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Last Loaded on Web: Thursday, May 01, 2008
The NTIS: National Technical Information Service database comprises summaries of U.S. government-sponsored research, development, and engineering, plus analyses prepared by federal agencies, their contractors, or grantees. It is the means through which unclassified, publicly available, unlimited distribution reports are made available for sale from agencies such as NASA, DOD, DOE, HUD, DOT, Department of Commerce, and some 240 other agencies. Additionally, some state and local government agencies contribute summaries of their reports to the database. NTIS also provides access to the results of government-sponsored research and development from countries outside the U.S. Organizations that currently contribute to the NTIS database include: the Japan Ministry of International Trade and Industry (MITI); laboratories administered by the United Kingdom Department of Industry; the German Federal Ministry of Research and Technology (BMFT); the French National Center for Scientific Research (CNRS); and many more.
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| DIALOG(R)File 6:NTIS | |
| Comp&distr 2000 NTIS, Intl Copyright All Rights Re. All rts. reserv. | |
| AA=,RN= | 2029987 NTIS Accession Number: AD-D018 520/7/XAB |
| /TI | Sigma-Delta Modulator for Wide Bandwidth Applications |
| (Patent Application) | |
| AU= | Fischer, G. ; Davis, A. J. |
| CS= | Department of the Navy, Washington, DC. |
| CS= | Corp. Source Codes: 001840000; 110050 |
| RN= | Report No.: PAT-APPL-8-854 511 |
| PY= | Filed 12 May 97 21p |
| LA= | Languages: English Document Type: Patent |
| JA= | Journal Announcement: GRAI9801 |
| NT= | This Government-owned invention available for U.S. licensing and, |
| possibly, for foreign licensing. Copy of application available NTIS. | |
| Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. | |
| customers); (703)605-6000 (other countries); fax at (703)321-8547; and | |
| email at orders ntis.fedworld.gov. NTIS is located at 5285 Port Royal | |
| Road, Springfield, VA, 22161, USA. | |
| NTIS Prices: PC N03/MF A04 | |
| CP= | Country of Publication: United States |
| /AB | A wide-band sigma-delta modulator is disclosed having a cascade of two |
| modulators or stages, the first stage being of third or greater order | |
| and the second being of second or greater order. Both stages utilize | |
| simple ternary quantizers to avoid linearity problems associated with | |
| the digital to analog converters in the feedback paths of the modulators | |
| and to maintain stable operation. Additional zeros are placed in the | |
| noise transfer functions of third or higher order stages by means of | |
| additional feed back loops between the output of the third integrator | |
| and the second summing junction to maximize the dynamic range. The new | |
| topology significantly enhances the dynamic range of the system while | |
| hardly affecting the circuit's sensitivity with regard to some | |
| non-idealities such as finite amplifier open-loop gains or capacitor | |
| ratio mismatches. The excess dynamic range gained by these additional | |
| zeros is substantial and independent of OSR, hence, the present | |
| invention is particularly useful in wide-band applications where the OSR | |
| is inherently low. By employing only two cascaded stages, amplifier gain | |
| and capacitor ratio matching requirements are kept reasonably low. | |
| /DE,/DE*, | Descriptors: *Patent applications; *Analog to digital converters; |
| /DF,/DF* | *Digital to analog converters; Signal processing; Signal to noise ratio; |
| Broadband; Dynamic range; Delta modulation | |
| /ID | Identifiers: Sigma delta modulators; NTISGPN |
| SC=,SH=,/SH | Section Headings: 49GE (Electrotechnology--General); 90F (Government |
