Speed-Power Improvement in High-Voltage Switches Employed in Multi-Electrode Arrays
Safarpour, Amin (Ferdowsi University of Mashhad)
Dehnavi, Farzaneh (Ferdowsi University of Mashhad)
Saberi, Mehdi (Ferdowsi University of Mashhad)
Lotfi, R. (TU Delft Bio-Electronics; Ferdowsi University of Mashhad)
Serdijn, W.A. (TU Delft Bio-Electronics; Erasmus MC)
In multi-electrode arrays (MEAs), for electrical recording and electrical stimulation, high voltage (HV) switches are employed to build an analog multiplexer to conduct either a HV stimulation signal from the pulse generator circuit to an electrode or a low-voltage noise-sensitive signal from the electrode to a recording stage. In this brief, a new circuit structure is proposed for HV switches that significantly improves their switching speed, reduces their power dissipation, and also employs a minimum number of bulky HV devices. In order to reduce the transition time of the proposed switch without consuming a large amount of power, during the transition time that the switch is turning on/off, a large current flows through the driver circuit of the switch to turn the switch on/off rapidly; however, after the transition times, this current is significantly reduced to save power. Based on the proposed HV switch, a multiplexer structure has been implemented in 25-V, 0.18- μm CMOS IC technology and the measurement results prove its efficacy. Supplied with 25 V and operating with 300 nA current consumption, this switch swings over 20 V with a relatively constant on-resistance of 100Ω and features a 80 ns transition time.
High-voltage analog multiplexer
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high-voltage analog switch
low power consumption
IEEE Transactions on Circuits and Systems Part 2: Express Briefs, 69 (7), 3139 - 3143
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© 2022 Amin Safarpour, Farzaneh Dehnavi, Mehdi Saberi, R. Lotfi, W.A. Serdijn