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Accession Number:
AD0831021
Title:
A LOW-NOISE FET PREAMPLIFIER FOR WIDE-BAND HYDROPHONES
Corporate Author:
NAVAL UNDERSEA WARFARE CENTER PASADENA CA
Report Date:
1968-03-01
Abstract:
The design of a low-noise, field-effect transistor FET preamplifier is described, and criteria are given for low-noise operation of relevant FET devices. When used in conjunction with a hydrophone having a sensitivity of -80 dBVmicrobar and a capacitance of 60 pF, the design provides a measuring system having a self-noise threshold approximately 10 dB below Sea State 0 from less than 100 Hz to nearly the thermal limit. At the same time, DC bias stability is maintained between 0C and 50C, and voltage gain is 6 dB with frequency response essentially flat from 1 Hz to 1 MHz. Input impedance is approximately 1,000 M ohms at low frequencies, and input capacitance at ultrasonic frequencies is approximately 5 pF.
Descriptive Note:
Development rept.
Supplementary Note:
DOI: 10.21236/AD0831021
Pages:
0020
Distribution Statement:
Approved for public release; distribution is unlimited.
File Size:
1.00MB
