Multi sensor voltage signal conditioner with adaptive level shift and DC offset calibration on a single chip

This paper presents an adaptive signal conditioning method for multi sensors with initial voltage setting, offset calibration and signal amplification. The initial voltage setting process to VDD/2 (600 mV) by level shifters is implemented for adapting various sensor signals, even when the signal´s frequency is of several Hz or its initial voltage is of several mV. Offset calibration is implemented inside a programmable gain amplifier to compensate initial voltage setting error. The architecture can amplify various types of sensor signals below supply voltage (1.2 V) without coupling capacitors.