Reliable wireless communication for industry 4.0

  Copyright: RWTH IAS

Latest generation of the multi-standard, triple-band transceiver developed at IAS



Treufunk stands for reliable communication for industry 4.0 and IoT. For this a multi band transmitter is developed for the ISM Bands 433MHz, 800-930MHz and 2.4GHz.



Chipfoto Copyright: RWTH IAS



Markus Scholl

Research Assistant


+49 241 80-20155



In the project Treufunk, IAS develops a multi-band low power transceiver for industry 4.0 and IoT applications. Particular importance is set to the reliability of communication. Therefore, the possibility to send the data stream in the three ISM frequency bands 433MHz, 800-930MHz, 2.4GHz is implemented. As a result, data transmission is still possible when two of the three bands are disturbed. A sleep mode and a wake-up receiver are also implemented for low current consumption. The on-chip PLL and the integrated LDOs reduce the required external components to a minimum.

The picture shows the block diagram of the entire system. The upper part depicts the receive path. It consists of the Wake Up receiver for the 2.4GHz band, which wakes up the chip out of the sleep mode when a signal is received. Below, the receive path for the data is depicted. The input signals of the three bands are mixed down and converted into a digital signal by a delta sigma converter. The lower part shows the Rx path and the on chip PLL. The data is modulated by a two-point modulation and sent by the three power amplifiers on the respective band.

Picture of the demonstrator whith a hovering sphere. Copyright: RWTH IAS

For the project, a demonstrator was developed that can levitate a magnetic ball . The sphere is held here by a magnet in the upper part of the arm. A Hall sensor in the wooden foot measures the position of the ball, which is evaluated by a microcontroller. The control loop is closed via a radio link from the foot to the board in the arm. For data transmission, the transceiver developed by IAS is used.

The system has some requirements for the control. The strongest limitation for wireless control is undoubtedly the low tolerance to the delay between transmit and receive. The transceiver developed at IAS manages to meet the high demands and to enable a stable regulation.
In addition, another feature of the transceiver can be demonstrated: By transmitting the data across all three supported frequency bands, susceptibility to jamming is greatly reduced. The control works reliably even with high radio traffic in some of these three bands (for example, strong data transmissions via WLAN) and even after unscrewing individual antennas, the
ball remains stable.

Video of the demonstrator
  Block Diagram Copyright: RWTH IAS