Analog-binary CCD correlator: A VLSI signal processor
Advanced analog-binary CCD correlators will be useful in spread spectrum communications and radar systems employing PRN codes. Increased code-length capability and on-chip support circuitry drive chip size and density into the VLSI domain. Designs of key sections of a 512-stage correlator are discus...
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Published in | IEEE transactions on electron devices Vol. 26; no. 4; pp. 596 - 603 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
IEEE
01.04.1979
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Online Access | Get full text |
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Summary: | Advanced analog-binary CCD correlators will be useful in spread spectrum communications and radar systems employing PRN codes. Increased code-length capability and on-chip support circuitry drive chip size and density into the VLSI domain. Designs of key sections of a 512-stage correlator are discussed. The chip measures nearly 400 by 300 mils and contains all circuits necessary to accept and store a reference code and compare it to a signal. In addition, it contains many support circuits including the clock logic and drivers, code load logic, and TTL-to-MOS converters. Design of the floating-gate tap structure minimizes code-dependent bias, harmonic distortion, and tap-to-tap nonuniformity, while holding power dissipation to 1 mW per tap. Electron-beam lithography was used to produce photomasks with low defect density and tight dimensional tolerances over the array. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0018-9383 1557-9646 |
DOI: | 10.1109/T-ED.1979.19465 |