Patent ID: 7030670

Claim:
A precise slew rate control line driver comprising: a slew rate control circuit for controlling slew rate comprising: a first operational amplifier comprising a positive input end, a negative input end, and an output end; and a second operational amplifier comprising a positive input end connected to the positive input end of the first operational amplifier, a negative input end connected to the negative input end of the first operational amplifier, and an output end; a first driver for driving output signals comprising: a first current source comprising a first end connected to a voltage source, a second end connected to the positive input end of the first operational amplifier, and a control end connected to the output end of the first operational amplifier or the voltage source via a first group of switches; and a second current source comprising a first end connected to the positive input end of the second operational amplifier, a second end connected to a ground end, and a control end connected to the output end of the second operational amplifier or the ground end via a second group of switches; and a second driver for setting up transient slope comprising: a capacitor comprising a first did connected to the negative end of the first operational amplifier, and a second end connected to the ground end; a third current source comprising a first end connected to the voltage source, a second source connected to the first end of the capacitor, and a control end connected to a first bias signal source or the voltage source via a third group of switches; and a fourth current source comprising a first end connected to the first end of the capacitor, a second source connected to the ground end, and a control end connected to a second bias signal source or the ground end via a fourth group of switches.