A Configurable Interface for Analog Sensor Outputs

Reading out analog sensor outputs can be a challenging task at low frequencies because of the frequency noise. To obtain signal clearly, special interface circuits are required. By using such circuits, signals cleaned from offset, drift and 1/f Besides, if circuitry is configurable, it possible to inputs different ranges. At block, output moved band where noise effects not dominant by chopping modulation technique. The frequency-shifted then filtered various filter types. remove before moving back original band, Gm-C used. entire topology configured 5-bit digital converter (DAC) called Biasing DAC (BDAC). This allows us digitally change biasing current operational transconductance amplifiers (OTA), so that OTA based filters operate As conclusion, configurable has been designed. design layouts have realized simulated in Cadence Virtuoso UMC 130nm CMOS technology.