Slew rate enhancement circuit

Details Slew rate enhancement circuit Slew rate enhancement circuit

2006-06-27

2006-06-27

Eisen, Alexander (Department: 2677)

Amplifiers

Signal feedback

C330S296000, C327S309000

Reexamination Certificate

active

07068098

ABSTRACT:
An operational amplifier (op-amp) (200, 800, 900) having at least a first stage and a second stage has a feedback path (825) from the output to the input of a second stage, the feedback path includes a first capacitor (801) and a second capacitor (803) in series connected at a node (815) between the first capacitor and the second capacitor, and a clamping circuit (206) connected between the node and a ground (230) for clamping a voltage at the node in response to a voltage at the output. The impedance of the clamping circuit is high during small amplitude input signals, and is low during large amplitude input signals. During large amplitude input signals, the compensation capacitance of the op-amp does not provide feedback from the output to the input, thereby increasing slew rate. A liquid crystal display panel system (1100) includes the op-amp (900) as a column driver.

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