GB1345156A - Electronic analogue calculating circuits - Google Patents

Electronic analogue calculating circuits

Info

Publication number
GB1345156A
GB1345156A GB1345156DA GB1345156A GB 1345156 A GB1345156 A GB 1345156A GB 1345156D A GB1345156D A GB 1345156DA GB 1345156 A GB1345156 A GB 1345156A
Authority
GB
United Kingdom
Prior art keywords
currents
input
circuits
inputs
input currents
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
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.)
DAWNAY FAULKNER ASSOCIATES Ltd
Original Assignee
DAWNAY FAULKNER ASSOCIATES 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.)
Filing date
Publication date
Application filed by DAWNAY FAULKNER ASSOCIATES Ltd filed Critical DAWNAY FAULKNER ASSOCIATES Ltd
Publication of GB1345156A publication Critical patent/GB1345156A/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
    • G06G7/24—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating logarithmic or exponential functions, e.g. hyperbolic functions

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)

Abstract

1345156 Electric analogue calculating DAWNAY FAULKNER ASSOCIATES Ltd 28 May 1971 [8 June 1970] 27585/70 Heading G4G A circuit comprises a plurality of bipolar transistors some of which are of one conductivity types and the others are complementary types, each transistor having its collector-base junction reverse or zero biased so that there is a logarithmic relationship between emitter currents and the base-emitter voltages of the transistors, one or more inputs for input currents and means for obtaining an output current bearing a desired mathematical relationship to the input currents. Fig. 1 shows a circuit in which current Iz represents the product of currents Ix and Iy. Other circuits are described for finding the quotient, square and square root of input currents. Operational amplifiers may be connected across the input circuits to provide virtual earth inputs.
GB1345156D 1971-05-28 1971-05-28 Electronic analogue calculating circuits Expired GB1345156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2758570 1971-05-28

Publications (1)

Publication Number Publication Date
GB1345156A true GB1345156A (en) 1974-01-30

Family

ID=10262039

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1345156D Expired GB1345156A (en) 1971-05-28 1971-05-28 Electronic analogue calculating circuits

Country Status (1)

Country Link
GB (1) GB1345156A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422207A1 (en) * 1978-04-07 1979-11-02 Raytheon Co ELECTRONIC CIRCUIT FOR MULTIPLICATION AND DIVISION OF ANALOGUE SIGNALS
FR2519446A1 (en) * 1982-01-07 1983-07-08 Western Electric Co ANALOG MULTIPLIER CIRCUIT CARRYING OUT INTEGRATED MONOLITHIC FORM

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422207A1 (en) * 1978-04-07 1979-11-02 Raytheon Co ELECTRONIC CIRCUIT FOR MULTIPLICATION AND DIVISION OF ANALOGUE SIGNALS
FR2519446A1 (en) * 1982-01-07 1983-07-08 Western Electric Co ANALOG MULTIPLIER CIRCUIT CARRYING OUT INTEGRATED MONOLITHIC FORM

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees