Seunghyun Im

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A low pass filters (LPFs) are important building blocks for many analog integrated circuit design. The biomedical applications or the sensor applications require the LPFs with very low cut-off frequency. The simplest way to implement the LPF is using the passive RC filter. The passive RC LPF, however, consumes large chip area when the desired time constant(More)
—The neural stimulators have been employed to the visual prostheses system based on the functional electrical stimulation (FES). Due to the size limitation of the implantable device, the smaller area of the unit current driver pixel is highly desired for higher resolution current stimulation system. This paper presents a 16-channel compact current-mode(More)
This paper presents an analog front-end (AFE) IC for measuring biopotential signals such as electroencephalogram (EEG) and, electrocardiogram (ECG). The AFE employs the capacitively coupled chopper instrumentation amplifier architecture to achieve low noise. To reduce chopper ripple and respiration artifacts, a continuous-time AC-coupled ripple reduction(More)
The neural stimulators have been employed to the visual prostheses system based on the functional electrical stimulation (FES). Due to the size limitation of the implantable device, the smaller area of the stimulator IC is highly desired. This paper presents a neural stimulator with photodiode for visual prostheses. The proposed stimulator provides the(More)
An analog front-end design that can improve the performance of the readout integrated circuit (ROIC) for the microbolometer infrared (IR) focal plane array (FPA) is presented. The analog front-end circuit for the microbolometer generally consists of the resistance-to-current (R-I) converter and the capacitive transimpedance amplifier (CTIA). The resistances(More)
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