In order to characterize the reliability of CMOS inverter
a kind of low-frequency noise model is deduced in detail by using the characteristics of load current and output voltage
based on the carrier fluctuation theory
and the accuracy of the model was verified by experimental data.The experiment results indicate that load current power spectral follows the changing rule of the 1/
f
noise
decreasing with the increase of frequency;the normalized noise power spectral density of load current decreases with the increase of the channel width or length.Using the experimental data
the relationship between 1/
f
noise and interface trap state densityof CMOS inverter is established.Verify that the 1/
f
noi
se can be used to characterize the reliability of CMOS inverter.It is proved that the larger interface trap state density
the larger the noise magnitude
leading to the degradation of device reliability and significant rise in device invalidation rate.That provides a feasible and effective method for evaluating the reliability of CMOS inverter.