EP0324967A2 - Multiplicateur de pente compensé linéairement - Google Patents

Multiplicateur de pente compensé linéairement Download PDF

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Publication number
EP0324967A2
EP0324967A2 EP88121488A EP88121488A EP0324967A2 EP 0324967 A2 EP0324967 A2 EP 0324967A2 EP 88121488 A EP88121488 A EP 88121488A EP 88121488 A EP88121488 A EP 88121488A EP 0324967 A2 EP0324967 A2 EP 0324967A2
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EP
European Patent Office
Prior art keywords
input
differential amplifier
amplifier
differential
output
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.)
Withdrawn
Application number
EP88121488A
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German (de)
English (en)
Other versions
EP0324967A3 (fr
Inventor
Martin Karl Küng
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0324967A2 publication Critical patent/EP0324967A2/fr
Publication of EP0324967A3 publication Critical patent/EP0324967A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 specially adapted therefor
    • G06G7/16—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor for multiplication or division
    • G06G7/163—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor for multiplication or division using a variable impedance controlled by one of the input signals, variable amplification or transfer function

Definitions

  • control currents for the two differential amplifiers are kept very small or the control currents are of the same size (the control currents here are those which are common through the emitter connections and thus determine the gain determine the currents). As the deviation increases, the non-linearity increases many times with higher values for the control currents.
  • the cause of this disruptive effect is the internal resistance in the emitter that occurs in real transistors, the so-called emitter path resistance (referred to in the English-language literature as emitter bulk resistance).
  • This resistor (R-Eb) acts in principle like an emitter resistor and causes a negative feedback dependent on the product of control current times R-Eb within the two differential amplifiers from "2" and thus dependent transmission characteristics. This means that the transmission characteristics only compensate if the product of control current times R-Eb is the same for both differential amplifiers from "2". Otherwise, a non-linearity depends on the magnitude of the deviation, which causes cubic distortions to occur when AC voltages are used as the input signal.
  • the following cause is responsible for the fact that the compensation of the R-Eb according to FIG. 1 is not 100%:
  • the disturbing negative feedback acts not only for the signals present at the first inputs (A, C) of the two differential amplifiers, but also equally the compensation signals present at the respective second inputs (B, D) and therefore a residual gain error ⁇ V-R remains.
  • the effect of the ⁇ V-R depends on the respective control currents at which the two voltage dividers (Rb1, Rb2 and Rd1, Rd2) are set to the lowest non-linearity and increases with larger maximum values for the two control currents.
  • the compensation of the R-Eb shown in FIG. 2 has an advantage over that shown in FIG.
  • the emitter path resistance compensations shown in FIGS. 1 and 2 also reduce or eliminate the non-linearity of the overall control current gain characteristic, which is also due to the fact that with increasing control currents the negative feedback increases in the two differential amplifiers.

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  • 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)
  • Control Of Amplification And Gain Control (AREA)
EP19880121488 1987-12-23 1988-12-22 Multiplicateur de pente compensé linéairement Withdrawn EP0324967A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT342287A AT392709B (de) 1987-12-23 1987-12-23 Elektronische multiplizierschaltung
AT3422/87 1987-12-23

Publications (2)

Publication Number Publication Date
EP0324967A2 true EP0324967A2 (fr) 1989-07-26
EP0324967A3 EP0324967A3 (fr) 1990-09-26

Family

ID=3550283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880121488 Withdrawn EP0324967A3 (fr) 1987-12-23 1988-12-22 Multiplicateur de pente compensé linéairement

Country Status (2)

Country Link
EP (1) EP0324967A3 (fr)
AT (1) AT392709B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6043768A (en) * 1996-02-16 2000-03-28 Johannes Heidenhain Gmbh Device and method for switching between different operating modes of a transducer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562553A (en) * 1968-10-21 1971-02-09 Allen R Roth Multiplier circuit
US4572975A (en) * 1984-04-02 1986-02-25 Precision Monolithics, Inc. Analog multiplier with improved linearity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6043768A (en) * 1996-02-16 2000-03-28 Johannes Heidenhain Gmbh Device and method for switching between different operating modes of a transducer

Also Published As

Publication number Publication date
AT392709B (de) 1991-05-27
ATA342287A (de) 1990-10-15
EP0324967A3 (fr) 1990-09-26

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