Patent US3347871A successfully refreshed from Google Patents.
Patent US3868516A successfully refreshed from Google Patents.
US3868516A
Expired / Lapsed
US
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Dispersion compensated circuitry for analog charged systems
Assignee: Texas Instruments Inc
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Filing: 1973-01-02
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Granted: 1975-02-25
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Expires: 1993-01-02
Abstract
Abstract Circuitry for compensating for charge transfer inefficiency related dispersion in analog charge transfer devices (CTD''s) is disclosed. In one aspect of the invention the tap weights of a filter are modified in a preselected manner to provide dispersion correction. In a different configuration, a dispersion compensating filter is connected to the input of a charge transfer delay line to provide an initial signal which is the inverse of the total dispersion of the bucket brigade. In a further aspect of the invention regenerators are inserted into a bucket brigade delay line to provide negative feedback to previous bits of the delay line in order to compensate for dispersion.
Inventors
- 👤 Dennis Darcy Buss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:58
CPC Classifications
H; H03; H03H; H03H15/00; H03H15/02; G; G11; G11C; G11C27/00; G11C27/04; H10; H10D; H10D84/00; H10D84/891; H10D84/895
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A charge transfer device analog matched filter comprising: an analog shift register having a plurality of storage nodes, said shift register characterized by a determinable charge transfer dispersion; means for simultaneously detecting the signal at each of said storage nodes, said signal characterized by charge transfer dispersion components; dispersion correction means including first signal weighting means connected to said detection means, said filter signal weighting means effective to substantially cancel said charge transfer dispersion components of said detected signals to provide substantially dispersion free signals; second signal amplitude weighting means connected to said dispersion filter for selectively weighting the signal amplitudes of said dispersion free signals to define a preselected filter function; and means for summing said dispersion free weighted signals to provide a correlated output signal substantially free from dispersion.
Claim 2
Dependent Claim
131 words
A charge transfer device analog matched filter comprising: an analog shift register having a plurality of storage nodes, said shift register characterized by a determinable charge transfer dispersion; means for simultaneously detecting the signal at each of said storage nodes, said signal characterized by charge transfer dispersion components; dispersion correction means including first signal weighting means connected to said detection means, said filter signal weighting means effective to substantially cancel said charge transfer dispersion components of said detected signals to provide substantially dispersion free signals; second signal amplitude weighting means connected to said dispersion filter for selectively weighting the signal amplitudes of said dispersion free signals to define a preselected filter function; and means for summing said dispersion free weighted signals to provide a correlated output signal substantially free from dispersion.
Claim 3
Dependent Claim
117 words
A charge transfer analog matched filter as set forth in claim 1 wherein said means for detecting the charge stored at each of said nodes comprises a first insulated gate field effect transistor, the gate electrode of which is operably coupled to said storage node, and wherein said first and second weighting means comprise a second insulated gate field effect transistor, the source to drain circuit of which is connected in series with the source to drain circuit of said first transistor, the gate of said second transistor disposed for receiving a preselected gate supply, the gain of said second transistor defining the combined dispersion correction and filter function weighting coefficients of the detected signal associated therewith.
Claim 4
Dependent Claim
37 words
A charge transfer analog matched filter as set forth in claim 2 wherein said means for selectively defining the gains of said second transistors are effective to define new weighting coefficients Dn in accordance with the expression
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |