Abstract: The invention discloses a clock tree synthesis method including steps of: determining a driving strength of a clock cell; determining a reserved space corresponding to the clock cell according to the driving strength; generating the clock cell and the reserved space, wherein the reserved space is adjacent to the clock cell; setting a decoupling capacitor filler cell in the reserved space, wherein the area and/or capacitance of the decoupling capacitor filler cell are/is associated with the driving strength; and fixing the attribute(s) of the clock cell and the attribute(s) of the decoupling capacitor filler cell.

Abstract: The invention discloses a clock tree synthesis method including steps of: determining a driving strength of a clock cell; determining a reserved space corresponding to the clock cell according to the driving strength; generating the clock cell and the reserved space, wherein the reserved space is adjacent to the clock cell; setting a decoupling capacitor filler cell in the reserved space, wherein the area and/or capacitance of the decoupling capacitor filler cell are/is associated with the driving strength; and fixing the attribute(s) of the clock cell and the attribute(s) of the decoupling capacitor filler cell.

Abstract: A hand pad comprised of a flat pad provided on its surface a fixation means in a form of a stick containing a flexible wire on the top of the pad, two wings respectively extending from both sides and integrated in one piece with the pad, or a pad in a U shape to support the side of the palm or circle the little finger of the hand holding the pencil to define a segregation between palm and paper to prevent contamination by ink or carton powder and improve writing comfort.