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Browsing by Author "Fan, Ming-Yan"

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    A 80V Output Voltage Boost Converter with Low Voltage Ripple for Avalanche Photodiode(APD)
    (2011)
    Yang, Yao-Yi
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    Hsieh, Chun-Yu
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    Huang, Tzu-Chi
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    Lee, Yu-Huei
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    Wang, Shih-Wei
    The Avalanche Photodiodes (APDs) are widely used in a variety of optical application requiring high sensitivity, such as long-distance optical communication and optical distance measurement, because the APDs can detect the low level light. APDs accompanied with the Transimpedance Amplifier (TIA) are utilized on the receiver side in the communication system. The trend of integrating the active optical components faces the challenge of integrating different voltage levels. In general, the operation voltage of TIA is usually 1.8 V or 3.3 V. However, the APD requires a high reverse-biasing voltage of 40 V - 80 V. Therefore, a high conversation-ratio boost converter must be included to provide the high voltage to bias the APD. Besides, output voltage ripple must be minimized to decrease the influence on communication signals. Experimental results show the 80 V output voltage boosted from the input voltage of 2.5 V. The output voltage ripple is 2 mV under the condition of 1 mA load current.
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    A Near-Zero Cross-Regulation Single-Inductor Bipolar-Output (SIBO) Converter with an Active-Energy-Correlation Control for Driving Cholesteric-LCD
    (2011)
    Lee, Yu-Huei
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    Fan, Ming-Yan
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    Chen, Wei-Chung
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    Chen, Ke-Horng
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    Liu, Sheng-Fa
    A near-zero cross-regulation (near-zero CR) single-inductor bipolar-output (SIBO) converter with an adaptive-energy correlation (AEC) control is proposed as a compact power management solution for driving cholesteric-LCD (Ch-LCD). The SIBO converter can provide a pair of positive and negative output voltages with only one external inductor for achieving the polarity reversion operation in Ch-LCD to obtain high-quality displays. The proposed AEC control decides energy distribution for bipolar outputs without any cross regulation through the embedded prediction function. The chip fabricated in a 0.25 mu m CMOS process demonstrates near-zero cross-regulation at bipolar outputs with 90% peak power conversion efficiency.
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    A Single-Inductor Bipolar-Output Converter with 5 mV Positive Voltage Ripple for Active Matrix OLED
    (2011)
    Chen, Wei-Chung
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    Chiu, Chao-Chang
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    Hsieh, Chun-Yu
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    Huang, Tzu-Chi
    ;
    Lee, Yu-Huei
    This paper proposed a single inductor bipolar outputs (SIBO) switching converter for the active matrix Organic Light-Emitting Diode (AMOLED). The negative voltage is generated by the inverting buck-boost converter, which is regulated by the high signal-to-noise ratio comparator. Moreover, the boost converter is utilized to provide the positive output voltage. The proposed switching converter uses the switch sequential to reduce the positive voltage ripple to about 5 mV with the proportional-integral (PI) compensator to guarantee good line and load-regulation. Simulation results show the positive output voltage is regulated to 5V and the negative output voltage is -7V for driving the AMOLED. When the load current is 25 mA and the ESR is 30m Omega, the output voltage ripples are equal to 5 mV and 11 mV for positive and negative voltages, respectively. Besides, the load and line regulations of positive output voltage are 0.24 mV/mA and 5 mV/V, respectively. The maximum efficiency is 88.5% when the input voltage is 4.5 V and the load current is 50mA