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Yoshikazu Ishii,Yasoji Suzuki,Takafumi Satoh,Shigeki Imai 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, a modified voltage reference circuitry using LTPS TFT is proposed. The new modified voltage reference circuitry is unaffected by fluctuations of the power supply voltage and the ambient temperature due to the utilization of enhancement-depletion (E-D) reference circuit and the operation in the weak inversion region for generation of a stable reference voltage. To verify the performance of the new modified circuitry, the circuit simulation is carried out by using SPICE. As a result of the simulation, the supply voltage dependability (SVD) and the temperature coefficient (TC) achieves to values of 0.08967 [%/V] and 0.00203[%/℃], respectively, when the ambient temperature (Ta) is +25℃ and the supply voltage (VDD) is +8V. In brief, these characterisitcs of the new modified circuitry are improved comparing with that of the conventional circuit.
Voltage Regulator using Low Temperature Poly Silicon Technology for TFT-LCD Panel
Takahiko Mizuno,Masahiro Yoshida,Shigeki Imai,Yasoji Suzuki,Shinichi Murata 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, a voltage regulator which can be integrated on a LCD panel using LTPS-TFT is proposed. The new voltage regulator can be reduced the deviation rate of the reference voltage (α') depending on the load fluctuation because the new voltage regulator provides a reference voltage shifter (RVS). By utilizing this circuit configulation, the proposed regulator can be obtained a stable constant output voltage. To confirm some performances of the proposed voltage regulator, the circuit analysis is carried out by using Smart-SPICE. As this results, the regulation rate of the output voltage (α) of the proposed voltage regulator is improved about 50% in comparison with that of conventional circuit under the conditions that the supply voltage (VDD) is +15V, the frequency (f) with the load current of+0.5㎃±0.5㎃ is 250㎑.