EP0829131A1 - Amplificateur a puissance absorbee minimale - Google Patents

Amplificateur a puissance absorbee minimale

Info

Publication number
EP0829131A1
EP0829131A1 EP96914078A EP96914078A EP0829131A1 EP 0829131 A1 EP0829131 A1 EP 0829131A1 EP 96914078 A EP96914078 A EP 96914078A EP 96914078 A EP96914078 A EP 96914078A EP 0829131 A1 EP0829131 A1 EP 0829131A1
Authority
EP
European Patent Office
Prior art keywords
amplifier
stages
gain
amplifier stages
supply
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Withdrawn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
EP96914078A
Other languages
German (de)
English (en)
Inventor
Ralph Oppelt
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.)
Infineon Technologies AG
Original Assignee
Siemens AG
Siemens 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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0829131A1 publication Critical patent/EP0829131A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0277—Selecting one or more amplifiers from a plurality of amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/191—Tuned amplifiers

Definitions

  • the invention relates to an amplifier.
  • Electrical amplifiers are known which are constructed from individual amplifier stages connected in a chain. For example, asymmetrical differential amplifiers or cascode amplifiers are used as the individual amplifier stages of the amplifier (i et ze, Schenk: “Semiconductor switching technology”, Springer Verlag, Berlin 1990, 9th edition, pages 492-494).
  • the individual amplifier stages are supplied by a common or a power supply, each with an operating voltage.
  • the invention is therefore based on the object of specifying an amplifier which draws as little power as possible from a given gain V of the power supply.
  • the amplifier contains a number n> 1 of individual amplifier stages which are electrically connected to one another in chain, each having the same gain V n .
  • V (V n ) n therefore applies to the overall gain V of the amplifier.
  • the invention is based on the knowledge that for a desired overall gain V of the amplifier there is an optimal number n of amplifier stages, each with the same individual gain V n , so that the power consumption of the amplifier is minimal.
  • a computational optimization has shown that this optimal number n from the double inequality
  • Amplifier stages with the same gain V n are Amplifier stages with the same gain V n .
  • the gain V n to be set for each amplifier stage results in accordance with
  • V n V (1 / n) (2)
  • the table below shows the optimal number of stages n for a given total gain V of the amplifier in a range between 1 and 16510 (corresponding to 0 dB to 84.35 dB) based on the relationship (1):
  • each of the individual amplifier stages takes up essentially the same supply power.
  • the upper limit frequency of the transfer function of the amplifier is not influenced when the number n of amplifier stages connected in chain is changed.
  • the same frequency response of the Velcro circuit is thus obtained even with a different number of amplifier stages. Therefore, if one chooses amplifier stages with an essentially identical upper cutoff frequency in an advantageous embodiment, the cutoff frequency of the entire amplifier corresponds to the upper cutoff frequency of each individual amplifier stage.
  • the upper limit frequency of an amplifier or an amplifier stage means the frequency at which the amplification of the amplifier or the amplifier stage has decreased to a predetermined value.
  • the upper limit frequency is chosen to be the - 3dB limit frequency, at which the gain is -3dB lower.
  • All amplifier stages are preferably implemented with the same amplifier circuit in each case.
  • Such an embodiment is technologically particularly easy to integrate in a semiconductor chip.
  • a circuit is preferably chosen as the amplifier circuit for each amplifier stage in which the Miller effect is avoided and a high bandwidth is thus achieved, for example a cascode circuit or an asymmetrical differential amplifier circuit.
  • an emitter circuit in particular with a subsequent emitter follower, a base circuit or an operational amplifier circuit for the amplifier stages, can also be selected.
  • the amplifier according to the invention is preferably monolithically integrated in an IC and can in particular be used to amplify electrical signals in the high-frequency range, for example in a mobile phone or as a preamplifier for the received signals of a transducer element in an applicator (transducer head) of an ultrasound imaging device .
  • the amplifier stages can be controlled.
  • the gain V n of each amplifier stage and thus the overall gain V can then be varied.
  • This embodiment of a controllable amplifier can be used, in particular, for dynamic compression of the received signals from ultrasonic transducer elements in an ultrasonic transducer head as a so-called time gain control amplifier in order to at least partially electro-mechanically damp the delay-dependent attenuation of the reflected ultrasonic pulses in the object under investigation niche balance.
  • the number of stages n of the controllable amplifier then dimensioned according to the gain V, which is most frequently required in order to minimize the power consumed on average.
  • the only figure in the drawing shows an embodiment of an amplifier with three amplifier stages 1, 2 and 3 connected in chain.
  • the amplifications Vi, V 2 and V 3 of the three amplifier stages 1, 2 and 3 are all set identically.
  • the chain connection of the three amplifier stages 1, 2 and 3 is between an input 4 and an output 5 of the
  • the amplifier stages 1, 2 and 3 are supplied by a supply unit (not shown) with a supply voltage (or a supply current) which can be applied to two supply connections 6 and 7 common to the amplifier stages 1, 2 and 3.
  • a supply voltage or a supply current
  • more than just one supply voltage can also be provided, in particular also a separate supply voltage for each amplifier stage 1, 2 and 3. This is particularly advantageous in the case of DC-coupled amplifier stages 1, 2 and 3, in order to avoid a possible shift of the To compensate for resting potentials.
  • the electrical power absorbed by the amplifier corresponds to the product of the supply voltage (operating voltage) applied to the supply connections 6 and 7 and the total supply current (operating current) flowing between these two supply connections 6 and 7 through the amplifier stages 1 to 3. .
  • the power absorbed by the amplifier is equal to the sum of the Products from the individual supply voltages and the associated supply currents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

Le nombre n d'étages d'amplification électriques de structure identique d'un amplificateur est optimisé pour l'obtention d'une amplification totale souhaitée V de l'amplificateur, de telle façon que la puissance absorbée de l'amplificateur soit minimale.
EP96914078A 1995-05-29 1996-05-13 Amplificateur a puissance absorbee minimale Withdrawn EP0829131A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19519625 1995-05-29
DE19519625 1995-05-29
PCT/DE1996/000836 WO1996038906A1 (fr) 1995-05-29 1996-05-13 Amplificateur a puissance absorbee minimale

Publications (1)

Publication Number Publication Date
EP0829131A1 true EP0829131A1 (fr) 1998-03-18

Family

ID=7763115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914078A Withdrawn EP0829131A1 (fr) 1995-05-29 1996-05-13 Amplificateur a puissance absorbee minimale

Country Status (3)

Country Link
EP (1) EP0829131A1 (fr)
JP (1) JPH11505991A (fr)
WO (1) WO1996038906A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018024676A1 (fr) 2016-08-01 2018-02-08 Kurtz Gmbh Injecteur et procédé pour faire fonctionner un injecteur

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8311071D0 (en) * 1983-04-22 1983-05-25 Sinclair Res Ltd Amplifier
TW198152B (fr) * 1990-10-18 1993-01-11 Hitachi Seisakusyo Kk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9638906A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018024676A1 (fr) 2016-08-01 2018-02-08 Kurtz Gmbh Injecteur et procédé pour faire fonctionner un injecteur

Also Published As

Publication number Publication date
JPH11505991A (ja) 1999-05-25
WO1996038906A1 (fr) 1996-12-05

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