Patent ID: 7466201

Claim:
Circuitry including a class AB output stage, the class AB output stage comprising: (a) a first output transistor having a first electrode coupled to a first reference voltage, a second electrode coupled to an output conductor, and a control electrode coupled to a first conductor, and a second output transistor having a first electrode coupled to a second reference voltage, a second electrode coupled to the output conductor, and a control electrode coupled to a second conductor; (b) a first transistor having a first electrode coupled to a first input conductor conducting a first input current, a second electrode coupled to the first conductor, and a control electrode coupled to the first conductor, and a second transistor having a first electrode coupled to a second input conductor conducting a second input current, a second electrode coupled to the second conductor, and a control electrode coupled to the second conductor; (c) a third transistor having a first electrode coupled to the first input conductor, a second electrode coupled to the second conductor, and a control electrode coupled to a first bias voltage conductor to receive a first bias voltage, and a fourth transistor having a first electrode coupled to the second input conductor, a second electrode coupled to the first conductor, and a control electrode coupled to a second bias voltage conductor to receive a second bias voltage; (d) a first bias circuit for producing the first bias voltage and a second bias circuit for producing the second bias voltage; and (e) a folded cascode stage coupled between the first and second reference voltages for producing the first and second input currents in response to an input signal.