Methods and apparatus to dynamically increase amplifier slew rates

An apparatus comprising:

• a first transistor having a first input;
• a second transistor having a second input;
• input transistor circuitry coupled to the first transistor and the second transistor, the input transistor circuitry having a first output and a second output;
• slew assist circuitry coupled to the first transistor, the second transistor, and the input transistor circuitry, the slew assist circuitry having a first output and a second output;
• and
• output stage circuitry coupled to the input transistor circuitry and slew assist circuitry, the output stage circuitry having an output wherein a slew rate of a voltage on the output is based on a voltage on the first output of the slew assist circuitry and a voltage on the second output of the slew assist circuitry.

An apparatus comprising:

• feedback circuitry;
• current source circuitry having a first terminal and a second terminal, the first terminal of the current source circuitry is coupled to the feedback circuitry;
• a first transistor having a first terminal, a second terminal, and a control terminal;
• a second transistor having a first terminal, a second terminal, and a control terminal;
• a third transistor a first terminal, a second terminal, and a control terminal, the first terminal of the third transistor coupled to the current source circuitry and the first transistor;
• a fourth transistor a first terminal, a second terminal, and a control terminal;
• a fifth transistor having a first terminal and a control terminal, the first terminal of the fifth transistor coupled to the third transistor and the fourth transistor, the control terminal of the fifth transistor coupled to the feedback circuitry, the first transistor, and the second transistor;
• a sixth transistor having a first terminal and a control terminal, the first terminal of the sixth transistor coupled to the first transistor and the second transistor, the control terminal of the sixth transistor coupled to the feedback circuitry, the third transistor, and the fourth transistor;
• and
• current mirror circuitry coupled to the second transistor and the fourth transistor.