Flexible Bootstrapped Cascode System with Feedback for Capacitive Through-Substrate Electric Potential Measurements with a 55 dB Relative Gain
| Autor: | Julio C. Costa, Niko Munzenrieder, Helen Prance, Robert J. Prance, Arash Pouryazdan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Materials science business.industry Capacitive sensing Transistor Input impedance Noise (electronics) law.invention 03 medical and health sciences 030104 developmental biology 0302 clinical medicine law 030220 oncology & carcinogenesis Optoelectronics Cascode Electric potential business Electrical impedance Electronic circuit |
| Zdroj: | 2020 IEEE International Electron Devices Meeting (IEDM). |
| DOI: | 10.1109/iedm13553.2020.9372123 |
| Popis: | Measuring electric potentials using encapsulated flexible probes is advantageous especially when the signal source is comprised of soft and irregular organic tissues, such as the human brain or muscle fibers. However, the capacitive nature of encapsulated probes demands circuits with ultra-high input impedance and low 1/f noise, which are not trivially achieved using flexible transistors. Here, we show an a-IGZO based capacitive bootstrapped cascode buffer where the input impedance is actively controlled to allow capacitive electric potential measurements. By exploring different biasing schemes of the cascode element, we show a relative gain of 55 dB and a bandwidth between 450 Hz and 19 kHz. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|