Detailed measurements are reported of the 1/f noise in GaAsFETs. The r
esults are analysed using information obtained from detailed trap char
acterization. It is found that the 1/f noise intensity is very variabl
e between specimens, does not follow the Hooge relation and appears to
be related, under some conditions, to the traps which produce the gen
eration-recombination noise which is also observed.