GB1168712A - Method of and Means for Analog to Digital Conversion of a Measured Value. - Google Patents

Method of and Means for Analog to Digital Conversion of a Measured Value.

Info

Publication number
GB1168712A
GB1168712A GB1804967A GB1804967A GB1168712A GB 1168712 A GB1168712 A GB 1168712A GB 1804967 A GB1804967 A GB 1804967A GB 1804967 A GB1804967 A GB 1804967A GB 1168712 A GB1168712 A GB 1168712A
Authority
GB
United Kingdom
Prior art keywords
amplifier
sample
voltage
switch
unit
Prior art date
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
GB1804967A
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.)
Boelkow GmbH
Original Assignee
Boelkow GmbH
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.)
Filing date
Publication date
Application filed by Boelkow GmbH filed Critical Boelkow GmbH
Publication of GB1168712A publication Critical patent/GB1168712A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03M1/34—Analogue value compared with reference values
    • H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
    • H03M1/40—Analogue value compared with reference values sequentially only, e.g. successive approximation type recirculation type

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

1,168,712. Analogue-to-digital converters. BÍLKOW G.m.b.H. 19 April, 1967 [28 April, 1966], No. 18049/67. Heading G4H. [Also in Division H3] An analogue-to-digital converter comprises a first sample and hold unit to store the voltage to be measured, and a second sample and hold unit to store the voltage after comparison with a reference voltage, the second unit having means for subtracting the reference voltge from the input voltage, and means for multiplying by a factor the resulting voltage, the output of the second sample and hold unit being connected to the store of the first, through an amplifier and a switch. A control device controls a number of switches in the converter to cause the signal to circulate through the second unit several times to obtain the required number of digital bits. The first sample and hold unit comprises amplifier 1<SP>1</SP>, electronic switch 2<SP>1</SP>, storage capacitor 3 and output amplifier 4<SP>1</SP> with a very high input impedance. The switch 2<SP>1</SP> comprises a pair of transistors each having a series diode connected to the output of amplifier 1. The transistors are caused to conduct briefly by a pulse applied through a transformer, charging the capacitor 3 to the value of the output of amplifier 1. Amplifier 4 applies this signal to point 5 where it is compared (at 6) with the reference voltage U N and, if greater a " 1 " appears at the output 23 and switch 15 closes to apply the reference voltage to the feed-back loop of the second sample and hold unit 7, 8, 9, 10. The reference voltage is thereby subtracted from the voltage U A at point 5. Resistors 12, 13 also cause the difference to be multiplied by 2 and switch 7 closes briefly to store it. on capacitor 9. This signal U B at point 11 is passed via amplifier 16 and switch 17 (closed by control unit 24) to be stored on capacitor 3 to form a new signal U A . The process repeats under the control of unit 24 to obtain the desired number of digits. In a modification the difference signal is doubled for the first three steps and for the fourth step it is multiplied by 1À25. This is repeated, each group of four digits then representing a binary coded decimal number. The range of the converter can be adjusted by adjusting the reference voltage U N or the amplification factor of the first sample and hold unit.
GB1804967A 1966-04-28 1967-04-19 Method of and Means for Analog to Digital Conversion of a Measured Value. Expired GB1168712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1966B0086901 DE1283367B (en) 1966-04-28 1966-04-28 Method and circuit arrangement for analog-digital conversion of a measured value

Publications (1)

Publication Number Publication Date
GB1168712A true GB1168712A (en) 1969-10-29

Family

ID=6983570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1804967A Expired GB1168712A (en) 1966-04-28 1967-04-19 Method of and Means for Analog to Digital Conversion of a Measured Value.

Country Status (2)

Country Link
DE (1) DE1283367B (en)
GB (1) GB1168712A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149988A (en) * 1983-10-20 1985-06-19 Burr Brown Corp Sampling wave-form digitizer for dynamic testing of high speed data conversion components
GB2270431A (en) * 1992-09-08 1994-03-09 Fujitsu Ltd Voltage storage circuits

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469040A1 (en) * 1979-10-29 1981-05-08 Inst Francais Du Petrole DEVICE FOR AMPLIFYING AND SAMPLING ANALOG SIGNALS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149988A (en) * 1983-10-20 1985-06-19 Burr Brown Corp Sampling wave-form digitizer for dynamic testing of high speed data conversion components
GB2270431A (en) * 1992-09-08 1994-03-09 Fujitsu Ltd Voltage storage circuits
US5384570A (en) * 1992-09-08 1995-01-24 Fujitsu Limited Voltage storage circuits
GB2270431B (en) * 1992-09-08 1997-03-26 Fujitsu Ltd Voltage summation circuitry, voltage doubling circuitry and analog-to-digital converters employing such circuitry
USRE36014E (en) * 1992-09-08 1998-12-29 Fujitsu Limited Voltage storage circuits

Also Published As

Publication number Publication date
DE1283367B (en) 1968-11-21

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