Low power off-chip driver circuit

Details Low power off-chip driver circuit Low power off-chip driver circuit

H - Electricity

03

K

328/158, 323/4

H03K 5/02 (2006.01) H03K 19/088 (2006.01) H03K 19/092 (1985.01)

Patent

CA 1250351

LOW POWER OFF-CHIP DRIVER CIRCUIT ABSTRACT OF THE DISCLOSURE Power dissipation in an off-chip driver circuit is decreased by utilizing a selectively switched transistor to discharge the base of the output pull-down transistor, and by using a large resistance in the base current path for the first stage of the Darlington pull-up transistors. An additional tran- sistor having a larger emitter area and coupled to a lower potential source is connected in parallel with the normal phase-splitter transistor to provide additional output current sinking capability, and a current mirror is connected to control the current through both the phase splitting transistor and the additional transistor to control the turn-on transi- tion of the pull-down output transistor.

457030

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