Patent ID: 8004330
Filing Date: 2011-08-23
Classification: H03K

Abstract:
1. An apparatus for driving a differential signal, the apparatus comprising: a first output node for a non-inverted output signal of a differential signal; a second output node for an inverted output signal of the differential signal; a first driver subcircuit having an output coupled to the first output node; a second driver subcircuit having an output coupled to the second output node; and a slew rate control circuit responsive to a slew rate control input to selectively activate transistors of the first driver subcircuit and the second driver subcircuit; wherein in response to a first state of the slew rate control input, transitions at the first output node and the second output node have a first rising edge slew rate and a first falling edge slew rate, wherein the first rising edge slew rate is faster than the first falling edge slew rate; wherein in response to a second state of the slew rate control input, transitions at the first output node and the second output node have a second rising edge slew rate and a second falling edge slew rate, wherein the second rising edge slew rate is slower than the second falling edge slew rate.