NTT Corporation has achieved a world’s first in applying a neutralization circuit to an amplifier circuit in the 500 GHz band by using an inductor component to neutralize the transistor’s parasitic capacitance that limits amplifier frequency. With this technology, NTT has successfully achieved a 20 dB high-gain amplifier IC in the 500 GHz band. technology and Accuracy Of Weather
The 500 GHz band is a high-frequency band known as terahertz waves that is expected to have application to sensing and other fields. To use such a frequency band with frequencies higher than those of microwaves and millimeter waves, the development of a high-gain amplifier IC has been anticipated.
NTT has achieved a 500 GHz band amplifier IC applying original neutralization circuit technology using an InP based HEMT and has confirmed a power amplification factor (gain) of 20 dB, which is 2.5 times greater than currently reported gain in 500 GHz band amplifiers. This technology is therefore expected to help improve the accuracy of weather forecasting for extreme events such as typhoons and torrential rain.
1.BACKGROUND TO RESEARCH
Terahertz waves that include the 500 GHz band constitute a frequency band that exhibits little interference with other systems or natural radiation. This band features electrical characteristics that enable accurate determination of water vapor, oxygen concentrations, etc., so applying it in addition to the frequencies (7 GHz – 80 GHz) currently being used in meteorological observations is expected to improve the accuracy of weather forecasting such as for typhoons and torrential rain.
2.RESEARCH RESULT technology and Accuracy Of Weather
This research has achieved a 500 GHz band amplifier IC applying original neutralization circuit technology using an InP-HEMT and has successfully achieved a 20 dB high-gain amplifier IC. This is 2.5 times the gain reported so far for 500 GHz band amplifier ICs, which makes this a promising technology for improving the accuracy of weather forecasting especially for extreme events such as typhoons and torrential rain.
This amplifier IC can perform signal amplification with a high gain of 20 dB in the 500 GHz band, which up to now has been difficult to achieve anywhere in the world. In this capacity, we expect it to find application in a variety of fields such as imaging and large-capacity wireless communications in addition to sensing. Going forward, the deepening of this technology will contribute to the advancement of science and technology that can make everyone’s life safer and more secure, more prosperous, and more convenient while giving hope for the future of mankind.