An energy-consistent lumped-element equivalent circuit model for charged circular capacitive micromachined ultrasonic transducer (CMUT) cell is derived and presented. It is analytically shown and experimentally verified that a series dc voltage source at the electrical terminals is sufficient to model the charging in CMUT. A model-based method for determining this potential from impedance measurements at low bias voltages is presented. The model is validated experimentally using an airborne CMUT, which resonates at 103 kHz. Impedance measurements, reception measurements at resonance and off-resonance, and the transient response of the CMUT are compared with the model predictions.
The caption states the potentiation and depression observed in Fig. 21a and 21b respectively are for separate devices with different composition. Is it that each device exhibits only one of the behaviours shown or do the two devices exhibit both potentiation and depression as well? Also, what is the retention time of this potentiation and depression? Hyunsang Hwang responded: Thank you for your comment. It was a typo. We measured potentiation and depression using a Mo/TiO x /TiN device. I will revise the manuscript. Although we did not perform an in-depth study on retention characteristics, we cannot guarantee long-term retention using the Mo/TiO x /TiN device. Hyunsang Hwang answered: Thank you for your comments. I agree with your comments. We consider I-V linearity to implement matrix multiplication using an analog input voltage. If we cannot meet ideal I-V linearity, we can integrate the read current with multiple pulses which require additional circuits.
Your electrode was Mo, his was C. You didn't discuss the mechanism, do you suppose it's a similar mechanism? Also the stoichiometry, do you get a similar stoichiometry as that for his samples, i.e. 1 : 1?
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