Design and electrochemical measurement of a current-mode analog-to-time converter with short-pulse output capability using local intra-cell activation for high-speed time-domain biosensor array
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This study demonstrates a current-mode analog-to-time converter (CMATC) enabling short-pulse output capability by using the newly-proposed local intra-cell activation technique, which contributes to the development of high-speed time-domain biosensor array. In the conventional CMATC, the activation pulse is generated globally at the periphery. This limits the output pulse width because of the considerable parasitic word-line capacitance. In this study, a shorter pulse output was achieved by generating the activation pulse locally by using intra-cell configuration without being affected by word-line capacitances. In 1024 × 1024 configuration, 77% pulse width reduction was confirmed using SPICE simulation. A test chip was fabricated using a 0.6 µm standard CMOS process. The measurement results obtained using a sensor chip demonstrate the expected input–output characteristic and 3.36 ns pulse output. Finally, we measure the change in potential with respect to the ratio of the ion concentration, by using Fe(CN) 6 3− and Fe(CN) 6 4− as the oxidant and reductant, respectively.
KeywordsBio-imaging Time-domain Current-mode Short-pulse output
This research was financially supported by JST, PRESTO, by a Grant-in-Aid for Scientific Research (S) (Nos. 20226009, 25220906), Grants-in-Aid for Young Scientists (A) (No. 16H06088) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, by the Strategic Information and Communications R&D Promotion Programme (Nos. 121806006, 152106004) of the Ministry of Internal Affairs and Communications, Japan, by TOYOTA RIKEN, and by The Nitto Foundation.
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