Temperature Monitor

This chapter presents two key circuits for implementing sensor-based applications in organic electronics: an ADC and a temperature sensor. The 4-bit ADC is fabricated with a printed organic complementary process (S2S technology) and features an integrated resistive DAC. Measurements of the ADC show 25.7 dB SNR and 19.6 dB SNDR at 2 Hz bandwidth, demonstrating, for the first time, the capability of OTFT printing technologies to fabricate data converters. According to further measurements of the ADC building blocks, achieving resolutions up to 7 bit is already feasible using the same architecture and manufacturing technology. The resistive temperature sensor is fabricated in a roll-to-roll technology on a plastic foil. The ADC is tested together with the sensor in a system to monitor ambient temperature.