DocumentCode
1062263
Title
Ultra-Low-Noise High-Input Impedance Amplifier for Low-Frequency Measurement Applications
Author
Levinzon, Felix A.
Author_Institution
Endevco/Meggitt Corp., San Juan Capistrano, CA
Volume
55
Issue
7
fYear
2008
Firstpage
1815
Lastpage
1822
Abstract
The design of a low-frequency high-input-impedance amplifier having probably the lowest noise ever reported is presented. The amplifier´s frequency range is from about 0.07 Hz to about 110 kHz at the -3-dB level. The equivalent input noise voltage spectral density is about 5.6, 1.4, 0.6, and 0.5 nV/radicHz at frequencies 0.1, 1, 10, and 1000 Hz, respectively. Gain of the amplifier is about 83 dB. Noise analysis is made for active-type, capacitive-type, and low impedance signal sources. The contribution from different noise sources in the amplifier and JFET to the overall noise is shown.
Keywords
junction gate field effect transistors; low noise amplifiers; noise measurement; spectral analysis; JFET; equivalent input noise voltage spectral density; frequency 0.07 Hz to 110 kHz; frequency range; gain 83 dB; low-frequency high-input-impedance amplifier; low-frequency measurement applications; noise analysis; noise figure -3 dB; signal sources; Amplifiers; JFETs; analog circuits; impedance; noise; noise measurement;
fLanguage
English
Journal_Title
Circuits and Systems I: Regular Papers, IEEE Transactions on
Publisher
ieee
ISSN
1549-8328
Type
jour
DOI
10.1109/TCSI.2008.918213
Filename
4447683
Link To Document