NOISE AND LOW-FREQUENCY AMPLIFIERS

reportActive / Technical Report | Accession Number: AD0476983 | Open PDF

Abstract:

This paper is a study of low-noise amplification in the near direct current frequency range. The paper is a survey of the problem and no ultimate amplifier is presented in conclusion. The purpose of this paper is to analyze the problem and to present conclusions as to best class of amplifiers to use in this frequency range. Two classes of amplifiers are considered. The chopper amplifier and the semiconductor diode parametric amplifier. It is concluded that the semiconductor diode parametric amplifier is inherently the lower noise device of the two. There are no intrinsic noise sources in this amplifier and noise arises mainly from parastic effects which theoretically can be made arbitrarily small. The use of this type of amplifier at low frequencies marks a new and successful application of a device usually associated with microwave frequencies. The first section of the paper is a critique of the various figures of merit used in specifying noise performance. The significance and proper use of the noise figure is discussed. The section on the chopper amplifier includes analysis involving both the junction transistor and the field effect transistor. The conclusions are that the best overall performance of the chopper amplifier results when the junction transistor is used with a low impedance source.

Author(s):
Adler, Michael
Author Organization(s):
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
Descriptive Note:
Technical note
Supplementary Note:
DOI: 10.21236/AD0476983
Pagination:
0058

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release, Document Partially Illegible
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited. Document Partially Illegible.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MIT-TN-1965-52, ESD-TDR-65-588
Contract/Grant Number(s):
AF19(628)-5167, ARPA ORDER-512
Monitor Series:
TDR-65-588, DARPA
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_6_Net Centric; JCA_6.3.3_Spectrum Management; JCA_6.1_Information Transport; JCA_6.3_Net Management
Modernization Areas:
Fully Networked C3
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*PARAMETRIC AMPLIFIERS, *TRANSISTOR AMPLIFIERS, ELECTRICAL IMPEDANCE, EXTREMELY LOW FREQUENCY, IMPEDANCE MATCHING, NOISE(RADIO), SUPERLOW FREQUENCY, THEORY, VARACTOR DIODES
Field(s)/Group(s):
Electrical and Electronic Equipment
Report Date:
1965 Dec 21