NEC Develops Next-Gen UWB Wireless Transceiver Technology
NEC today announced that it has succeeded in developing the world's first reliable signal creation and processing technology in the wireless 3- to 9-gigahertz wide bandwidth range, enabling high-speed wireless transmission of data from computers and digital home appliances.
Features of the ultra wideband (UWB) transceiver technology:
- Development of ultra-wide range compensation circuit technology, which is capable of stable signal creation and processing across a wide spectrum of frequencies (3-9 GHz)
- Development of ultra low-power supply voltage amplifier technology
- Development of new technology to compensate for characteristic variation in transistors that use low power
- Use of a 90-nanometer (nm) advanced CMOS process for high-frequency operation (note 1*)
To realize the wide spectrum of frequencies, NEC developed an oscillator that can generate signals in the 3-9 GHz range. In addition, an ultra-high-speed gain amplifier and band-pass filter have been added into the oscillator to change the gain in accordance with fast band hopping, achieving a flat characteristic output in the 3-9 GHz band. Low-supply voltage amp requires especially high signal-to-noise (S/N) ratio. This new development introduces a new amp that achieves high performance for both large amplitude and noise rejection simultaneously. To date, variation-compensation circuits have had a voltage-adjustment circuit to compensate for distortion in each individual circuit. This new development instead places one voltage-adjustment circuit on a chip and uses a bus to distribute compensation voltages, drastically reducing the amount of power needed for variation correction.
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