The paper presents a flexible polyimide fingerprint sensor driver IC driven by a 0.18‐μm CMOS technology and studies the sensor bendable performance. The finger valley and ridge are sensitive to environment noise; therefore, we propose low‐ripple cross non‐overlap charge pump that performs 7.2 V pumped output voltage with Δ30 mV ripple and 98.36% pump efficiency to increase the sensing level and propose mutual V_ref SAR ADC circuit with 6.6 V input swing range, 30 MS/s, ENOB of 10 bits, SNDR 74.1 dB, and bit error with INL [0.61, −0.7] and DNL [0.9, −0.62] to enhance the resolution. Through low‐ripple charge pump and mutual V_ref SAR ADC circuitry implementation, it makes the sensing of fingerprint valley and ridge capacitance signal still distinguishable when the film is bent harshly by the substrate radius 10 mm and, in the meanwhile, meet the FBI PIV biometric fingerprint image quality, which is upmost tough standard in biometric fingerprint of identification product.

中文翻译：

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灵活的指纹传感器驱动器IC和可弯曲的评估

本文介绍了一种由0.18μmCMOS技术驱动的柔性聚酰亚胺指纹传感器驱动器IC，并研究了传感器的可弯曲性能。手指谷和脊对环境噪声敏感；因此，我们建议使用低纹波交叉非重叠电荷泵，该泵执行7.2V的泵浦输出电压，具有Δ30mV的纹波和98.36％的泵浦效率，以提高感测水平，并建议采用6.6V输入摆幅范围的互V _ref SAR ADC电路30 MS / s，10比特的ENOB，SNDR 74.1 dB和INL [0.61，-0.7]和DNL [0.9，-0.62]的比特错误以提高分辨率。通过低纹波电荷泵和互V _ref SAR ADC电路的实现，使得当胶片以10mm的半径半径弯曲时，仍然可以区分指纹谷和脊电容信号，同时满足FBI PIV生物指纹图像质量，这是最严格的标准在识别产品的生物特征指纹中。