GSHM noise generators are used as a measure of noise
power spectral density differential between 0.01 GHz and
20 GHz, when operating H5M noise figure analyzers and
SK4M spectrum analyzers with IKSH option.
Noise voltage source of GSHM is a bare avalanche transit-time diode (ATT diode) installed to hybrid integrated
circuit module, which is, in turn, connected to precision
microwave adapter with an attenuating adapter. ATT diode
is powered through the built-in current stabilizer providing stability of noise power spectral density irrespective
of noise generator supply voltage stability.