A Fully-Printed Self-Biased Polymeric Audio Amplifier for Driving Fully-Printed Piezoelectric Loudspeakers
A Fully-Printed Self-Biased Polymeric Audio Amplifier for Driving Fully-Printed Piezoelectric Loudspeakers
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DOI：
10.1109/tcsi.2016.2538060
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发表时间：
2016-06-01
影响因子：
5.1
通讯作者：
Ellinger, Frank
中科院分区：
文献类型：
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作者：
Kheradmand-Boroujeni, Bahman;Schmidt, Georg Cornelius;Ellinger, Frank
本文提出了一种印刷音频放大器，这是有机电子学的一个新应用。放大器由几个完全打印的可弯曲组件组成，包括：扬声器，有机场效应晶体管（ofet），电容器和电阻器。所有组件都是通过高通量印刷技术在聚对苯二甲酸乙二醇酯（PET）基板上制造的。报道了一个完整的自偏置电路，该电路由大型多指ofet组成，通道长度为20 μ m，总宽度为0.475米。该放大器在400 Hz时提供18 dB的峰值电压增益，在700 Hz至12.5 kHz范围内一米距离内可再现36-60 dBA的声压级，在驱动0 nF/类似于39 nF负载（V- dd = 80 V）时，单位增益带宽分别为17.7 kHz/5.2 kHz。在连续工作5小时后，偏置应力对放大器性能的影响被测量为类似于3 dBA的声音损失。整个电路被封装和层压在一个单独的PET片上。此外，对用于扬声器的印刷PVDF-TrFE压电聚合物的固有电阻抗进行了表征，并采用复介电常数进行了建模。
In this paper, a printed audio amplifier, which is a new application for organic electronics, is suggested. The amplifier consists of several fully-printed bendable components including: a loudspeaker, organic field effect transistors (OFETs), capacitors, and resistors. All components are fabricated on polyethylene terephthalate (PET) substrate by means of high-throughput printing techniques. A complete self-biased circuit is reported consisting of large multi-finger OFETs with channel length of 20 mu m and total width of 0.475 meter. The amplifier provides a peak voltage gain of 18 dB at 400 Hz, can reproduce sound pressure level of 36-60 dBA over 700 Hz to 12.5 kHz at one meter distance, and has a unity-gain-bandwidth of 17.7 kHz/5.2 kHz when driving 0 nF/similar to 39 nF load at V-DD = 80 V, respectively. The impact of bias-stress effects on the amplifier performance is measured to be similar to 3 dBA sound loss after 5 hours of continuous operation. The whole circuit is packaged and laminated on a separate PET sheet. In addition, the intrinsic electrical impedance of the printed PVDF-TrFE piezoelectric polymer used in the loudspeaker is characterized, and is modeled by a complex dielectric constant.