Finally, NEC Corporation and NEC Electronics Corporation have succeeded in developing fundamental technologies for intellectual property (IP) cores used in wireless transceivers. The new technology embedded with IP cores into system LSIs for wireless systems. The new IP is facilitated with CMOS technology scaling of such LSIs.
The new IP cores will reduces system costs and power consumption for next generation wireless technology solutions used in ubiquitous networks, which can only be realized by wireless IP digitization. The enhancement of CMOS technology accelerates device operation and reduces the thermal noise generated in transistors. Thus it promotes the implementation of wireless circuits by digital CMOS devices. However, power reduction and suppression of RF signal degradation by process variation, which is actualized with CMOS scaling are required to enhance popularization of wireless device.
The new digital RF technology enables further advancement of wireless circuit digitization through direct RF signal synthesis from digital data and final digital control of signal processing frequency and introduces discrete-time signal processing. The new RF technology enables LSI technology scaling and tunes after chip fabrication. The features of new IP cores are given below:
1) The new technology combines multiple digital signals with various phases and amplitudes realizes lower distortion of radio frequency (RF) signals. When this technology is applied to transmitter modulators and power amplifiers in a wireless IP core, it eliminates the need of expensive external components to reduce output signal distortion, which reduces total cost of system for wireless transceiver systems. In addition, the new technology cuts the periods of wireless IP design as well as enables the fine tuning of wireless IP, even after chip fabrication, through optimization of the RF signal distortion that can be achieved by controlling the digital signal phase.
2) The new technology IP cores enables direct modulation of digital data by comparing the sampled RF signals received in wireless IP core and technology to vary sampling frequency according to the wireless communication environment. It adapts the communication environment Test chip evaluation.
Via: Japan Corp
