GB1348072A – Analogue to digital converters
– Google Patents
GB1348072A – Analogue to digital converters
– Google Patents
Analogue to digital converters
Info
Publication number
GB1348072A
GB1348072A
GB4015371A
GB1348072DA
GB1348072A
GB 1348072 A
GB1348072 A
GB 1348072A
GB 4015371 A
GB4015371 A
GB 4015371A
GB 1348072D A
GB1348072D A
GB 1348072DA
GB 1348072 A
GB1348072 A
GB 1348072A
Authority
GB
United Kingdom
Prior art keywords
analogue
digital value
digital
subtractor
adder
Prior art date
1971-08-26
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4015371A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emerson Process Management Ltd
Original Assignee
Rosemount Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1971-08-26
Filing date
1971-08-26
Publication date
1974-03-13
1971-08-26
Application filed by Rosemount Engineering Co Ltd
filed
Critical
Rosemount Engineering Co Ltd
1974-03-13
Publication of GB1348072A
publication
Critical
patent/GB1348072A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
H03M1/00—Analogue/digital conversion; Digital/analogue conversion
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
H03M1/00—Analogue/digital conversion; Digital/analogue conversion
H03M1/12—Analogue/digital converters
H03M1/50—Analogue/digital converters with intermediate conversion to time interval
Abstract
1348072 Analogue to digital converter ROSEMOUNT ENG CO Ltd 18 Aug 1972 [26 Aug 1971] 40153/71 Heading G4H In an analogue to digital converter in which the digital value is compared with the analogue in a comparator and the comparator output is used to update the digital value; the digital value is converted to a pulse frequency and then either the pulse frequency is converted to an analogue voltage or the analogue voltage to a pulse frequency. The digital value is held in a storage device which may be an up/down counter or a shift register with an adder/subtractor in the recirculation loop feeding signals from the output back to the input of the shift register. As described, the digital value in shift register 14 is continually cycled through adder/subtractor 16 by shift pulses from 19. The digital signal is converted to a signal in which the pulse repetition frequency represents the digital value in circuit 17 and this frequency signal is converted to an analogue voltage in averaging circuit 18. This reference voltage is compared with the analogue input 10 in comparator 11 and the output is integrated at 30 up to either a positive value (trigger 32) or a negative value (trigger 33) depending on the comparator output polarity. The positive trigger output is applied to the add input of adder/subtractor 16. The outputs of both triggers pass to OR gate 34 and thence to AND gate 35 which on receipt of a pulse indicating that the least significant figure of the digital value is in the adder/subtractor, resets the integrator and enables the adder/subtractor so that one is either added to or subtracted from the digital value depending on whether there is an input signal or not respectively. The digital value is thus updated at a rate proportional to the comparator output. In an alternative embodiment both digital and analogue signals are converted to frequency significant pulse trains and are applied to the down and up inputs respectively of a counter acting as comparator.
GB4015371A
1971-08-26
1971-08-26
Analogue to digital converters
Expired
GB1348072A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB4015371
1971-08-26
Publications (1)
Publication Number
Publication Date
GB1348072A
true
GB1348072A
(en)
1974-03-13
Family
ID=10413449
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4015371A
Expired
GB1348072A
(en)
1971-08-26
1971-08-26
Analogue to digital converters
Country Status (3)
Country
Link
US
(1)
US3810151A
(en)
FR
(1)
FR2150548A1
(en)
GB
(1)
GB1348072A
(en)
Families Citing this family (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1512612A
(en)
*
1976-04-01
1978-06-01
Standard Telephones Cables Ltd
Analogue to digital conversion
GB1450989A
(en)
*
1974-03-05
1976-09-29
Standard Telephones Cables Ltd
Analogue to digital converter
US4009475A
(en)
*
1974-12-05
1977-02-22
Hybrid Systems Corporation
Delta-sigma converter and decoder
US6020834A
(en)
*
1997-10-08
2000-02-01
Intel Corporation
System and method for transmitting coded data signals over a bandlimited bus
Family Cites Families (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3201781A
(en)
*
1962-07-23
1965-08-17
Hewlett Packard Co
Analog to digital transducers
US3261012A
(en)
*
1963-03-22
1966-07-12
Westinghouse Electric Corp
Analog to digital conversion system
SE337716B
(en)
*
1964-10-08
1971-08-16
Olivetti & Co Spa
US3509557A
(en)
*
1965-10-18
1970-04-28
Honeywell Inc
Electrical apparatus
US3521269A
(en)
*
1965-12-20
1970-07-21
Ibm
Tracking analog to digital converter
CH461116A
(en)
*
1966-04-12
1968-08-15
Olivetti & Co Spa
Digital position measuring device
US3548169A
(en)
*
1967-03-14
1970-12-15
Fluor Corp
Process controlling digital to analog converter
US3594783A
(en)
*
1969-08-07
1971-07-20
Giddings & Lewis
Apparatus for numerical signaling of positions, including digital-to-analog converter
1971
1971-08-26
GB
GB4015371A
patent/GB1348072A/en
not_active
Expired
1972
1972-08-23
US
US00283088A
patent/US3810151A/en
not_active
Expired – Lifetime
1972-08-28
FR
FR7230509A
patent/FR2150548A1/fr
not_active
Withdrawn
Also Published As
Publication number
Publication date
FR2150548A1
(en)
1973-04-06
US3810151A
(en)
1974-05-07
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Legal Events
Date
Code
Title
Description
1974-07-24
PS
Patent sealed [section 19, patents act 1949]
1985-04-11
PCNP
Patent ceased through non-payment of renewal fee
