The highlight of in vivo or ex vivo measurement to monitor the pH value from blood or saliva is emerging in these years since changes in pH suggest that hidden diseases are about to occur. In this paper, we design and implement a SoC for pH measurement, and a dual offset cancelation technique in comparator featured with 150-uV input referred voltage and 1-GHz comparison bandwidth is verified. The SoC by utilizing proposed dual offset cancelation technique can sense 8 femto farad capacitance change in the deionized water, 12 femto farad change in the glucose liquid, and 14 femto farad in the 0.5% hydrochloric acid.The SoC for pH measurement is not only used to detect pH change in blood or saliva, but can also extend to wearable device to monitor human's biomarkers such as pH and Na+ in sweat to prevent the disease in advance.

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.

No abstract

No abstract

No abstract