| Inventions For Licensing--Electrotechnology) |
| SEARCH SUFFIX |
DISPLAY CODE |
FIELD NAME |
INDEXING |
SELECT EXAMPLES |
|---|---|---|---|---|
| None | None | All Basic Index Fields | Word | S WIDE(W)BANDWIDTH |
| /AB | AB | Abstract | Word | S WIDE(W)BAND/AB |
| /DE | DE | Descriptor1 | Word & Phrase |
S DELTA(W)MODULATION/DE S DELTA MODULATION/DE |
| /ID | ID | Identifier2 | Word & Phrase |
S NTISGPN/ID S SIGMA DELTA?/DE |
| /SH | SH | Section Heading3 | Word & Phrase |
S ELECTROTECHNOLOGY/SH S GOVERNMENT INVENTIONS?/SH |
| /TI | TI | Title | Word | S SIGMA(W)DELTA/TI |
3 Searchable in the Basic Index and in the Additional Indexes.
| SEARCH PREFIX |
DISPLAY CODE |
FIELD NAME |
INDEXING |
SELECT EXAMPLES |
|---|---|---|---|---|
| AA= | AA | NTIS Accession Number4,5 | Phrase | S AA=ADD0185207XAB |
| AU= | AU | Author | Phrase | S AU=FISCHER, G. |
| None | AZ | DIALOG Accession Number | ||
| CN= | CN | Contract Number | Word & Phrase |
S CN=(EPA(W)APCO) S CN=W7405ENG48 S CN=W-7405-ENG-48 |
| CP= | CP | Country of Publication | Word & Phrase |
S CP=(UNITED(W)STATES) S CP=UNITED STATES |
| CS= | CS | Corporate Source | Word & Phrase |
S CS=(DEPARTMENT(2W)NAVY) S CS=DEPARTMENT OF THE? S CS=110050 |
| DT= | DT | Document Type | Phrase | S DT=PATENT |
| JA= | JA | Journal Announcement | Phrase | S JA=GRAI9801 |
| LA= | LA | Language | Phrase | S LA=ENGLISH |
| NT= | NT | Note | Word | S NT=(FOREIGN(W)LICENSING) |
| None | PC | NTIS Price Code | ||
| PY= | PY | Publication Year11 | Phrase | S PY=1997 |
| RN= | RN | CAS(R) Registry Number8 | Phrase | S RN=8001-35-2 |
| RN= | RN | Report Number6,7 | Word & Phrase |
S RN=(AD(W)D018(W) 520) S RN=PATAPPL8854511 S RN=PAT-APPL-8-854 511 |
| SC= | SC | Section Heading Code9 | Phrase | S SC=90F |
| SH= | SH | Section Heading3 | Phrase | S SH=ELECTROTECHNOLOGY? S SH=49GE |
| None | SO | Source Information10 | ||
| SP= | SP | Sponsoring Organization | Word & Phrase |
S SP=(DEPARTMENT(1W)ENERGY) S SP=DEPARTMENT OF ENERGY? |
| UD= | None | Update | Phrase | S UD=9999 |
4 Do not use any space or punctuation.
6 Includes NTIS Accession Numbers which are also searchable using AA=
7 Includes some patent information and ISBN.
8 For records from 1980 forward.
10 Display information varies according to type of document.
| Sets and terms can be restricted by Basic Index suffixes, i.e. /AB, /DE, /DE*, /DF, /DF*, /ID, /ID*, /IF, /IF*, /SH, /TI (e.g., S S3/DE), as well as by the following features: | ||
| SUFFIX | FIELD NAME | EXAMPLES |
|---|---|---|
| / | DIALOG Accession Number | S S3/1219216-9999999 |
| /ENG | English-Language Documents | S S10/ENG |
| /MAJ | Major Descriptor or Identifier | S S1/MAJ |
| /NONENG | Non-English Language Documents | S S19/NONENG |
| /YYYY | Publication Year | S S4/1997 |
| SORTABLE FIELDS | EXAMPLES |
|---|---|
| AA, AU, CN, CS, PY, RN, SP, TI | SORT S3/ALL/AU SORT S1/ALL/PY/D |
| RANK FIELDS | EXAMPLES |
|---|---|
| All phrase- and numeric-indexed fields in the Additional Indexes can be ranked. Other RANK codes include: DE, ID | RANK AU S3 RANK DE S2 |
| Display codes listed in the Search Options tables can be used to customize output. | TYPE S3/TI,JN,PY/1-5 PRINT S2/TI,AB/ALL |
| NO. |
DIALOGWEB FORMAT |
RECORD CONTENT |
|---|---|---|
| 1 | -- | DIALOG Accession Number |
| 2 | -- | Full Record except Abstract |
| 3 | Medium | Bibliographic Citation |
| 4 | -- | Full Record with Tagged Fields |
| 5 | -- | Full Record |
| 6 | Short | Title, NTIS Accession Number, and Publication Year |
| 7 | Long | Bibliographic Citation and Abstract |
| 8 | Free | Title, Indexing, NTIS Accession Number, and Publication Year |
| 9 | Full | Full Record |
| K | -- | KWIC (Key Word In Context) displays a window of text; may be used alone or with other formats |
| FIELD NAME | EXAMPLES | ||
|---|---|---|---|
| If the accession number of a specific record is known, it can be used to display the record directly. | TYPE 1254950/3 DISPLAY 121562/TI,AU PRINT 125552/9 |
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