An a-IGZO Asynchronous Delta-Sigma Modulator on Foil Achieving up to 43dB SNR and 40dB SNDR in 300Hz Bandwidth 3.4kHz and increases robustness against batch to batch variations. At the comparator output a source follower drives the current DAC. This is composed of a current source and four switches, implemented as double gate TFTs with gate and TG connected together.

📋 论文概要

本文报道了一种在柔性聚酰亚胺衬底上使用非晶铟镓锌氧化物(a-IGZO)薄膜晶体管实现的异步Delta-Sigma调制器(ADSM)。该调制器在300Hz带宽和3.4kHz采样率下，实现了43dB的信噪比(SNR)和40dB的信噪失真比(SNDR)，展示了氧化物半导体在柔性电子产品中的应用潜力。

💡 主要创新点

• 首次在柔性箔片上实现基于a-IGZO TFT的异步Delta-Sigma调制器，克服了氧化物半导体迁移率较低和阈值电压漂移等挑战。
• 采用异步脉冲宽度调制(PWM)架构，无需时钟，降低了电路复杂度并适合柔性衬底的低速特性。
• 通过优化的电路设计和测量方法（如对PWM输出进行平方和滤波），实现了与硅基器件相当的动态性能。

🏷 关键词

📄 原文摘要

Gerwin H. Gelinck2, Arthur H. M. Van Roermund1, Eugenio Cantatore1 Figure 15.3.3 shows the measured ADSM output spectrum for a 100Hz IIN with -7dBFS amplitude: the fundamental, the limit cycle fundamental at 2kHz and its harmonics can be observed. Second and third signal harmonics and an intermodulation product (IM) with the 50Hz are also visible in the spectrum. SNR, SNDR, and SFDR of the ADSM have been measured by acquiring, squaring and filtering the PWM output in the signal band. Two scenarios have been chosen. In the first, the input signal frequency is set to 3.3Hz and BW is 10Hz, while in the second, the input frequency is 100Hz and BW is 300Hz. In both cases, second and third signal harmonics fall in the pass-band. The external reference current is set to 715nA, while the differential input current ranges between 7.8nA and 780nA. Figure 15.3.4 shows SFDR, SNR and SNDR measured for the two signal

👥 作者与机构

Carmine Garripoli1, Jan-Laurens P. J. van der Steen2, Edsger Smits2,