US3894212A - Analog power computer - Google Patents

Analog power computer Download PDF

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Publication number
US3894212A
US3894212A US449910A US44991074A US3894212A US 3894212 A US3894212 A US 3894212A US 449910 A US449910 A US 449910A US 44991074 A US44991074 A US 44991074A US 3894212 A US3894212 A US 3894212A
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US
United States
Prior art keywords
contact
selector switch
terminal
power value
input
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 - Lifetime
Application number
US449910A
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English (en)
Inventor
David R Figueroa
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.)
Coulter Electronics Inc
Original Assignee
Coulter Electronics Inc
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 Coulter Electronics Inc filed Critical Coulter Electronics Inc
Priority to US449910A priority Critical patent/US3894212A/en
Priority to FR7506729A priority patent/FR2264325A1/fr
Priority to DE19752509551 priority patent/DE2509551A1/de
Application granted granted Critical
Publication of US3894212A publication Critical patent/US3894212A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G06G7/20—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating powers, roots, polynomes, mean square values, standard deviation

Definitions

  • FIG. 1 A first figure.
  • the invention herein is concerned with the problem of how to electronically determine exponential values of a given quantity.
  • the present invention has the object of providing circuitry and elements for electronically determining in a simple manner power values regardless of whether the values are of the integral or fractional type.
  • the invention is aimed at solving the problem of producing any power value of a given quantity by modifying the structure of the above noted patent through the provision of two special switching devices each having a number of contact terminals, equaling the number of integrators employed.
  • the number of integrators equal the highest order of either numerator or the denominator of the desired power value.
  • One switch serves for setting thereon the numerator figures, the other switch serves the denominator figures.
  • the terminals of both switching devices are connected in parallel to the outputs of the respective integrators.
  • the numerator switch is coupled to receive the input quantum.
  • the denominator switch is connected to the output of the apparatus, where the desired power value is obtainable.
  • FIG. 1 is a schematic diagram of a mathematical computer including circuitry and elements for determining root values, as disclosed in applicants noted prior U.S. Pat. No. 3,679,884;
  • FIG. 2 is a schematic diagram of a computer of power values according to the invention.
  • FIG. 1 being a reproduction of the drawing in the above noted US patent, represents a circuit which is particularly structured for determining cube root values.
  • the circuit furthermore comprises a comparator 35, a summing junction including resistors 43, 44 and also a groundedresistor 45. Finally a control circuit 37 is provided for controlling the operations.
  • a reference voltage V is supplied to the first input terminal of switch 25, and a quantum input voltage V representing the mathematical magnitude to be cube rooted isapplied to the summing junction.
  • the theory, mathematical derivations and operations of the circuit of FIG. 1 are described in detail in the above mentioned patent and do not have to be repeated here.
  • I Y I The present invention provides circuitry and elements for determining any desired power value of integral or fractional type of any given mathematic magni- I tude.
  • the computer of the instant invention is, just as in the case of the prior patent. based on the use of a plurality of integrators.
  • the integrators are indicated, by way of example, by four amplifiers 101, 102, 103 and 104. Also, comparator and control circuits are provided which are arranged in a manner identical'to'the circuit in FIG. 1.
  • V g V g
  • the number of integrators shown in FIG. '2 have been chosen to be four for convenient illustration, butany other number of integrators may be employed.
  • the outputs of the amplifiers 101, 102, 103 and 104 are led over lines 109, 110, 111 and 112 to contact terminals 1, 2, 3 and 4 respectively of a switching device 116 which is also designated by the letter N.
  • the outputs of the amplifiers 101, 102, 103 and 104 are also led through nodes 105, 106, 107 and 108, i.e. in parallel to above connections 109 to 112 over lines 119, 120, 121 and 122 respectively to contact terminals -1', 2', 3 and 4', of a second switching device 126 which is also designated by the letter D.
  • An arm 131 is supported in the center 133 of the switching device 116 and capable of rotating and moving in sliding engagement over the contact terminals 1, 2, 3 or 4, making electric contact with any one of them.
  • a line 138 connects the center 133 of the switching device 116 with an output terminal 135.
  • an arm 141 is supported in the center 143 of the switching device 126 and capable of rotating.
  • the center of switch 126 is connected, in a fashion similar to that of FIG. 1, over a line 33 to a summing junction comprising a node 42 and resistors 43 and 44.
  • the resistor 44 receives at a terminal 145 a voltage input quantum V,,,-, wherein V represents a mathematic magnitude which is to be raised to a certain power.
  • a block 35, 37 marked Comparator and Control represents circuitry of identical structure and function as the comparator 35 and control block 37 in the circuit of FIG. 1.
  • resistors R R R fcapacitors C C C input switches 25, 29, 31, parallel switches 26, 30 and 32, and the electrical connections therebetween are also present in the device of FIG. 2 cooperating with the amplifiers 101, 102, 103 and 104, but have been omitted in the drawing for the sake of clarity.
  • the opera-' tor will apply the voltage reference to the terminal 100 and the input quantum to terminal '145.
  • the desired power value will be obtainable at the output terminal 135, namely V 3/2.
  • the last example may be used to illustrate the operation of the circuit in case where an integral power is desired, as contrasted to a fractional power value.
  • the D-arm would be set once and for all on contact 1, and only the N"-arm would be moved around contacts 2, or 3 or 4 depending upon whether the second, third or fourth power is desired.
  • A a plurality of integrators connected in series to one another
  • G the number of integrators equaling the higher of the components of the power value
  • H comparing means coupled to the first selector switch means for i a. comparing a voltage prevailing at the selected position of the first selector switch means with said input quantum
  • control circuitmeans coupled to said -means, said control circuit-means constructed to receive said characteristic output and control the operations of the apparatus,-including start and reset means, I 1 wherein, upon the selector switch means beingninvthe selected positions, the reference voltage and the input quantum being at said first and second terminal means,.
  • c. means associated with the second contact arm for I selectively establishing contact with any of the second contact terminals.
  • the comparing means comprises an input summing junction including two resistors connected in parallel to an input of the comparing means coupled to receive the output from the first selector switch arm and the input quanturn.

