Toshiba's Spur Canceled Clock Generator Recovers Receiver Sensitivity in Wireless SoCs

TOKYO — (BUSINESS WIRE) — June 14, 2016Toshiba Corporation (TOKYO:6502) has developed a spur canceled clock generator (SCCG) that recovers receiver sensitivity of wireless connectivity IC. The SCCG recovers receiver sensitivity by suppressing the spur, interference that originates from the clock signal, and achieves receiver sensitivity of -93 dBm for all channels in Bluetooth® Smart ICs. Toshiba will announce this advance at VLSI Circuits Symposium 2016, the international conference on semiconductor devices held in Honolulu, Hawaii on June 15.

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Circuit diagram of wireless connectivity IC (Graphic: Business Wire)

Circuit diagram of wireless connectivity IC (Graphic: Business Wire)

Recent wireless connectivity ICs integrate analog blocks, such as RF circuits, digital blocks, and mixed signal blocks, such as AD converters, on one chip. However, some of the harmonics of the reference clock signal for AD converters and digital circuits, known as clock spurs, degrade receiver sensitivity. Conventional techniques to recover sensitivity have resulted in issues with additional power consumption, chip size and development costs.

Toshiba’s solution is a clock generator that suppresses spur by delaying some parts of the clock. This clock delay generates two kinds of clock spurs that have reverse phase with the same amplitude, which cancel each other out. Since the generator’s power consumption is 18μW and the size is 40μm×120μm, clock spur is suppressed without any increase in power consumption or size. This approach recovers 4dB of sensitivity degraded by the spur, and applied to Bluetooth® Smart IC achieves -93dBm receiver sensitivity.

The spread of such applications as wearable devices is boosting demand for wireless connectivity ICs. Toshiba will proactively continue to expand its line-up of high performance wireless ICs, and plans to launch a Bluetooth® Smart IC with the SCCG this summer.

* Bluetooth is a registered trademark owned by the Bluetooth SIG; Toshiba uses them under license.

About Toshiba
Toshiba Corporation, a Fortune Global 500 company, channels world-class capabilities in advanced electronic and electrical product and systems into three focus business fields: Energy that sustains everyday life, that is cleaner and safer; Infrastructure that sustains quality of life; and Storage that sustains the advanced information society. Guided by the principles of The Basic Commitment of the Toshiba Group, “Committed to People, Committed to the Future”, Toshiba promotes global operations and is contributing to the realization of a world where generations to come can live better lives.

Founded in Tokyo in 1875, today’s Toshiba is at the heart of a global network of 550 consolidated companies employing 188,000 people worldwide, with annual sales surpassing 5.6 trillion yen (US$50 billion). (As of March 31, 2016.)
To find out more about Toshiba, visit www.toshiba.co.jp/index.htm



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Toshiba Corporation
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Koichi Tanaka / Kota Yamaji
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