Patent ID: 7180371

Claim:
An input amplifier for power amplifier control circuitry comprising: an input; an output; a power supply voltage; a ground; a differential amplifier connected to the input, to the power supply voltage and to the ground, the differential amplifier providing a differential output; and, a double folded cascode and conversion stage connected to the differential amplifier, to the ground and to the power supply voltage, the double folded cascode and conversion stage converting the differential output to a single-ended signal, the double folded cascode and conversion stage being optimized to prevent variation in the power supply voltage from propagating to the output, wherein the double folded cascode and conversion stage includes: a first current source connected to the power supply voltage; a second current source connected to the power supply voltage; a first transistor connected to the first current source and to a first differential output of the differential amplifier; a second transistor connected to the second current source and to a second differential output of the differential amplifier; a third transistor connected to the first current source; a fourth transistor connected to the second current source and to the output; a fifth transistor connected to the third transistor and to the ground; and, a sixth transistor connected to the output and to the ground.