GB1347347A - Division system for a computing instrument - Google Patents

Division system for a computing instrument

Info

Publication number
GB1347347A
GB1347347A GB3237271A GB3237271A GB1347347A GB 1347347 A GB1347347 A GB 1347347A GB 3237271 A GB3237271 A GB 3237271A GB 3237271 A GB3237271 A GB 3237271A GB 1347347 A GB1347347 A GB 1347347A
Authority
GB
United Kingdom
Prior art keywords
denominator
amplifier
zero
difference
result
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
GB3237271A
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.)
Sybron Transition Corp
Original Assignee
Sybron Corp
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 Sybron Corp filed Critical Sybron Corp
Publication of GB1347347A publication Critical patent/GB1347347A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division
    • G06G7/163—Arrangements for performing computing operations, e.g. operational amplifiers for multiplication or division using a variable impedance controlled by one of the input signals, variable amplification or transfer function

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

1347347 Electric analogue calculating SYBRON CORP 9 July 1971 [27 Aug 1970] 32372/71 Heading G4G [Also in Division G1] A circuit for dividing analogue electrical signals comprises a differential amplifier 20 providing the difference between the denominator and a sawtooth wave which is used to switch alternately FETs 9, 12 in a negative feedback loop of an amplifier 10 depending on whether the difference is positive or negative, the time for each polarity depends on the magnitude of the denominator and the result of so switching the feedback path is that the average gain of amplifier 10 is inversely proportional to the denominator. Since the numerator is the input of amplifier 10, the output e 0 is proportional to the desired quotient. An amplifier 30 and reference voltage at 33 detect when the denominator is zero and FET 8 is then made to conduct. The components are chosen to give a fixed output when the denominator is zero thereby avoiding the spurious results which would otherwise result.
GB3237271A 1970-08-27 1971-07-09 Division system for a computing instrument Expired GB1347347A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6743570A 1970-08-27 1970-08-27

Publications (1)

Publication Number Publication Date
GB1347347A true GB1347347A (en) 1974-02-27

Family

ID=22075963

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3237271A Expired GB1347347A (en) 1970-08-27 1971-07-09 Division system for a computing instrument

Country Status (4)

Country Link
US (1) US3675003A (en)
CA (1) CA923622A (en)
DE (1) DE2140771A1 (en)
GB (1) GB1347347A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254715A (en) * 1991-07-10 1992-10-14 Kashinath Narayan Dandeker Handling division by zero.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875519A (en) * 1973-12-17 1975-04-01 Sybron Corp Ratio computing circuit
US5049878A (en) * 1981-05-13 1991-09-17 Drexelbrook Engineering Company Two-wire compensated level measuring instrument
US4485673A (en) * 1981-05-13 1984-12-04 Drexelbrook Engineering Company Two-wire level measuring instrument
GB2211968A (en) * 1987-11-04 1989-07-12 Philips Nv Divider circuit e.g. for normalising

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566092A (en) * 1966-04-26 1971-02-23 Industrial Nucleonics Corp Averaging computer
US3525860A (en) * 1966-12-02 1970-08-25 Alfred W Barber Analog multiplying/dividing devices using photoconductive means
US3514700A (en) * 1967-05-15 1970-05-26 Sybron Corp Voltage ratio computer
US3492471A (en) * 1967-10-16 1970-01-27 Honeywell Inc Time division multiplier
US3473043A (en) * 1968-03-25 1969-10-14 Bendix Corp Gain adjustment network for multiplying and dividing input signals
US3517179A (en) * 1968-06-28 1970-06-23 Honeywell Inc Arithmetic circuits for division and square root extraction with field effect transistor in feedback network of amplifier
US3541320A (en) * 1968-08-07 1970-11-17 Gen Electric Drift compensation for integrating amplifiers
US3550022A (en) * 1968-09-04 1970-12-22 Bendix Corp Divider circuit
US3538320A (en) * 1968-10-03 1970-11-03 Us Navy Integrated circuit electronic analog divider with field effect transistor therein
US3502983A (en) * 1968-11-20 1970-03-24 Bell Telephone Labor Inc Signal peak-to-average ratio detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254715A (en) * 1991-07-10 1992-10-14 Kashinath Narayan Dandeker Handling division by zero.
GB2254715B (en) * 1991-07-10 1995-02-22 Kashinath Narayan Dandeker A control switch based on the Boolean false=0/0 and the Boolean true=(not 0)/(not 0)

Also Published As

Publication number Publication date
CA923622A (en) 1973-03-27
US3675003A (en) 1972-07-04
DE2140771A1 (en) 1972-03-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee