coupler
• electromagnetic compatibility (EMC)
• MIPI
• noise
• non-contact interface
• transceiver
• wireless communication

A non-contact interface for modular smartphones that can provide a data connection at a maximum MIPI rate of 6 Gb/s has been developed. A two-fold transmission line coupler, which is a small-size coupler that has a wide bandwidth, is proposed for modular smartphones, where the layout area is strictly limited. The coupler size is 6 mm(2) for a 5 mm communication distance, which is 1/24 smaller than the conventional coupler. Since many wireless communication components, such as LTE, WiFi, and GPS transceivers, are assembled in a small module, the interference between the non-contact interface and the wireless transceivers should be suppressed. To improve noise immunity and reduce unwanted radiation from the coupler, an electromagnetic-compatibility robust pulse transceiver is proposed. A synchronous receiver using an edge counting clock recovery circuit improves noise immunity, and a bi-phase pulse transmitter reduces noise radiation in the GPS band. There is no EMS by LTE or WiFi signals on the data connection at BER < 10(-12) when the coupler is separated by a distance of 2 mm and no EMI on GPS signals at a separation of 10 mm. Compared with the state-of-the-art result, the highest energy efficiency (6 pJ/b) and space efficiency (1.2 mm(2)/1 mm distance) is achieved.

• 出版日期2016-6