Data Converters
A linearized technique in an All-MOS transconductance amplifier
Microelectronics Journal
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This paper presents a prototypical interface circuit for deep brain stimulation surgery. It provides four channel outputs with a stimulating current. This stimulating circuit adjusts its output current by utilizing the switched-capacitor DAC and voltage-to-current transconductance amplifiers with the power-down mode to achieve a higher resolution and to save the power dissipation. The biphasic stimulating waveform is generated using a bridge switching technique and the programmable pulse signals are adjustable for width and frequency. By fabricating with a standard 0.35-@mm CMOS technology at a 3.3V supply voltage, the reduced output stimulating current has 8-bit resolutions for amplitudes between 5@mA and 155@mA, 4-bit resolutions for frequencies between 126Hz and 244Hz, and 4-bit resolutions for time intervals between 0@ms and 120@ms.