Avalanche noise measurements have been performed on a range of homojun
ction GaAs p(+)-i-n(+) and n(+)-i-p(+) diodes with avalanche widths, w
ranging from 1.13 to 0.050 mu m. These noise measurements show that,
contrary to McIntyre's avalanche noise theory, there is large reductio
n in the avalanche noise as w is decreased for both electron and hole
initiated impact ionisation.