Thesis Sensor Interface Circuits

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This implementation exhibits greatly reduced chargefeedthrough, and circuit behaviour is in accordance with a modification to the firstorder analysis that includes the effects of chargefeedthrough.

Importantly, no frequency locking and much reduced jitter is observed.

The main motivation being: to realize simple frontends for capacitive sensors and microsystems for integration in high-density sensing applications, for example, in arrays of sensors for highresolution ultrasound imaging.

In addition, there are many applications where a high accuracy in sensing is not essential; in such cases, a simple interface circuit can not only save the design time, but may also offer area and power advantages over the more complex circuits.

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The first interface circuit is the realization of a current-mode approach that has the main advantage of being able to produce a fully-differential output also from a single-ended sensor by using just a fixed reference capacitor.

The circuit, prototyped in a commercial 0.8-µm CMOS process, was estimated capable of achieving an accuracy of around 0.2% relative to full-scale which may be sufficient in many applications.

In addition, parasitic induced jitter and frequency locking are identified as a second source of error.

The three interface circuits are implemented as an integrated circuit using the European Silicon Structures (ES2) ASIC CMOS process, with a modification to permit the inclusion of fullcustom designed, chargefeedthrough compensated switches.


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