Cmos driver circuit

Details Cmos driver circuit Cmos driver circuit

H - Electricity

03

K

328/186

H03K 17/687 (2006.01) H03K 19/003 (2006.01) H03K 19/017 (2006.01)

Patent

CA 2024638

A CMOS integrated circuit for driving capacitance devices is provided. The circuit has an input node and an output node and includes a first transistor operatively connected to the input node which is turned "on" and "off" by the input node to supply an output signal to the output node when turned "on". A second transistor is provided, the output of which is connected to the output node when turned "on" to supply an output signal thereto. A control circuit is provided to turn on the first transistor prior to the second transistor, and to turn on the second transistor if and only if the slew rate of the output signal of the first transistor is less or slower than a given value. With this arrangement, if there is a low total capacitance of the capacitance devices being driven, the first transistor will have a fast enough slew rate that it will perform the entire charging function of the devices without turning on the second transistor; however, if the total capacitance of the devices being charged is sufficiently large, the low slew rate of the first transistor will cause the second transis- tor to be turned on, thereby providing additional charging voltage to the capacitance devices, thus decreasing the time that would be required if only the first transistor were employed for the entire charging.

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