Teledyne Scientific & Imaging and test instrument maker Teledyne LeCroy of of Chestnut Ridge, NY, USA (a subsidiary of Teledyne Technologies Inc) say that researchers at the Microwave Electronics Lab at Chalmers University of Technology in Sweden have achieved a record D-band wireless communication signal transmission speeds, with a data rate of 44Gbps doubling the previous record.
Advances in wireless transmission further reduce the need for long cables, and enable the delivery of high-resolution video to users without the delays inherent iin wired networks.
The experiment was conducted using a Tx/Rx chipset developed by researchers at Chalmers University, using Teledyne Scientific's indium phosphide (InP)-based double heterojunction bipolar transistor (DHBT) technology and Teledyne LeCroy's LabMaster 10 Zi oscilloscope. Results of the experiment were published at the 2014 IEEE Compound Semiconductor Integrated Circuits Symposium (CSICS) in San Diego last October.
"The Teledyne indium phosphide DHBT-MMIC process plays a vital role in our program due to the wide bandwidths that can be achieved in the circuits," says professor Herbert Zirath, leader of the Chalmers research program, which is supported by the Swedish Foundation for Strategic Research (SSF). "We could not have set the record without this process, and more recently we have pushed the record out to 48Gbps," he adds. "The goal of our program is to reach 100Gbps, and we plan on using additional Teledyne LeCroy equipment to analyze receiver outputs in the next phase of our research."
The Tx/Rx chipset was designed in Teledyne Scientific's ultra-high-speed InP DHBT technology, which features a minimum feature size of 250nm and has demonstrated record RF performance with higher breakdown voltage and dynamic range than can be obtained using competing silicon technologies. The demonstration was the first implementation of an InP DHBT chipset for D-band data transmission. The chipset was developed specifically for point-to-point wireless communications, including D-band, 4G and 5G markets.
To view and analyze the demodulated QPSK signal, Teledyne LeCroy LabMaster 10 Zi oscilloscopes were used, including the 65GHz LabMaster 10-65Zi. The oscilloscope's serial data analysis capability was used to analyze the demodulated I & Q signals, especially the eye diagrams, and to apply equalization and predict the BER (bit-error rate) performance at 44Gbps. The LabMaster 10 Zi platform's bandwidth and 130fs channel matching is key to the acquisition and analysis of I and Q signals from coherent optical receivers.
