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This paper presents a common-drain-based operational amplifier (OPAMP) fabricated by mono n-type indium-zinc-oxide (IZO) thin-film transistors (TFTs). Positive feedback technology is employed to the load TFTs by cross-coupled connection in order to boost the voltage gain of the common-drain differential pair. The OPAMP exhibits an open-loop voltage gain (A<sub>v</sub>) of 27 dB over a &#x2212;3 dB bandwidth (BW) of 8.4 kHz at a DC supply voltage of 10 V. The measured unity-gain frequency (UGF), phase margin (PM) and DC power consumption are 119.4 kHz, 36&#x00B0; and 0.96 mW, respectively. Moreover, the chip area of the proposed OPAMP is as small as 0.37 mm <inline-formula> <tex-math notation="LaTeX">$\times0.3$ </tex-math></inline-formula> mm since this concise topology needs only 10 TFTs.

A Common Drain Operational Amplifier Using Positive Feedback Integrated by Metal-Oxide TFTs