• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.696-699
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• 2008

A 10-bit source driver using low temperature poly-silicon(LTPS) TFTs is developed. To reduce the DAC area, the DAC structure including two 5-bit resistor-string DACs and analog buffer, which has analog adder is proposed. The source driver is fabricated using LTPS process and its one channel area is $3,200{\mu}m\;{\times}\;260{\mu}m$. The simulated INL and DNL of output voltages are less than 3 LSB and 1 LSB, respectively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.6
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• pp.1109-1114
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• 2003

In this paper, the electric characteristic of the SGPS with slot in the ground plane is similar to the parallel resonant circuit. When the slot length in SGPS is equal to the half wavelength of specific frequency, the characteristic of SGPS represent the large attenuation at the specific frequency. We found out the relation between attenuation and resistor on the slot in SGPS and we designed the variable attenuator for MMIC using the variable resistor. This attenuator can be applied to AGC circuit in transceiver if the PIN diode is used replace for resistor.

• Electrical & Electronic Materials
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• v.8 no.1
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• pp.27-34
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• 1995

The analysis of nonlinear equivalent circuit and the resonance characteristics of input current and output voltage were simulated, and their electrical properties are discussed in the transverse-type piezoelectric ceramic transformer. The nonlinear resonance characteristics of input current and output voltage showed by the thermal effect due to a higher driving current, the nonlinearity increased greatly as driving current increased. When load resistor was 100[M.ohm.], the nonlinear coefficient was -1.3. The nonlinear resonance curve of input current and output voltage for a variation of input voltage and load resistor agreed with the discussed theory. The output voltage increased nearly proportioned to input voltage when load resistors were below 50[M.ohm.], the voltage step-up ratio decreased when a load resistor was 100[M.ohm.] and their maximum value was 950.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.759-762
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• 2002

In this paper, a voltage-controlled linear variable resistor (VCLVR) using a floating-gate MOS-FET (FG-MOSFET) is proposed. The proposed-circuit is the grounded VCLVR consists of only an ordinary MOSFET and an FG-MOSFET. The advantage of the proposed VCLVR are low-voltage and wide-input range. Next, as applications, a floating-node voltage controlled variable resistor and an operational transconductance amplifier using the proposed VCLVRs are proposed. The performance of the proposed circuits are characterized through HSPICE simulations with a standard 0.6 ${\mu}$m CMOS process. simulations of the proposed VCLVR demonstrate a resistance value of 40 k$\Omega$ to 338 k$\Omega$ and a THD of less than 1.1 %.

• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.3
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• pp.307-314
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• 1988

The thin, square-diaphragm silicon pressure sensor utilizing shear piezoresistance effect was designed and fabricated and its characteristics were examined. The sensor has only one diffused resistor, whereas conventional full-bridge sensor has four. Sensitivity is somewhat lower but temperature compensation is easier than the latter. The proposed sensor was fabricated with only one p-type diffused resistor of the dimension of 113x85\ulcorner\ulcornerlocated near the center of the edge of the diaphragm. The resistor was at 45\ulcornerwith the edge of the diaphragm. The sensitivity of the sensor was 36\ulcorner/V\ulcornermHg and was linear in the pressure range from 0 to 300 mmHg. The temperature coefficient without temperature compensation was 55 ppm/\ulcorner and it was decreased to about 0.17 mmHg/\ulcorner with compensation in the range from 10 to 60\ulcorner.

• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.231-234
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• 2002

In this paper, we propose an efficient bias circuit for hearing aid using discrete BJT. The collector feedback bias circuit, widely used for the hearing aid, has a resister for negative feedback. As the resistor affects AC and DC simultaneously, it is quite difficult to adjust amplifier gain without changing DC bias point. The previous bias circuit also has weak point to be oscillated by the positive feedback of power noise if gain of hearing aid is high. In the proposed circuit, we can reduce the two weak points of the previous circuit by adding a resistor which is ${\beta}$ times larger than collector resistor between base of BJT and power supply.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.30 no.1
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• pp.59-62
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• 2017

CNT (carbon nanotube) resistors with low resistance and negative TCR (temperature coefficient of resistance) were fabricated with yarned CNT (carbon nanotube) fibers. The CNT fibers were prepared by yarning CNTs grown on the silicone substrate by CVD (chemical vapor deposition) method. The CNT resistors were fabricated by winding CNT fibers on the surface of ceramic rod. Both metal terminals were connected with the CNT fiber wound on the ceramic rod. We measured electrical resistance and thermal stability with the number of CNT fibers wound. The CNT resistor system shows linearly decreased resistance with the number of CNTs wound on the ceramic rod and saturated at 20 strands. The CNT resistor system has negative TCR between $-1,000{\sim}-2,000ppm/^{\circ}C$ and stable frequency properties under 100 kHz.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.542-545
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• 2002

This paper deals with the optimization inverter design and minimization Conduced EMI noise by customizing IPM(Intelligent Power Module). Generally, In case of IPM, we realized that the trade-off relation between switching loss and spike voltage. Higher gate resistor causes tile lower spike voltage and the higher turn-off switching loss. But we know that the life cycle of inverter and the susceptibility of noise, so we optimized the gate resistor. Proposed method is that optimized the gate resistor suitable for the inverter and motor. The simulation and experimental results show that the spike voltage and Conduced EMI noise can be reduced without the additional circuit.

• International Journal of Aeronautical and Space Sciences
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• v.7 no.1
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• pp.54-64
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• 2006

To augment weakly damped lag mode stability of a hingeless helicopter rotor blade in hover, piezoelectric shunt with a resistor and an inductor circuits for passive damping has been studied. A shunted piezoceramics bonded to a flexure of rotor blade converts mechanical strain energy to electrical charge energy which is dissipated through the resistor in the R-L series shunt circuit. Because the fundamental lag mode frequency of a soft-in-plane hingeless helicopter rotor blade is generally about 0.7/rev, the design frequency of the blade system with flexure sets to be so. Experimentally, the measured lag mode frequency is 0.7227/rev under the short circuit condition. Therefore the suppression mode of this passive damping vibration absorber is adjusted to 0.7227/rev. As a result of damping enhancement using passive control, the passive damper which consists of a piezoelectric material and shunt circuits has a stabilizing effect on inherently weakly damped lag mode of the rotor blades, at the optimum tuning and resistor condition.

• Proceedings of the KIEE Conference
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• 1994.07b
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• pp.1633-1635
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• 1994

This paper presents the development technology of standard resistor divider for full lightning impulse voltage. The ability of high voltage bulk power equipment to withstand lighting stroke is usually evaluated by means of full lightning impulse voltage. Lightning impulse voltage test has been essential to evaluate the insulation performance of electrical power apparatus. Recently International standard (IEC 60) on high voltage measurement techniques is being revised and requests a formal traceability of high voltage measurements. Therefore, general interest for this area has grown considerably during last years, and several international intercomparisions have been completed already worldwide, i.e. Europe, Japan, America etc.. In this viewpoint, we have also investigated the standard resistor divider with shield, which satisfies the IEC recommendation.