Researchers reduce chip for full duplex transmit and receive data

Apr

16

2016

Researchers at Columbia University have managed to double the capacity of sending and receiving data over the same radio frequency. The data were sent while full duplex. The investigators were able to integrate the required circulator on the chip.

One year ago, received researchers from the same group of the al for each other to transmit data over the same frequency at the same time and to be received. Now, it is succeeded in the same group to reduce the whole and only one antenna for transmission and reception to be used.

In order to be able to receive both signals on a single chip, have to be made ​​use of a circulator . In general, a circulator is made of a magnetic material, which makes integration difficult. It is therefore now the researchers succeeded in obtaining a circulator on a CMOS without the need for magnetic material.

A circulator must Lorentz reciprocity interrupt or reciprocity. The reciprocity principle describes the interaction between electromagnetic devices, for example, two antenna systems. Phd student Negar Reiskarimian developed the circuit in CMOS. On Eurekalert says he that the purpose of the group was to develop a simple and effective way to conventional materials, in order to interrupt Lorentz reciprocity. The circulator at the nanoscale also had to be processed on a chip.

Together with the team of the Columbia University has developed a small Reiskarimian circulator that uses the circuitry to send around the signal via a set of capacitors. For example, the non-reciprocal ‘twist’ of the signal must, which is present in magnetic materials, be emulated. To demonstrate that they had it right, the researchers built a prototype of a full-duplex system in silicon. They demonstrated this system at the IEEE International Solid State Circuits Conference in February.

There is great demand for this kind of circuits because it can potentially double compared to the half-duplex systems which use the most current wireless networks, network capacity.

The research article published Thursday in Nature Communications.

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