WO2002050999A1 - Power amplifier - Google Patents

Power amplifier Download PDF

Info

Publication number
WO2002050999A1
WO2002050999A1 PCT/IB2001/002200 IB0102200W WO0250999A1 WO 2002050999 A1 WO2002050999 A1 WO 2002050999A1 IB 0102200 W IB0102200 W IB 0102200W WO 0250999 A1 WO0250999 A1 WO 0250999A1
Authority
WO
WIPO (PCT)
Prior art keywords
power amplifier
negative feedback
output
enveloped
distortions
Prior art date
Application number
PCT/IB2001/002200
Other languages
French (fr)
Inventor
Eugene Sergeyevich Aleshin
Original Assignee
Eugene Sergeyevich Aleshin
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 Eugene Sergeyevich Aleshin filed Critical Eugene Sergeyevich Aleshin
Priority to PCT/IB2001/002200 priority Critical patent/WO2002050999A1/en
Priority to EP01982666A priority patent/EP1350315A1/en
Priority to AU2002214207A priority patent/AU2002214207A1/en
Publication of WO2002050999A1 publication Critical patent/WO2002050999A1/en

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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/307—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in push-pull amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3069—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output
    • H03F3/3076—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output with symmetrical driving of the end stage

Definitions

  • This invention relates to devices for amplification of electric signals and more particularly, to power amplifiers.
  • a drawback of this power amplifier is signal lateness of the negative feedback on high frequency that causes to distortion of input signal and increasing of a power amplifier output resistance.
  • the object of this invention is reducing of distortions and output resistance in a power amplifier in the wide operating frequency.
  • the object is achieved by so that in well known power amplifier comprising the input and output stage enveloped with the negative feedback, in addition the local active negative feedback is lead which lets to stabilize the bias voltage of the output stage and thus, lets to reduce distortions and the output voltage in the wide operating frequency of a power amplifier.
  • An accordance of the preferred technical embodiment to the criterion "positive effect" is determined by so that well known device-prototype in addition is enveloped with the local active negative feedback, that lets to stabilize the bias voltage of the output stage and thus, to reduce distortions and the output resistance of a power amplifier in the wide operating frequency.
  • Figure is one of variations for embodiment of a preferred power amplifier. It is proposed to provide a power amplifier comprising the positive and negative inputs 1 and 2, the first and second input transistors 3 and 4, the third and fourth output transistors 5 and 6, the first and second resistors 7 and 8 of the negative feedback and the output 9.
  • a power amplifier functions as follows:
  • An input signal comes to the positive or negative inputs 1 and 2 of a power amplifier in which the input is amplified and comes to the output 9. Besides, an amplifying signal comes from the output 9 through the resistors 7 and 8 of the negative feedback to corresponding leads the input transistors 3 and 4, closing thus, a circuit of the local negative feedback with the help of which the bias voltage is stabilized and as a result of that distortions and the output resistance of a power amplifier are reduced.
  • a proposed power amplifier in comparison with well known in addition is enveloped with the local active negative feedback which stabilizes the bias voltage of the output stage of a power amplifier, that lets to reduce distortions of an output signal and output resistance of a power amplifier in the wide operating frequency.

Landscapes

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

Abstract

The invention relates to devices to amplify electric signals and more particularly, to power amplifiers. The object of the invention is reduction of distortions and the output resistance in power amplifiers in the wide operating frequency. The object is achieved by so in this power amplifier comprising input and output stages, enveloped with the total negative feedback, in addition the local active negative feedback is lead, that lets to stabilize hard the bias voltage of the output stage of a power amplifier, that cases to reduction of distortions and the output resistance in the wide operating frequency.

