Patent ID: 7528661

Claim:
Output stage circuitry, comprising: (a) a diamond buffer including a PNP first input transistor, an NPN second input transistor, an NPN first output transistor, and a PNP second output transistor, an emitter of the first input transistor being coupled to a first conductor and receiving a first reference current having a first predetermined value, an emitter of the second input transistor being coupled to a second conductor and receiving a second reference current having the first predetermined value, bases of the first and second input transistors being coupled to an input conductor, bases of the first and second output transistors being coupled to the first and second conductors, respectively, emitters of the first and second output transistors being coupled to a first output conductor; and (b) a linear boost circuit including a first current mirror, a PNP first transistor having an emitter coupled to a first sensing resistor, a second current mirror, an NPN second transistor having an emitter coupled to a second sensing resistor, an input of the first current mirror being coupled to a collector of the second transistor, an output of the first current mirror being coupled to the first conductor, an input of the second current mirror being coupled to a collector of the first transistor, an output of the second current mirror being coupled to the second conductor to boost current in the first and second output transistors when they require base currents greater in magnitude than the first predetermined value.