US3603971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for converting between digital and analog information
Assignee: Applied Biosystems Inc
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Filing: 1968-08-06
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Granted: 1971-09-07
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Expires: 1988-08-06
Abstract
Abstract Apparatus for converting digital information to an analog voltage which includes a transformer having an ordered plurality of windings, all of which are magnetically flux linked and each of which corresponds to a digit of a digital number. Each winding is divided by output taps into a number of equal segments, the number being determined by the base of the digital number. The number of turns in the segments on each winding is determined by the power of the base represented by the digit to which the winding corresponds and by an arbitrary number of turns selected to correspond to the unit value of the digital number. Means are included for supplying an operating potential to one of the windings, preferably that having the largest number of turns. Switching means, adapted to be controlled by digital information, are provided for connecting one input tap on each winding to one end of an adjacent winding. Means for providing an output voltage are connected to one end of the driven winding and the last output tap. preferably the output is connected to the low voltage end of the driven winding and each tap is connected by the switching means to the low voltage end of the next less significant winding.
Inventors
- 👤 Werner Woschetzky
- 👤 Gerard T Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:19
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/66; H03M1/74
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
Apparatus for converting between digital information and analog information comprising: a transformer having an ordered plurality of magnetically fluxlinked windings; each of said windings corresponding to a digit of a digital number of a selected base; each of said windings divided by a plurality of output taps into equal segments, the number of said segments being determined by the base of said digital number; the number of turns in a segment on each of said windings being determined by the power of the base represented by the digit to which said winding corresponds and by an arbitrary number of turns selected to correspond to the unit value of said digital number; means for supplying an alternating potential to one of said windings; digitally controlled switching means responsive to a multidigit electrical control signal representative of a number of said selected base for coupling portions of each of said windings in series to provide a sum of the voltages developed in said portions; and means for connecting said sum of voltages to an output.
Claim 2
Dependent Claim
173 words
Apparatus for converting between digital information and analog information comprising: a transformer having an ordered plurality of magnetically fluxlinked windings; each of said windings corresponding to a digit of a digital number of a selected base; each of said windings divided by a plurality of output taps into equal segments, the number of said segments being determined by the base of said digital number; the number of turns in a segment on each of said windings being determined by the power of the base represented by the digit to which said winding corresponds and by an arbitrary number of turns selected to correspond to the unit value of said digital number; means for supplying an alternating potential to one of said windings; digitally controlled switching means responsive to a multidigit electrical control signal representative of a number of said selected base for coupling portions of each of said windings in series to provide a sum of the voltages developed in said portions; and means for connecting said sum of voltages to an output.
Claim 3
Dependent Claim
21 words
Apparatus as claimed in claim 1, wherein said ordered plurality of windings are wound on a single core of magnetic material.
Claim 4
Dependent Claim
68 words
Apparatus as claimed in claim 1 wherein said switching means comprises means for connecting an output tap on each of said windings to the low voltage end of the next less significant winding in said ordered plurality; and wherein said output is taken across an output tap on the last winding of said ordered plurality and the low voltage end of the first winding of said ordered plurality.
Claim 5
Dependent Claim
51 words
Apparatus as claimed in claim 1 wherein the number of turns in said segments is equal to the product of said number of turns selected to correspond to the unit value and said base of said digital number raised to the power represented by the digit to which said winding corresponds.
Claim 6
Dependent Claim
26 words
Apparatus as claimed in claim 4 wherein the number of output taps on each of said windings is equal to said base of said digital number.
Claim 7
Dependent Claim
46 words
Apparatus as claimed one/five-hundredth claim 5 wherein said switching means comprises means associated with each of said windings controlled by one of a number of input patterns equal to said base for connecting one of said output taps to the next winding in said ordered plurality.
Claim 8
Dependent Claim
20 words
Apparatus as claimed in claim 6 wherein said connecting means is controlled by an input of three binary digital numbers.
Claim 9
Dependent Claim
73 words
Apparatus as claimed in claim 7 wherein: said ordered plurality includes at least three windings; said base of said digital number is eight; the number of turns selected to correspond to said unit value is greater than one; said transformer includes an additional winding for adding fractional parts of the unit values to said sum; and said connecting means for said windings are controlled by an input comprising a plurality of binary digits.
Claim 10
Dependent Claim
84 words
Apparatus as claimed in claim 8 wherein said additional winding included in said transformer is magnetically flux-linked to said ordered plurality; one end of said additional winding being connected to the selected output tap of the last of said ordered plurality of windings; said additional winding having output taps at its low voltage end and at intervals of one turn from said low voltage end to provide for an additional increment of voltage corresponding to a fraction of the unit value in said outPut.
Claim 11
Independent Claim
265 words
A system for converting digital information to an analog voltage comprising: an ordered plurality of transformers; each of said transformers having an ordered plurality of magnetically flux-linked windings; each of said windings corresponding to a digit of a digital number of a selected base; each of said windings divided by a plurality of output taps into equal segments, the number of said segments being determined by the base of said digital number; the number of turns in a segment on each of said windings being determined by the power of the base represented by the digit to which said winding corresponds and by arbitrary number of turns selected to correspond to the unit value of said digital number; means for supplying an alternating potential to one of said windings on a first of said transformers; digitally controlled switching means responsive to a multidigit electrical signal representative of a number of said selected base for coupling portions of each of said windings in series to provide a sum of the voltages developed in said portions; a secondary winding positioned in each superior transformer in said order for supplying power to each inferior transformer in said ordered plurality; the selected output tap on the least significant winding on each superior transformer being connected to one end of the most significant winding on each inferior transformer; and means for providing an output connected to one end of the most significant winding in the first transformer in said ordered plurality and to the selected output tap on the least significant winding of the last transformer in said ordered plurality.
Claim 12
Independent Claim
265 words
A system for converting digital information to an analog voltage comprising: an ordered plurality of transformers; each of said transformers having an ordered plurality of magnetically flux-linked windings; each of said windings corresponding to a digit of a digital number of a selected base; each of said windings divided by a plurality of output taps into equal segments, the number of said segments being determined by the base of said digital number; the number of turns in a segment on each of said windings being determined by the power of the base represented by the digit to which said winding corresponds and by arbitrary number of turns selected to correspond to the unit value of said digital number; means for supplying an alternating potential to one of said windings on a first of said transformers; digitally controlled switching means responsive to a multidigit electrical signal representative of a number of said selected base for coupling portions of each of said windings in series to provide a sum of the voltages developed in said portions; a secondary winding positioned in each superior transformer in said order for supplying power to each inferior transformer in said ordered plurality; the selected output tap on the least significant winding on each superior transformer being connected to one end of the most significant winding on each inferior transformer; and means for providing an output connected to one end of the most significant winding in the first transformer in said ordered plurality and to the selected output tap on the least significant winding of the last transformer in said ordered plurality.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |