International Technology Roadmap for Semiconductors 2003の要求清浄度について － シリコンウエハ表面と雰囲気環境に要求される清浄度, 分析方法の現状について －

An RF-DC power conversion system is designed to efficiently convert far-field RF energy to DC voltages at very low received power and voltages. Passive rectifier circuits are designed in a 0.25 mum CMOS technology using floating gate transistors as rectifying diodes. The 36-stage rectifier can rectify input voltages as low as 50 mV with a voltage gain of 6.4 and operates with received power as low as 5.5 muW(22.6 dBm). Optimized for far field, the circuit operates at a distance of 44 m from a 4 W EIRP source. The high voltage range achieved at low load current make it ideal for use in passively powered sensor networks.

Efficient Far-Field Radio Frequency Energy Harvesting for Passively Powered Sensor Networks

The idea of wireless power transfer (WPT) has been around since the inception of electricity. In the late 19th century, Nikola Tesla described the freedom to transfer energy between two points without the need for a physical connection to a power source as an ?all-surpassing importance to man? [1]. A truly wireless device, capable of being remotely powered, not only allows the obvious freedom of movement but also enables devices to be more compact by removing the necessity of a large battery. Applications could leverage this reduction in size and weight to increase the feasibility of concepts such as paper-thin, flexible displays [2], contact-lens-based augmented reality [3], and smart dust [4], among traditional point-to-point power transfer applications. While several methods of wireless power have been introduced since Tesla?s work, including near-field magnetic resonance and inductive coupling, laser-based optical power transmission, and far-field RF/microwave energy transmission, only RF/microwave and laser-based systems are truly long-range methods. While optical power transmission certainly has merit, its mechanisms are outside of the scope of this article and will not be discussed.

Harvesting Wireless Power: Survey of Energy-Harvester Conversion Efficiency in Far-Field, Wireless Power Transfer Systems

More than a decade of research in the field of thermal, motion, vibration and electromagnetic radiation energy harvesting has yielded increasing power output and smaller embodiments. Power management circuits for rectification and DC–DC conversion are becoming able to efficiently convert the power from these energy harvesters. This paper summarizes recent energy harvesting results and their power management circuits.

/pdf/micropower-energy-harvesting-1l9ase94z1.pdf

Micropower energy harvesting

More than a decade of research in the field of thermal, motion, vibration and electromagnetic radiation energy harvesting has yielded increasing power output and smaller embodiments. Power management circuits for rectification and DC-DC conversion are becoming able to efficiently convert the power from these energy harvesters. This paper summarizes recent energy harvesting results and their power management circuits.

PURPOSE: To improve the communication quality of radio communication by evading the influence of radiation when the information and the radio communication device like a PC card are used while connected to each other CONSTITUTION: In the information processing part 104 of the information processor 101, its operation stop, the increase or decrease in its operation speed, etc, are controlled with control signals supplied from the radio communication device 102 through a signal electric transmission part 103 Thus, the operation of the information processor 101 is controlled according to the radio communicating operation of the radio communication device 102 to evade the influence of unnecessary radiation from the information processor 101 in the radio communication frequency band, thereby performing information communications meeting with desired radio communication requirements such as a signal-to-noise ratio and an error rate

Information processor, radio communication device used while connected to the processor, and radio communication system using these devices

A third-order intermodulation IM cancellation technique using a submixer is proposed for a low-power low-dis- tortion mixer. The IM cancellation is achieved by summing IM s generated in a main mixer and the submixer, which are almost the same amplitude and opposite phase. The mixer was designed to operate at 870 MHz. The proposed technique reduces IM by 18 dB with a current increase of about 15% and is suitable for low-power applications. The mixer achieved an input-referred third-order intercept point IIP of 10 dBm, a gain of 8.7 dB, and an NF of 9.8 dB and dissipates 30 mW from 2.9 V. The IC is fabricated in a SiGe bipolar transistor with 30 GHz.The IC occupies 1.44 mm 1.44 mm.

http://web.nchu.edu.tw/~ycchiang/RFIC/SiGe%20linear%20mixer.pdf

A 10-dBm IIP SiGe Mixer With IM Cancellation Technique

A mobility proportion current generator comprises a voltage adder including a first MOS transistor, the voltage adder adding a voltage whose temperature dependency is small with respect to the mobility and a threshold voltage of the first MOS transistor to output a sum voltage, and a second MOS transistor including whose drain terminal is connected to a constant potential point, the sum voltage of the voltage adder being applied between the gate terminal and the source terminal of the second MOS transistor to output a current proportional to the mobility being output from the drain terminal thereof.

Mobility proportion current generator, and bias generator and amplifier using the same

PROBLEM TO BE SOLVED: To rise power of a power transmission device while suppressing loss to a low level.SOLUTION: A wireless power transmission control device according to an aspect of the present invention comprises: an input part; an output part; and a wireless power transmission control part. The input part receives a first power information item representing power transmitted by a power transmission device. The input part receives a second power information item representing power received by a power reception device. The output part outputs a first control signal configured to instruct a power transmission voltage of the power transmission device. The output part outputs a second control signal configured to instruct an impedance of the power reception device. The wireless power transmission control part generates the second control signal such that a difference between the first power information item and the second power information item becomes small, and generates the first control signal such that a difference between the first power information item and a first target value becomes small, or a difference between the second power information item and the second target value becomes small.

Wireless power transmission control device, power transmission device, power reception device, and wireless power transmission system

PROBLEM TO BE SOLVED: To provide compact and simple composite system sharing radio equipment, capable of facilitating countermeasures to a system whose modulation system, transmission speed, access system, radio frequency, and signal band is different. SOLUTION: The output of a first synthesizer 1316 is supplied to a pair of mixers 1307 for down-converting an RF signal into a base-band signal, a pair of mixers 1309 for up-converting the base-band signal into an RF signal, a mixer 1308 for down-converting the RF signal into an intermediate frequency signal, and a mixer 1310 for up-converting the intermediate frequency signal into the RF signal, so that it is possible to facilitate coping with a plurality of radio frequency, while making a synthesizer common. COPYRIGHT: (C)2003,JPO

Shoji Otaka

Papers

Information processor, radio communication device used while connected to the processor, and radio communication system using these devices

A 10-dBm IIP SiGe Mixer With IM Cancellation Technique

Mobility proportion current generator, and bias generator and amplifier using the same

Wireless power transmission control device, power transmission device, power reception device, and wireless power transmission system

Composite system sharing terminal