3–5 V, 3–3.8 MHz OOK modulator with a-IGZO TFTs for flexible wireless transmitter

Ishida, K, Meister, T, Knobelspies, S, Munzenrieder, N, Cantarella, G, Salvatore, G A, Troster, G, Carta, C and Ellinger, F (2018) 3–5 V, 3–3.8 MHz OOK modulator with a-IGZO TFTs for flexible wireless transmitter. Microwaves, Antennas, Communications and Electronic Systems (COMCAS), 2017 IEEE International Conference on, Tel-Aviv, Israel, 13-15 Nov. 2017. Published in: 2017 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS). 1-4. IEEE

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This paper presents an On-Off-Keying (OOK) modulator for a flexible and wearable wireless transmitter implemented in an amorphous-Indium-Gallium-Zinc-Oxide (a-IGZO) TFT technology. The circuit consists of a three-stage ring oscillator for the carrier and an output driver with an OOK modulation switch, realized with just five transistors. In order to maximize the operation frequency, we use 2 μm-long nMOS transistors in the circuit design. The proposed OOK modulator is fabricated on a polyimide flexible substrate, and characterized with 3-to-5 V supply voltages and an output load capacitance of 15 pF. The circuit operates from the lowest supply voltage of 3 V, while the highest measured oscillation frequency is 3.76 MHz at 5 V V DD . Although the schematic is simple and straight forward, the equivalent modulation depth ranges from 61.3 % to 78.2 %, which can be detected with an existing AM/OOK receiver in the same technology. The power consumptions for 3 V and 5 V supply voltages are 2.15 mW and 6.77 mW, respectively.

Item Type: Conference Proceedings
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Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Sensor Technology Research Centre
Depositing User: Niko Munzenrieder
Date Deposited: 10 Jan 2018 11:49
Last Modified: 16 Feb 2022 12:30
URI: http://sro.sussex.ac.uk/id/eprint/72717

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