Ever noticed the Segway personal mobility device, that’s illustrated here? This mobility system appears to perform an impossible task. It can support an adult on a platform suspended between two parallel wheels and is capable of accelerating to 15km/h. It manages to maintain balance and offers a highly intuitive speed and direction control system. All the magic here is performed by a tri-axis gyroscope based control system.

ICsense conceived and designed the gyroscope interface system which comprises a high voltage MEMS driver circuit and precision angular rate detection circuits. To ensure the MEMS sensor operates in its resonant mode, the driver system can be tuned with a 12-bit precision and is capable of achieving sub-Hertz tuning accuracy – ultimately leading to the highly stable control system for which this transporter is known.

ICsense’s expertise in gyroscope MEMS

  • Low noise switched capacitor gain stages
  • Precision band pass filters
  • Quadrature compensator
  • 12-bit precision, micro power analog to digital conversion


For a consumer tri-axis accelerometer digitization ASIC project in 0.18 micron CMOS, a complete design study was carried out to model a fully integrated signal path solution for the MEMS readout system. The project lead to the design of a state-of-the-art sensor architecture

ICsense’s expertise in accelerometer MEMS

  • Micro power operation below 100µA
  • Sensor nominal capacitance 400fF with 10fF/g dynamic variation (±2g to ±16g programmable)
  • 1% accuracy over consumer temperature range
  • On-chip parasitic capacitance compensation (up to 1.2pF)


A distinct strength of ICsense is integrating sensor interfaces and actuation circuitry for MEMS sensors. An excellent example of this is a precision fully integrated magnetic Hall sensor ASIC we developed. From project start, we contributed to the development of the Hall sense elements, enabling the trade-off of key parameters including area, structure and sensitivity. To reduce inherent offset, we implemented a layout of four Hall plates with 90° current direction exploiting current spinning (i.e. Spin Hall effect). The sensor signal chain consists of low-offset, low-noise amplifiers followed by precision voltage to current conversion. The ADC is a 15-bit extended counting delta-sigma design with an equivalent per LSB current of 1.4nA – equating to a 0.4 micro Tesla minimum system resolution.

ICsense’s expertise in magnetic MEMS

  • Quad Hall sensor integration with 90° (quadrature) current direction
  • Exploits the Spin Hall Effect (SHE)
  • Low-offset, low-noise instrumentation signal path
  • 15-bit extended counting delta sigma ADC
  • System sensitivity of 0.4µT/LSB
  • Offset < 6mTRMS noise of less than 0.5µT (rms) with a current of a few 100µA
  • 0.18µm CMOS process
  • Industrial temperature range -40 to 85ºC