NDLI: An 800-MHz monolithic GaAs HBT serrodyne modulator

Content Provider	IEEE Xplore Digital Library
Author	Kushner, L.J. Van Andrews, G. White, W.A. Delaney, J.B. Vernon, M.A. Harris, M.P. Whitmire, D.A.
Copyright Year	1966
Abstract	An 800-MHz monolithic mixed-signal serrodyne modulator IC has been developed in a GaAs/AlGaAs HBT HI/sub 2/L process optimized for digital applications. This 3/spl times/2.8 mm, 2000+ transistor chip consists of a 7-b phase accumulator driving a vector modulator, implemented as a pair of balanced mixers, 5-b switched attenuators, buffer amplifiers, and central circuits. The balanced mixer's LO leakage and 3-1 products are typically 25 dB below the carrier at the nominal operating point, with all other products better than -50 dBc. Over a 32-dB control range, the 5-b switched attenuator typically achieves worst-case amplitude and phase errors of 1.5 dB and 1.5/spl deg/, respectively, from 50-250 MHz. DC-level variations versus attenuator-state limit the spurious response of an 800-MHz Composite DDS based on this serrodyne modulator to -20 dBc. Post-fabrication modeling indicates that a 5/spl deg/C thermal gradient across the IC may be responsible for this undesired dc-level variation. This first generation chip consumes 2.5 W of dc power and clocks to speeds in excess of 925 MHz.<>
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	1041
Ending Page	1050
Page Count	10
File Size	1239593
File Format	PDF
ISSN	00189200
Volume Number	30
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gallium arsenide Heterojunction bipolar transistors Attenuators Integrated circuit modeling Digital modulation Application specific integrated circuits Monolithic integrated circuits Digital integrated circuits Phase modulation Switching circuits
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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