an amplitude modulation path coupled to a first input of a power amplifier;

a first semiconductor device coupled to sink current flowing through the amplitude modulation path, the first semiconductor device comprising a first source region, a first gate region, and a first drain region, the first gate region and the first drain region separated by a first distance; and

a second semiconductor device comprising a second source region, a second gate region, and a second drain region, the second gate region and the second drain region separated by a second distance;

wherein the first distance is greater than the second distance and the first semiconductor device is coupled to the second semiconductor device.