Yasoji Suzuki

Low-power consumption level-shifter used clamping circuit technique and LTPS technology for TFT-LCD

In this paper, a low-power consumption level-shifter using the clamping circuit technique and LTPS (low temperature poly silicon) technology for TFT LCD (thin film transistor-liquid crystal display) is proposed. The new proposed level-shifter can convert from the input amplitude of 0/spl sim/+3 V to the output amplitude of 0/spl sim/+10 V by using only one input signal. The power consumption of the proposed level-shifter can be reduced to about 1/2 that of the conventional one under conditions of +10 V power supply voltage, 1 pF load capacitor and 2 MHz operating frequency. For an application, the proposed level-shifter can be adopted to the high-voltage generator.

All CMOS Low Drop-Out Regulator with Large Supply Currents for System using Li-ion Battery

In this paper, low drop-out (LDO) regulator for system using lithium-ion (Li-ion) battery is proposed. The new LDO consists of a current supply circuit (CSC) and a bias voltage generator (BVG). The new LDO can stability converts the battery voltage VDD from +3.3 V to +4.5 V into the reference voltage VREF of +3.0 V. The fluctuation rate DeltaV0 is less than about 1% and the power conversion efficiency eta is around 91% under the conditions of the load operating frequency f of 20 MHz, the draw currents I0 of 200 mA and the battery voltage VDD of +3.3 V. Furthermore, the proposal circuits execute very high-efficiency conversion and it is very suitable as LDO regulator for system using Li-ion battery

Asynchronous High-Speed Combination Logic Circuitry using LTPS-TFT and BST for LCD Panel

In this paper, an asynchronous high-speed logic circuitry using low temperature poly silicon-thin film transistor (LTPS-TFT) and the bootstrapped technology (BST) for liquid crystal display (LCD) is proposed. The proposed logic circuit operates at high frequency region owing to the deep non-saturation operation by using the bootstrapped technology. To confirm some characteristics of the proposed circuit, an inverter and a NAND gate circuits are simulated. As the results, the power delay products are about 1/3 times less value than that of the conventional circuit under the conditions of +10 V power supply voltage and 0.5 pF load capacitor.

High speed standard cell using bootstrapped technology for LTPSTFT

In this paper, a synchronous high-speed logic standard cells using bootstrapped technology for low temperature poly silicon thin film transistor -liquid crystal display (LTPS TFT-LCD) panel is proposed. The proposed TFT standard cells operate at high frequency region owing to the deep non-saturation operation by using the bootstrapped technology (BST). The proposed TFT standard cells can be reduced the pattern size by using the TFT capacitors for the bootstrapped capacitors. To confirm some characteristics of the proposed TFT standard cells, a full adder (FA) are simulated. As a result, the power delay products obtain about 1/5-9/10 times less value than that of the conventional standard cells using LTPS TFT.

New high-voltage generator obtained some boosted voltages with large-output currents

To obtain boosted output voltage simultaneously with large output currents, such as 100 mA, a new high-voltage generator for a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) is proposed. The new proposed generator is constituted of charge-pumping circuits to generate positive and negative high-voltages. The total power efficiency, /spl eta//sub T/, is a good value of about 70%, in comparison with the conventional one of around 10%, when the new generator produces +5V/-5V output voltages with +100mA/-100mA output currents from a +3V single power supply voltage.

High-speed logic circuitry used bootstrapped technology and low-temperature poly-silicon technology for TFT-LCD panel

In this paper, a high-speed logic circuitry used bootstrapped technology and Low Temperature Poly Silicon (LTPS) technology for TFT- LCD panel is proposed. The high-speed logic circuitry realizes the high-speed operation due to applying the wider swing-voltage than the power-supply voltage by using the bootstrapped technology. As the results, the new logic circuitry can operate at the operational frequency by around 10 times than the conventional circuitry under the conditions of 0.5pF load-capacitor and +1OV power-supply voltages.