Mathieu Guerin

High-Gain Fully Printed Organic Complementary Circuits on Flexible Plastic Foils

We present several fully printed organic complementary circuits using n- and p-type organic thin-film transistors. n-Type and p-type devices are developed on a flexible polyethylene-naphthalate substrate. All organic layers are deposited using a low-cost screen-printing technique. The inverters show a high gain and a switching point at exactly VDD/2. A seven-stage voltage-controlled oscillator (VCO) is designed with an organic output buffer, using the n- and p-type organic transistors. This VCO oscillates at a frequency of 186 Hz. Finally, two complementary differential amplifiers with high gain and large bandwidth are presented. The amplifiers only draw a 1-μA current from a 40-V power supply.

A temperature and gas sensor integrated on a 915MHz RFID UHF tag

We present a new battery-free RFID sensor which can be used as a node of a low cost sensor network. It can be used to detect either temperature and gas concentration, depending on the choice of the sensitive element. Its main features are a low consumption, a temperature sensibility range from 0 to 70 °C with a maximum reading distance of 7 m and an ammonia detection sensibility range from 0 to 10 ppm with a distance of 14 m. The circuit was layouted on ST Microelectronics 0.13 µm CMOS technology on a surface of 0.076 mm2

Design of organic complementary circuits for RFID tags application

This paper presents organic complementary circuits that can be used in an all-organic sheet-to-sheet processed RFID tag on plastic foils. An integrated organic eight-stage rectifier reaching a 14 MHz maximum working frequency is presented, as well as a physical unclonable function generator able to generate a code depending on the organic process scattering.

A low power voltage regulator for passive UHF RFID sensors

In this paper, a low power voltage regulator is presented. The regulator is based on the principle of a resistor-free voltage reference using CMOS transistors in sub-threshold region. An error op-amp is also designed to control the output current flowing through a pass transistor. The voltage regulator was manufactured using the 130 nm ST Microelectronics technology and represents a total area of 0.020 square millimeters. The measured regulated voltage has a temperature coefficient of 49 ppm per Celsius degree and a line regulation of 1.3 mV per Volt. These featured will permit to combine the regulator with a RF-to-DC rectifiers output voltage to supply a passive RFID temperature sensor.

Design of Fully-Printed Organic Circuits on Plastic Foils for Wireless Systems

This work is dedicated to the design of fully-printed organic circuits on plastic foils. Passive ring mixers, diode-based active envelope detectors and a flash analog to digital converter are presented. The circuits based on N-type and P-type transistors are manufactured using an organic sheet-to-sheet process in ambient air. The fully-printed active envelope detector based on nine transistors and a capacitance shows better performance than the one described in the literature. The detector is able to perform with different waveforms of AM-modulated signals under a +/−20 V supply voltage for a 40 kHz carrier frequency. It still performs correctly for a modulation depth of 10%. The passive ring mixers only use four transistors and are able to mix a 5 Hz modulating wave with carrier frequencies from 100 Hz until 2 kHz. The analog to digital converter is designed with 45 transistors and four screen-printed carbon resistors for a total surface of 760 mm2. The circuit converts a 20 Hz analog input signal into a digital 2-bit output code under a +/−20 V supply voltage. All presented circuits are simulated before the realization and their measurement is performed in ambient air.