Accession Number:

AD0446574

Title:

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

Descriptive Note:

Corporate Author:

GEOTECHNICAL CORP GARLAND TX

Personal Author(s):

Report Date:

1964-07-30

Pagination or Media Count:

51.0

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 cpsmv and a dynamic range greater than 60 db. The various circuits are shown in schematic form and are described.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE