SEMICONDUCTOR MICROWAVE AMPLITUDE AND PHASE MODULATOR.

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Abstract:

Experiments on the amplitude modulator indicate a linear falloff of modulation depth with drive frequency from 12.5 percent at 0.9 Gcs to 8.4 percent at 1.4 Gcs. It appears from these data that the useful modulation bandwidth of this device in its present configuration falls in the 1 Gcs range. The drive power required to maintain a constant modulation index as the rf carrier power was varied over a three to one range was experimentally determined. A linear relation existed between the drive and carrier power levels. Measurements indicate that the injecting point contact can be represented by a series LCR circuit in shunt with the transmission line. On the basis of this circuit, it is possible to explain the observed decrease in insertion loss with forward bias. The stability of the GaAs varactors was improved by coating the semiconductor surface with a thin film of epoxy. However, the yield was limited, and some electrical deterioration occurred immediately after application of the epoxy coating. Author

Author(s):
Harrison, R. ; Zucker, J. ; Drago, F. ; Fleri, D.
Author Organization(s):
GENERAL TELEPHONE AND ELECTRONICS LABS INC BAYSIDE N Y
Descriptive Note:
Quarterly rept. no 8, 16 Feb-15 May 65,
Supplementary Note:
See also AD-615 328.
Annotation:
Semiconductor microwave amplitude and phase modulator.
Pagination:
0019

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-65-103.8
Contract/Grant Number(s):
DA36 039AMC02284E
Task Number(s):
1P622001A05604
Project Number(s):
1P6 22001A56
 Subject Terms
Communities of Interest:
Advanced Electronics
Descriptor(s):
(*MODULATORS, SEMICONDUCTOR DEVICES), (*SEMICONDUCTOR DEVICES, MODULATORS), MICROWAVE EQUIPMENT, AMPLITUDE MODULATION, PHASE MODULATION, BANDWIDTH, GALLIUM ALLOYS, ARSENIC ALLOYS, NORACTOR DIODES, EPOXY RESINS, PLASTIC COATINGS, FILMS, STABILITY, RADIOFREQUENCY POWER
Keyword(s):
THIN FILMS
Report Date:
1965 May 15