Patent ID: 7374954

Claim:
A method for manufacturing a ferroelectric capacitor of a ferroelectric register which includes a pull-up switch for outputting a power voltage when a pull-up enable signal is activated; a pull-up driving unit for receiving the power voltage from the pull-up switch, and for pulling up a voltage of a data storage node to the power voltage; a write enable control unit for transmitting a differential data to the data storage node according to a write control signal; the ferroelectric capacitor connected between the data storage node and a plate line and storing the differential data when a cell plate signal from the plate line is activated; a pull-down switch for transmitting a ground voltage to the data storage node when a pull-down enable signal is activated; and a pull-down driving unit for receiving the ground voltage from the pull-down switch and for pulling down the voltage of the data storage node to the ground voltage, comprising: a first process for forming at least two bottom electrode layers commonly connected to the data storage node; a second process for forming a ferroelectric layer on the at least two bottom electrode layers; and a third process for forming a top metal layer receiving the cell plate signal on the ferroelectric layer.