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This paper presents a high-uniformity post-CMOS fabricated uncooled microbolometer focal plane array (MFPA) integrated with an active matrix circuit. The MFPA is consisted of 64 by 64 microbolometer cells. To improve the output non-uniformity, the active matrix circuit with column-wise transistor-sharing scheme is proposed. The active matrix circuit selects the row and column of MFPA, calibrates the...
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 is large. The transconductance-C (gm-C) filter...
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 of the microbolometer FPA are changed when...
This paper presents a high-uniformity post-CMOS fabricated uncooled microbolometer focal plane array (MFPA) integrated with an active matrix circuit. The active matrix circuit selects the row and column of MFPA, calibrates output offset and gain, and converts the resistance changes of MFPA to the output currents. The active matrix circuit with column-wise transistor-sharing scheme is proposed to improve...
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 high resolution current stimulation system. This paper presents a 16-channel compact current-mode neural stimulator IC with digital to analog converter...
As the sensing capacitances of the recent microaccelerometers become smaller, a precise calibration method is highly required to compensate for the input parasitic capacitance mismatch. This paper presents a sub-fF trimmable readout circuit for capacitive tri-axes microaccelerometer. A charge sensitive amplifier (CSA) with correlated double sampling (CDS) and digital to-equivalent capacitance converter...
A programmable continuous-time capacitive ASIC for MEMS (Microelectromechanical System) vibratory gyroscope is presented. The programmable readout circuit minimizes process variations including parasitic capacitances and fabrication imperfections. The fabricated ASIC adopts continuous-time chopper-stabilized architecture to achieve low noise characteristics. To cancel the parasitic effects and to...
This paper presents a novel current reference circuit with negative feedback loop for biomedical neural current stimulator using the mutual compensation of threshold voltage and mobility. The negative feedback loop in this circuit effectively reduces the sensitivity both to the process and temperature variations. The nominal current output is designed to be 4 μA, and the temperature coefficient is...
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