US3582940A
Expired / Lapsed
US
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Analogue-to-digital converter
Assignee: Jungner Instrument AB
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Filing: 1967-11-13
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Granted: 1971-06-01
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Expires: 1987-11-13
Abstract
Abstract An analog-to-digital converter is disclosed which is capable of handling, in time-multiplexed fashion, a number of analog input signals. A code generator generates a frame of pulses which include all possible digital outputs. Each analog signal is compared with comparison reference voltage which is synchronized in time with the code generator output. A differential amplifier produces a pulse which commences when the comparison voltage and analog signal are equal in magnitude. This pulse is then utilized to select the correct digital output, from the frame of pulses generated by the code generator, which corresponds to the magnitude of the analog signal.
Inventors
- 👤 Gunnar Axel Kihlberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:33
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
227 words
An analogue-to-digital converter comprising a code voltage generator, said code voltage generator comprising a digital counter counting continuously up and down in periodic cycles and producing a combination of output code voltages representing the digital count of the counter, a comparison voltage generator producing a cyclic comparison voltage of substantially constant slope, said comparison voltage generator being synchronized with said code voltage generator so that the instantaneous value of said comparison voltage corresponds to a predetermined combination of code voltages, a plurality of differential amplifiers each having one input connected to receive said comparison voltage delivered by said comparison voltage generator, another input connected to receive an analog signal to be converted to digital form, each of said differential amplifiers producing a pulse commencing when said comparison voltage and said analog signal are equal, selector means to pass only one of said pulses to a memory, means for connecting the output of said code voltage generator to said memory, and means connecting the output of said selector means to said memory, which operates to store the digital count of said counter, corresponding to the starting point of said one pulse, said last-named means including a gate circuit operative to pass said one pulse to said memory when the output of said code voltage generator is significant and when said comparison voltage and said analog signal are equal.
Claim 2
Dependent Claim
227 words
An analogue-to-digital converter comprising a code voltage generator, said code voltage generator comprising a digital counter counting continuously up and down in periodic cycles and producing a combination of output code voltages representing the digital count of the counter, a comparison voltage generator producing a cyclic comparison voltage of substantially constant slope, said comparison voltage generator being synchronized with said code voltage generator so that the instantaneous value of said comparison voltage corresponds to a predetermined combination of code voltages, a plurality of differential amplifiers each having one input connected to receive said comparison voltage delivered by said comparison voltage generator, another input connected to receive an analog signal to be converted to digital form, each of said differential amplifiers producing a pulse commencing when said comparison voltage and said analog signal are equal, selector means to pass only one of said pulses to a memory, means for connecting the output of said code voltage generator to said memory, and means connecting the output of said selector means to said memory, which operates to store the digital count of said counter, corresponding to the starting point of said one pulse, said last-named means including a gate circuit operative to pass said one pulse to said memory when the output of said code voltage generator is significant and when said comparison voltage and said analog signal are equal.
Claim 3
Dependent Claim
203 words
An analogue-to-digital converter comprising, a code voltage generator producing in time sequence a frame of digital output signals corresponding to all of the possible digital outputs, a comparison voltage generator synchronized with said code voltage generator producing a comparison voltage of substantially constant slope, a plurality of differential amplifiers, means for applying said comparison voltage to each of said differential amplifiers, means for applying a plurality of analog signals to said plurality of differential ampliFiers, said means applying each of said plurality of analog signals to one of said plurality of differential amplifiers, each of said differential amplifiers producing a pulse commencing when said comparison voltage and said analog signal are equal, a memory, means for applying the output of said code voltage generator to said memory, selector means to pass only one of said pulses to a gating means, said gating means enabled by said one pulse for storing in said memory the digital output of said code voltage generator when said pulse commences, said gating means receiving a synchronizing signal from said code voltage generator, said gating means passing said one pulse only when said digital output signals are significant and when said comparison voltage and said analog signal are equal.
Claim 4
Dependent Claim
203 words
An analogue-to-digital converter comprising, a code voltage generator producing in time sequence a frame of digital output signals corresponding to all of the possible digital outputs, a comparison voltage generator synchronized with said code voltage generator producing a comparison voltage of substantially constant slope, a plurality of differential amplifiers, means for applying said comparison voltage to each of said differential amplifiers, means for applying a plurality of analog signals to said plurality of differential ampliFiers, said means applying each of said plurality of analog signals to one of said plurality of differential amplifiers, each of said differential amplifiers producing a pulse commencing when said comparison voltage and said analog signal are equal, a memory, means for applying the output of said code voltage generator to said memory, selector means to pass only one of said pulses to a gating means, said gating means enabled by said one pulse for storing in said memory the digital output of said code voltage generator when said pulse commences, said gating means receiving a synchronizing signal from said code voltage generator, said gating means passing said one pulse only when said digital output signals are significant and when said comparison voltage and said analog signal are equal.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |