Independent power supplies for color inkjet printers

A print cartridge for printing drops of different inks using an inkjet printer, comprising:

• a printhead die mounted in the print cartridge having
• a plurality of groups of ink ejection elements, each group for controllably ejecting drops of an ink;
• and
• a plurality of firing pulse inputs, certain ones of the firing pulse inputs commonly connected to certain other ones of the groups of ink ejection elements in order to controllably eject the drops of the ink;
• and
• a conductive circuit connected to the printhead die, the circuit having
• a plurality of power interconnect pads, each pad for receiving one of a plurality of firing pulses, and
• a corresponding plurality of electrically conductive traces for conducting the firing pulses to the firing pulse inputs.

A method for printing with an inkjet printer, comprising:

• providing a plurality of groups of ink ejection elements, the elements in each group selectively ejecting ink in response to a corresponding one of a plurality of firing pulses;
• providing independently settable firing voltage levels for each of the plurality of firing pulses;
• setting each of the firing voltage levels to an appropriate voltage value for the corresponding one of the plurality of groups of ink ejection elements;
• and
• selectively generating the firing pulses for each group as governed by the data to be printed so as to emit ink drops from at least some of the ink ejection elements in at least two of the groups.