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  • 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)
  • Measurement Of Current Or Voltage (AREA)
  • Analogue/Digital Conversion (AREA)
US449910A 1974-03-11 1974-03-11 Analog power computer Expired - Lifetime US3894212A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US449910A US3894212A (en) 1974-03-11 1974-03-11 Analog power computer
FR7506729A FR2264325A1 (lt) 1974-03-11 1975-03-04
DE19752509551 DE2509551A1 (de) 1974-03-11 1975-03-05 Elektronische einrichtung zur ermittlung von exponentialwerten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US449910A US3894212A (en) 1974-03-11 1974-03-11 Analog power computer

Publications (1)

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US3894212A true US3894212A (en) 1975-07-08

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US449910A Expired - Lifetime US3894212A (en) 1974-03-11 1974-03-11 Analog power computer

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US (1) US3894212A (lt)
DE (1) DE2509551A1 (lt)
FR (1) FR2264325A1 (lt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939688A (en) * 1987-04-01 1990-07-03 U.S. Philips Corp. Dynamic range converter providing a multiplicity of conversion ratios

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043516A (en) * 1959-10-01 1962-07-10 Gen Electric Time summing device for division, multiplication, root taking and interpolation
US3383501A (en) * 1964-10-27 1968-05-14 Honeywell Inc Arithmetic circuit for multiplying and dividing
US3521046A (en) * 1968-02-06 1970-07-21 Lear Siegler Inc Analog computer circuit for multiplication or division
US3676661A (en) * 1970-05-05 1972-07-11 James A Sprowl Voltage-time-voltage computation circuit using r-c exponential decay circuits to perform multiplication, division, root-finding and logarithmic conversion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043516A (en) * 1959-10-01 1962-07-10 Gen Electric Time summing device for division, multiplication, root taking and interpolation
US3383501A (en) * 1964-10-27 1968-05-14 Honeywell Inc Arithmetic circuit for multiplying and dividing
US3521046A (en) * 1968-02-06 1970-07-21 Lear Siegler Inc Analog computer circuit for multiplication or division
US3676661A (en) * 1970-05-05 1972-07-11 James A Sprowl Voltage-time-voltage computation circuit using r-c exponential decay circuits to perform multiplication, division, root-finding and logarithmic conversion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939688A (en) * 1987-04-01 1990-07-03 U.S. Philips Corp. Dynamic range converter providing a multiplicity of conversion ratios

Also Published As

Publication number Publication date
FR2264325A1 (lt) 1975-10-10
DE2509551A1 (de) 1975-09-25

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