期刊
IEEE ELECTRON DEVICE LETTERS
卷 34, 期 11, 页码 1394-1396出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2013.2280024
关键词
Analog circuits; indium-gallium-zinc-oxide (IGZO); operational amplifiers; thin-film circuits; thin-film transistors (TFTs)
An all-enhancement operational amplifier operating at 5 V and comprising 16 n-type amorphous indium-gallium-zinc-oxide thin-film transistors (TFTs) is fabricated on a 50 mu m thick flexible polyimide substrate. The operational amplifier has an open loop voltage gain of 18.7 dB and a unity-gain frequency of 472 kHz while the common-mode rejection ratio (CMMR) is larger than 40 dB. The mechanical flexibility of the amplifier is demonstrated by bending the circuit to a radius of 5 mm, which corresponds to a tensile strain of 0.5% parallel to the TFT channels. The bent amplifier shows the same output behavior as when flat. The power consumption of the operational amplifier is 900 mu W, regardless whether the circuit is flat or bent.
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