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When performing voltage noise measurements on a biased device, the DC component due to the bias must be rejected in order to avoid saturation of the high gain low noise input stage of the voltage amplifier employed to raise the level of the signal prior to sampling for spectral analysis. This is normally done by interposing an RC high pass filter between the device and the DC coupled amplifier input...
We report on experiments performed in order to verify the ability of low frequency noise measurements to serve as a sensitive tool for the characterization of the degradation of electron devices on flexible substrates as a consequence of mechanical stress. We designed and build a dedicated stress chamber for performing stress (repeated bending) in controlled environmental conditions. Test devices...
We propose a simple topology for the realization of ultra low noise differential-input, differential-output preamplifiers. The input devices can be either low noise JFET pairs (for high impedance sources) or low noise BJT pairs (for minimum low frequency voltage noise). Besides the input devices, the circuit requires only two matched low noise BJT transistor pairs (either PNP or NPN, depending on...
We propose an elaboration and visualization approach for spectral measurement that allows to monitor the progress of the estimation process in real time while maintaining a quaqi-constant resolution bandwidth over frequency ratio in a wide frequency range. The approach we propose is particularly useful in the estimation of low frequency noise, where the flicker component is dominant, since it allows...
We propose a simple but effective approach for the estimation of power spectra at very low frequencies (down to the tens of mHz range) by exploiting the characteristics of the sound system (sound card) and the computational power of modern personal computers. A simple mixer board has been designed that allows to transfer the low frequency region of the spectrum at a higher frequency in the passband...
The noise performances of monolithic operational amplifiers are generally insufficient for the realization of low noise amplifiers for applications in the field of low frequency voltage noise measurements. In order to obtain very low levels of equivalent input voltage and current noise, discrete JFETs input stages can be used, with the disadvantage of introducing a large input capacitance that can...
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