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US 7,030,670 B2Granted
Precise slew rate control line driver
AssigneeVIA Technologies, Inc.
InventorJoanna Lin
Life of this patent
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Abstract
A precise slew rate control line driver includes a slew rate control circuit, a first driver, and a second driver. The slew rate control circuit for slew rate control includes a first operational amplifier and a second operational amplifier. The first driver for driving output signal includes a first current source, a second current source, a first group of switches, and a second group of switches. The second driver for predetermined transient slope includes a capacitor, a third current source, a fourth current source, a third group of switches, and a fourth group of switches.
Claims12
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.
11 more elements
Dependencies are inferred from the claim text.