Accession Number : AD0446574


Title :   LOW-LEVEL, LOW-FREQUENCY, SOLID-STATE AMPLIFIER


Corporate Author : GEOTECHNICAL CORP GARLAND TX


Personal Author(s) : Keele, James E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/446574.pdf


Report Date : 30 Jul 1964


Pagination or Media Count : 51


Abstract : This report describes the development of a lowlevel, low-frequency, all-solid-state amplifier having either analog, broad-band FM, or IRIG FM output. The amplifier was developed primarily for amplification of seismic signals in geographic areas where the low-noise detection capability of a phototube amplifier is not required. The equivalent-input noise level for a passband of 0. 1 to 5 cps is 1 x 10 minus 6 v. This is equal to 2 x 10 minus 16 w in the 5 k ohm input resistor. Signal common-mode rejection is 86 db and the effects of power-supply variation are negligible. Power requirements are less than 1 w. Operating temperature is from -60 to +60 C. By using a special filter, the amplifier is capable of operation over a passband of 0. 01 cps to 40 kc. Using analog output, the amplifier has a voltage gain of 10,000 and a dynamic range of 57 db. Using broad-band FM carrier output, it has a modulation sensitivity of 465 cps/mv and a dynamic range greater than 60 db. The various circuits are shown in schematic form and are described.


Descriptors :   *TRANSISTOR AMPLIFIERS , ANALOG SYSTEMS , BANDPASS FILTERS , BROADBAND , FREQUENCY MODULATION , FULL WAVE RECTIFIERS , GAIN , POWER SUPPLIES , PREAMPLIFIERS , TRANSISTORS , VOLTAGE


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE