Patent ID: 9287838
Filing Date: 2016-03-15
CPC Classification: H03F

Claim Text:
1. A high slew rate operational amplifier, comprising: an input terminal; an output terminal; and at least one slew-rate enhancing circuit, a slew-rate enhancing circuit of the at least one slew-rate enhancing circuit comprising a first stage enhancing unit and a second stage enhancing unit, wherein the first stage enhancing unit is coupled between the input terminal and the output terminal, the first stage enhancing unit and the second stage enhancing unit are coupled, the slew-rate enhancing circuit has a threshold voltage and the threshold voltage is related to a size of the first stage enhancing unit, when the slew-rate enhancing circuit is driven by the threshold voltage, the slew-rate enhancing circuit rapidly activates the second stage enhancing unit to perform a slew rate compensation on the high slew rate operational amplifier; wherein the first stage enhancing unit comprises a first transistor and a second transistor, the first transistor and the second transistor are coupled to the input terminal and the output terminal respectively, the second stage enhancing unit comprises a third transistor coupled to the first transistor, the first stage enhancing unit further comprises a fourth transistor, a fifth transistor, and a sixth transistor, the fourth transistor and the fifth transistor are coupled, the fourth transistor is coupled to the first transistor and the third transistor, the fifth transistor is coupled to the second transistor, the sixth transistor is coupled to the first transistor, the second transistor, and a ground terminal.