%0 Conference Paper %1 7300067 %A Shabanpour, R. %A Carta, C. %A Meister, T. %A Ishida, K. %A Kherdmand-Boroujeni, B. %A Ellinger, F. %A Münzenrieder, N. %A Salvatore, G. %A Petti, L. %A Tröster, G. %B 2015 European Conference on Circuit Theory and Design (ECCTD) %D 2015 %K myown %P 1-4 %R 10.1109/ECCTD.2015.7300067 %T A fully integrated audio amplifier in flexible a-IGZO TFT technology for printed piezoelectric loudspeakers %U https://ieeexplore.ieee.org/document/7300067/ %X This paper presents the design, implementation and characterization of an integrated power efficient cascode amplifier in a flexible a-IGZO thin-film transistors (TFTs) with minimum channel lengths of 25 μm. The circuit consists of a two-stage cascode amplifier for the audio baseband amplification and a source-follower as a buffer to drive printed loudspeakers. The proposed amplifier is fabricated on a 50 μm-thick flexible polyimide foil, and characterized with a 20 V dc supply voltage (VDD) and an output load capacitance of 15 pF. The measured voltage gain exceeds 15 dB from 4.5 kHz to 15 dB at 25 kHz. The measured 3 dB bandwidth of the unloaded audio amplifier spans from 2.2 kHz to 60 kHz. The amplifier consumes a dc power of 40 mW and delivers 10 dBV of output signal at the 1 dB compression point; this is sufficient to drive printed piezoelectric loudspeakers. The simulated frequency response of the loaded amplifier shows that the amplifier can drive a wide range of capacitive loads from 15 pF to 500 nF. The simulated 3 dB bandwidth of the amplifier loaded with the printed loudspeaker is 29 kHz.

@inproceedings{7300067, abstract = {This paper presents the design, implementation and characterization of an integrated power efficient cascode amplifier in a flexible a-IGZO thin-film transistors (TFTs) with minimum channel lengths of 25 μm. The circuit consists of a two-stage cascode amplifier for the audio baseband amplification and a source-follower as a buffer to drive printed loudspeakers. The proposed amplifier is fabricated on a 50 μm-thick flexible polyimide foil, and characterized with a 20 V dc supply voltage (VDD) and an output load capacitance of 15 pF. The measured voltage gain exceeds 15 dB from 4.5 kHz to 15 dB at 25 kHz. The measured 3 dB bandwidth of the unloaded audio amplifier spans from 2.2 kHz to 60 kHz. The amplifier consumes a dc power of 40 mW and delivers 10 dBV of output signal at the 1 dB compression point; this is sufficient to drive printed piezoelectric loudspeakers. The simulated frequency response of the loaded amplifier shows that the amplifier can drive a wide range of capacitive loads from 15 pF to 500 nF. The simulated 3 dB bandwidth of the amplifier loaded with the printed loudspeaker is 29 kHz.}, added-at = {2023-05-22T11:38:34.000+0200}, author = {Shabanpour, R. and Carta, C. and Meister, T. and Ishida, K. and Kherdmand-Boroujeni, B. and Ellinger, F. and Münzenrieder, N. and Salvatore, G. and Petti, L. and Tröster, G.}, biburl = {https://www.bibsonomy.org/bibtex/2cdae0efcc5f3540fb4a629f7ef638516/nikomu}, booktitle = {2015 European Conference on Circuit Theory and Design (ECCTD)}, doi = {10.1109/ECCTD.2015.7300067}, interhash = {53be9c3ca0523bb6758a71c30ab2bbed}, intrahash = {cdae0efcc5f3540fb4a629f7ef638516}, keywords = {myown}, month = aug, pages = {1-4}, timestamp = {2023-05-22T11:38:34.000+0200}, title = {A fully integrated audio amplifier in flexible a-IGZO TFT technology for printed piezoelectric loudspeakers}, url = {https://ieeexplore.ieee.org/document/7300067/}, year = 2015 }