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

Mei, Xianglin; Chen, Zhuojia; Xu, Wen-Xing; Zhou, Lei; Wu, Weijing; Zou, Jianhua; Wang, Lei; Liu, Yurong; Peng, Junbiao

doi:10.1109/jeds.2021.3060954

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…In the second-stage, a differential-to-signal-ended converter is composed of source followers and current mirror loads [20]. The duplication of the current through M7A and M8A is reproduced by M8B and summed up with the current from M7B [22]. The gain of the second-stage can be expressed as [20] A V2 = g m7 r o8 2 (1 + g m7 r o8 )…”

Section: Voltage Gain Analysismentioning

confidence: 99%

A 50 dB high-gain operational amplifier integrated with metal-oxide TFTs

Chen¹,

Xu²,

Zuo³

et al. 2022

Semicond. Sci. Technol.

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This paper presents a 50 dB high-gain operational amplifier (OPAMP) ,which is fabricated by unipolar n-type indium-zinc-oxide (IZO) thin-film transistors (TFTs). Different positive feedback technologies are employed to achieve sufficient voltage gain. The fabricated OPAMP exhibits an open-loop voltage gain (Av) of 50 dB over a -3 dB bandwidth of 15 kHz at the supply voltage of 20 V. The measured unity-gain frequency (fUG) and the DC power consumption are 500 kHz and 8.07 mW, respectively. In addition, an effective frequency compensation scheme is also introduced and simulated. The simulation results that the proposed OPAMP has a voltage gain of 50 dB with 60° phase margin at 150 kHz unity-gain frequency after compensation.

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Section: Voltage Gain Analysismentioning

confidence: 99%

A 50 dB high-gain operational amplifier integrated with metal-oxide TFTs

Chen¹,

Xu²,

Zuo³

et al. 2022

Semicond. Sci. Technol.

Self Cite

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“…The pseudo-PMOS load is shown to be inherently stable despite of having internal positive-feedback loop following the aforementioned condition. Additionally, positive-feedback techniques can also be deployed to boost the transconductance g m itself [10], [11], thus resulting in higher performance. However, in this report we focus on realization of high output impedance with such technique.…”

Section: Introductionmentioning

confidence: 99%

Positive-Feedback-Based Design Technique for Inherently Stable Active Load Toward High-Gain Amplifiers With Unipolar a-IGZO TFT Devices

Dandekar

Myny

Dehaene

2022

IEEE Solid-State Circuits Lett.

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This letter presents analysis of an inherently stable positive-feedback based active load, first reported in our prior work, to realize high gain analog amplifiers using unipolar a-IGZO TFT technology. Additionally reported are theoretical performance bounds and design guidelines to maximally utilize a general positive-feedback scheme for the active load while maintaining stability. To demonstrate a design implementation, a single stage fully differential operational transconductance amplifier with common mode feedback has been manufactured and measured to have 40 dB open-loop gain at DC and a unity gain frequency of 61 kHz while driving a 30 pF load capacitance.

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