Analogue and Mixed-Signal Circuit Design

This chapter gives a detailed description of analogue and mixed-signal circuit design, focusing in particular on the S2S printed organic complementary technology. The design and characterisation of several building blocks based on different architectures are shown. After discussing simple differential OTAs, a mismatch-free comparator exploiting offset-cancellation techniques is demonstrated. This circuit is able to resolve differential input voltages as small as 50 mV for a V_dd of 40 V: a remarkable sensitivity for printed electronics. A printed DAC, the first ever demonstrated, is also shown. This DAC, based on a “R-2R” resistive network, achieves a maximum INL of 0.04 LSB at a resolution level of 4 bits. In addition, the HF behaviour of printed diode-connected OTFTs is studied and a four-stage rectifier is presented.