Hirotsugu Kajihara

A −70dBm-sensitivity 522Mbps 0.19nJ/bit-TX 0.43nJ/bit-RX transceiver for TransferJet™ SoC in 65nm CMOS

TransferJet™ is an emerging high-speed close-proximity wireless communication standard, which enables a data transfer of up to 522Mbps within a few centimeters range. We have developed a fully integrated TransferJet SoC with a 4.48-GHz operating frequency and a 560-MHz bandwidth (BW) using 65nm CMOS technology. Baseband filtering techniques for both a transmitter (TX) and a receiver (RX) are proposed to obtain a sensitivity of -70dBm with low power consumption. The SoC achieves an energy per bit of 0.19nJ/bit and 0.43nJ/bit for the TX and the RX, respectively, We have also built the worlds smallest module prototype using the SoC, which is suitable for small mobile devices.

A 7uW deep-sleep, ultra low-power WLAN baseband LSI for mobile applications

Low power IEEE 802.11n single input single output (SISO) wireless LAN (WLAN) baseband LSI has been developed for mobile applications. The multiple low power technologies such as on-chip power gating and high throughput technologies for expanding idle time are applied to the LSI. By minimizing always-on circuits and implementing them using thick gate-oxide transistors, 7uW stand-by power consumption is achieved with negligible shutdown/restart transition time. The built-in wake-up timer and on-chip CPU enables continuous transmit/receive operation without an external intervention.