Slew boost circuit for an operational amplifier

A circuit, comprising:

• a differential input stage including a first transistor, a second transistor, a third transistor, and a fourth transistor, wherein a current terminal of each of the first transistor and the third transistor are coupled together at a first node, and wherein a current terminal of each of the second transistor and the fourth transistor are coupled together at a second node;
• a first slew boost circuit including a fifth transistor and a first current mirror, the fifth transistor having a first control input, a first current terminal, and a second current terminal, the first control input coupled to the second node, the first current terminal coupled to the first node, the first current mirror coupled to the fifth transistor and to the second node;
• and
• a second slew boost circuit including a sixth transistor and a second current mirror, the sixth transistor having a second control input, an third current terminal and a fourth current terminal, the second control input coupled to the first node, the third current terminal coupled to the second node, the second current mirror coupled to the sixth transistor and to the first node.

A circuit, comprising:

• a differential input stage including a first node and a second node;
• a first slew boost circuit coupled to the differential input stage at the first and second nodes and to a ground node, wherein, responsive to a first, non-zero voltage polarity between the first and second nodes, the first slew boost circuit is configured to provide a first current path to the ground node;
• and
• a second slew boost circuit coupled to the differential input stage at the first and second nodes and to the ground node, wherein, responsive to a second, non-zero voltage polarity between the first and second nodes, the second slew boost circuit is configured to provide a second current path to the ground node, the second, non-zero polarity opposite the polarity of the first, non-zero polarity;
• wherein the first slew boost circuit includes a first transistor and a first current mirror, the first transistor having a first control input, a first current terminal, and a second current terminal, the first control input coupled to the second node, the first current terminal coupled to the first node, the first current mirror coupled to the first transistor and to the second node.