Patent ID: 8188790

Claim:
Amplifier circuitry powered by a first supply voltage and a second supply voltage, comprising: (a) a driver amplifier for amplifying an input signal to generate an output signal, the driver amplifier having a first supply terminal for conducting a first driver amplifier supply voltage and a second supply terminal for conducting a second driver amplifier supply voltage; (b) first amplifier circuitry including 1) a first integrator amplifier and associated first integrating capacitor for producing a first output signal, and 2) a first pass transistor having a control electrode coupled to the first output signal; (c) a first pump capacitor having a first terminal coupled to the first supply terminal and the first supply voltage and a second terminal coupled to a first electrode of the first pass transistor; and (d) input circuitry for both controlling a direction of ramping of the first integrator amplifier during a first ramping interval to produce increased amplitude of the first driver amplifier supply voltage and controlling a direction of ramping of the first integrator amplifier during a second ramping interval to produce re-charging of the first pump capacitor in response to a control signal, the input circuitry including switching circuitry having an input coupled to receive the control signal, first current source circuitry having an input coupled to the switching circuitry and an output coupled to a first input of the first integrator amplifier, and second current source circuitry having an input coupled to the switching circuitry and an output coupled to the first input of the first integrator amplifier.