The importance of high-end sensors increases in automotive industry where more intelligent controls are needed for almost every aspect of the vehicle performance. Furthermore, (low-power) wireless sensor networks become more integrated in our daily live to create a 'smart' environment. Sensor interfaces are needed to amplify sensor output signals and transform them to a digital value. Traditionally, this is done by an analog amplification chain and an analog-to-digital converter. Both low power constraints and the economical drive to go towards smaller technologies motivate the need for new architectures. Since analog circuits don't scale as easily as digital circuits do, these architectures are mainly digitally oriented. Furthermore due to the fact that time-resolution improves in smaller technologies, this research focuses on digital oriented sensor interface architectures which transform the signal into a time/frequency-based signal.