Title :
Ultra low-noise preamplifier for low-frequency noise measurements in electron devices
Author :
Neri, Bruno ; Pellegrini, Bruno ; Saletti, Roberto
Author_Institution :
Istituto di Elettronica e Telecommun., Pisa Univ., Italy
fDate :
2/1/1991 12:00:00 AM
Abstract :
The design and realization of an ultra-low-noise, high-input-impedance amplifier for low-frequency noise measurements in electronic devices is presented. Special care is devoted to the solution of typical problems encountered in the design of low-noise low-frequency equipment, such as power supply noise and temperature fluctuations. The ultra-low-noise preamplifier has a bandwidth of over seven decades with a low-frequency roll-off of 4 mHz. The noise characteristics obtained are sensibly better than those of commercial preamplifiers commonly adopted in low-frequency noise measurements. The application of this preamplifier to the realization of standard 1/fγ noise generators is presented
Keywords :
electric noise measurement; electron device noise; preamplifiers; 1/fγ noise generators; 4 mHz; electron devices; high-input-impedance amplifier; low-frequency noise measurements; low-frequency roll-off; noise characteristics; power supply noise; preamplifiers; temperature fluctuations; Electron devices; Frequency; Impedance measurement; Low-frequency noise; Low-noise amplifiers; Noise generators; Noise level; Noise measurement; Power supplies; Preamplifiers;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
