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[Author] Cheon-Hyo LEE(1hit)

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  • Charge Pump Design for TFT-LCD Driver IC Using Stack-MIM Capacitor

    Gyu-Ho LIM  Sung-Young SONG  Jeong-Hun PARK  Long-Zhen LI  Cheon-Hyo LEE  Tae-Yeong LEE  Gyu-Sam CHO  Mu-Hun PARK  Pan-Bong HA  Young-Hee KIM  

     
    PAPER

      Vol:
    E91-C No:6
      Page(s):
    928-935

    A cross-coupled charge pump with internal pumping capacitor, which is advantageous from a point of minimizing TFT-LCD driver IC module, is newly proposed in this paper. By using NMOS and PMOS diodes connected to boosting nodes from VIN nodes, the pumping node is precharged to the same value at the pumping node in starting pumping. Since the first-stage charge pump is designed differently from the other stage pumps, a back current of pumped charge from charge pumping node to input stage is prevented. As a pumping clock driver is located in front of pumping capacitor, the driving capacity is improved by reducing a voltage drop of the pumping clock line from parasitic resistor. Finally, a layout area is decreased more compared with the conventional cross-coupled charge pump by using a stack-MIM capacitor. A proposed charge pump for TFT-LCD driver IC is designed with 0.13 µm triple-well DDI process, fabricated, and tested.