Description

Power amplifier
This invention relates to devices for amplification of electric signals and more particularly, to power amplifiers.
It is known a power amplifier described in Copyright of the USSR No.1443128, H03F3/26 comprising the input and output stage enveloped with the total negative feedback.
A drawback of this power amplifier is signal lateness of the negative feedback on high frequency that causes to distortion of input signal and increasing of a power amplifier output resistance.
The object of this invention is reducing of distortions and output resistance in a power amplifier in the wide operating frequency.
The object is achieved by so that in well known power amplifier comprising the input and output stage enveloped with the negative feedback, in addition the local active negative feedback is lead which lets to stabilize the bias voltage of the output stage and thus, lets to reduce distortions and the output voltage in the wide operating frequency of a power amplifier.
A presence of a feature in the preferred device, characterised it from the prototype, namely: "... this one is enveloped in addition with the local active negative feedback determines an accordance of the preferred technical embodiment to the criterion "novelty".
For checking the preferred technical embodiment to accord to the criterion "essential distinctions" its distinguish features had been compared with features of well known technical embodiments which showed, that in one of them had been used such feature as: "... this one is enveloped in addition with the local active negative feedback that lets to draw a conclusion about an accordance of the preferred technical embodiment to the criterion "essential distinctions".
An accordance of the preferred technical embodiment to the criterion "positive effect" is determined by so that well known device-prototype in addition is enveloped with the local active negative feedback, that lets to stabilize the bias voltage of the output stage and thus, to reduce distortions and the output resistance of a power amplifier in the wide operating frequency.
Figure is one of variations for embodiment of a preferred power amplifier. It is proposed to provide a power amplifier comprising the positive and negative inputs 1 and 2, the first and second input transistors 3 and 4, the third and fourth output transistors 5 and 6, the first and second resistors 7 and 8 of the negative feedback and the output 9.
A power amplifier functions as follows:
An input signal comes to the positive or negative inputs 1 and 2 of a power amplifier in which the input is amplified and comes to the output 9. Besides, an amplifying signal comes from the output 9 through the resistors 7 and 8 of the negative feedback to corresponding leads the input transistors 3 and 4, closing thus, a circuit of the local negative feedback with the help of which the bias voltage is stabilized and as a result of that distortions and the output resistance of a power amplifier are reduced.
A proposed power amplifier in comparison with well known in addition is enveloped with the local active negative feedback which stabilizes the bias voltage of the output stage of a power amplifier, that lets to reduce distortions of an output signal and output resistance of a power amplifier in the wide operating frequency.

Claims

Claim
A power amplifier, comprising input and output stages, enveloped with the total negative feedback, characterised in that in addition this one is enveloped with the local active negative feedback.
PCT/IB2001/002200 2000-12-18 2001-11-14 Power amplifier WO2002050999A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/IB2001/002200 WO2002050999A1 (en) 2001-11-14 2001-11-14 Power amplifier
EP01982666A EP1350315A1 (en) 2000-12-18 2001-11-14 Power amplifier
AU2002214207A AU2002214207A1 (en) 2000-12-18 2001-11-14 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2001/002200 WO2002050999A1 (en) 2001-11-14 2001-11-14 Power amplifier

Publications (1)

Publication Number Publication Date
WO2002050999A1 true WO2002050999A1 (en) 2002-06-27

Family

ID=11004212

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/002200 WO2002050999A1 (en) 2000-12-18 2001-11-14 Power amplifier

Country Status (3)

Country Link
EP (1) EP1350315A1 (en)
AU (1) AU2002214207A1 (en)
WO (1) WO2002050999A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53144237A (en) * 1977-05-23 1978-12-15 Hitachi Ltd Differential amplifier
US4374363A (en) * 1980-11-03 1983-02-15 Previti Frank R Balanced impedance coupler
US4422050A (en) * 1980-07-09 1983-12-20 Nippon Gakki Seizo Kabushiki Kaisha Single-ended push-pull amplifier with two complementary push-pull circuits
US4510459A (en) * 1982-11-10 1985-04-09 Sony Corporation Wideband record amplifier
US4511857A (en) * 1982-09-17 1985-04-16 Gunderson Steven J Output following intermediate cascode circuit
US4638260A (en) * 1984-09-21 1987-01-20 Hamley James P Audio amplifier
US5914639A (en) * 1997-04-04 1999-06-22 Thomson-Csf Amplifier with common base input stage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53144237A (en) * 1977-05-23 1978-12-15 Hitachi Ltd Differential amplifier
US4422050A (en) * 1980-07-09 1983-12-20 Nippon Gakki Seizo Kabushiki Kaisha Single-ended push-pull amplifier with two complementary push-pull circuits
US4374363A (en) * 1980-11-03 1983-02-15 Previti Frank R Balanced impedance coupler
US4511857A (en) * 1982-09-17 1985-04-16 Gunderson Steven J Output following intermediate cascode circuit
US4510459A (en) * 1982-11-10 1985-04-09 Sony Corporation Wideband record amplifier
US4638260A (en) * 1984-09-21 1987-01-20 Hamley James P Audio amplifier
US5914639A (en) * 1997-04-04 1999-06-22 Thomson-Csf Amplifier with common base input stage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 003, no. 017 (E - 090) 14 February 1979 (1979-02-14) *

Also Published As

Publication number Publication date
EP1350315A1 (en) 2003-10-08
AU2002214207A1 (en) 2002-07-01

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