US5493300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit configuration for a D/A and A/D converter
Assignee: Eastman Kodak Co
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Filing: 1994-02-14
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Granted: 1996-02-20
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Expires: 2014-02-14
Abstract
Abstract Using only one R2R network, driven by a digital logic, it is possible to implement both a D/A and A/D converter, An existing stabilized voltage V cc is used instead of a separate reference voltage source. The D/A and A/D converter is calibrated with this voltage and an operational amplifier circuited as a comparator. Starting with the known voltage value V cc and the assigned bit combination, it is possible to measure analog voltages from analog voltage sources using further operational amplifiers circuited as comparators.
Inventors
- 👤 Walter Eiler
- 👤 Ruediger Gertner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:46
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/02; H03M1/10; H03M1/1009; H03M1/1014; H03M1/12; H03M1/34; H03M1/38; H03M1/46; H03M1/66; H03M1/74; H03M1/78; H03M1/785
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
168 words
A digital-to-analog and analog-to-digital converter circuit configuration for a motor driver circuit; said converter circuit configuration comprising: a digital logic having a plurality of inputs and a plurality of outputs; an R2R network having a plurality of inputs interfaced to the outputs of said digital logic and having an output; a plurality of voltage comparators, each comparator having an output respectively connected to one of the inputs of said digital logic, and first and second inputs; an operational amplifier linking the output of said R2R network to the motor driver circuit and to the first inputs of the voltage comparators; a plurality of operating voltage sources, one of said operating voltage sources being connected to the second input of one of said voltage comparators as a reference voltage source for calibration, and those of the operating voltage sources other than the one of said operating voltage sources being respectively connected to the second inputs of those of the voltage comparators other than the one of said voltage comparators.
Claim 2
Dependent Claim
168 words
A digital-to-analog and analog-to-digital converter circuit configuration for a motor driver circuit; said converter circuit configuration comprising: a digital logic having a plurality of inputs and a plurality of outputs; an R2R network having a plurality of inputs interfaced to the outputs of said digital logic and having an output; a plurality of voltage comparators, each comparator having an output respectively connected to one of the inputs of said digital logic, and first and second inputs; an operational amplifier linking the output of said R2R network to the motor driver circuit and to the first inputs of the voltage comparators; a plurality of operating voltage sources, one of said operating voltage sources being connected to the second input of one of said voltage comparators as a reference voltage source for calibration, and those of the operating voltage sources other than the one of said operating voltage sources being respectively connected to the second inputs of those of the voltage comparators other than the one of said voltage comparators.
Claim 3
Dependent Claim
36 words
The digital-to-analog and analog-to-digital converter circuit configuration as defined in claim 1 wherein the operating voltage sources differ in stability, and the most stable of the operating voltage sources is used as said reference voltage source.
Claim 4
Dependent Claim
21 words
The digital-to-analog and analog-to-digital converter circuit configuration as defined in claim 1 wherein said operating voltage sources are analog voltage sources.
Claim 5
Dependent Claim
25 words
The digital-to-analog and analog-to-digital converter circuit configuration as defined in claim 1 wherein each one of said plurality of voltage comparators comprises one operational amplifier.
Claim 6
Independent Claim
169 words
A device for providing an analog output signal and for accepting at least one digital input signal, the device comprising: a) a digital logic circuit having a calibration input, at least one digital input, a control input, and digital control outputs; b) a digital-to-analog converter having digital inputs coupled with the digital control outputs of the digital logic circuit and having an analog output for providing the analog output signal; c) a plurality of comparators including a first comparator and a second comparator, the first comparator having a first input coupled with the analog output of the digital to analog converter, a second input coupled with a reference voltage source, and an output coupled with the calibration input of the digital logic circuit, and the second comparator having a first input coupled with the analog output of the digital to analog converter, a second input provided with an analog sensor signal, and an output coupled with one of the at least one digital input of the digital logic circuit.
Claim 7
Independent Claim
169 words
A device for providing an analog output signal and for accepting at least one digital input signal, the device comprising: a) a digital logic circuit having a calibration input, at least one digital input, a control input, and digital control outputs; b) a digital-to-analog converter having digital inputs coupled with the digital control outputs of the digital logic circuit and having an analog output for providing the analog output signal; c) a plurality of comparators including a first comparator and a second comparator, the first comparator having a first input coupled with the analog output of the digital to analog converter, a second input coupled with a reference voltage source, and an output coupled with the calibration input of the digital logic circuit, and the second comparator having a first input coupled with the analog output of the digital to analog converter, a second input provided with an analog sensor signal, and an output coupled with one of the at least one digital input of the digital logic circuit.
Claim 8
Dependent Claim
54 words
The device of claim 5 further comprising a processor for running a control program, the control program, in conjunction with the processor, controls the digital logic circuit to provide a first type of digital control outputs during a first time slot and a second type of digital control outputs during a second time slot.
Claim 9
Dependent Claim
31 words
The device of claim 6 wherein the first type of digital control outputs is a motor drive output and the second type of digital control outputs is a sensor threshold output.
Claim 10
Dependent Claim
23 words
The device of claim 7 wherein the second time slot occurs during carriage returns and the first time slot occurs between carriage returns.
Claim 11
Dependent Claim
19 words
The device of claim 5 wherein the reference voltage source is a voltage supply for a ink jet head.
Claim 12
Dependent Claim
15 words
The device of claim 5 wherein the digital to analog converter includes an R2R network.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |