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1. WO1996002974 - AN IMPROVEMENT IN AMPLIFIERS

Publication Number WO/1996/002974
Publication Date 01.02.1996
International Application No. PCT/AU1995/000424
International Filing Date 13.07.1995
Chapter 2 Demand Filed 06.02.1996
IPC
H03F 1/02 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F 3/30 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
30Single-ended push-pull amplifiers; Phase-splitters therefor
H03F 3/45 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
45Differential amplifiers
CPC
H03F 1/0244
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
0205in transistor amplifiers
0211with control of the supply voltage or current
0244Stepped control
H03F 2203/45302
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45302the common gate stage of a cascode dif amp being controlled
H03F 2203/45311
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45311the common gate stage of a cascode dif amp being implemented by multiple transistors
H03F 2203/45352
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45352the AAC comprising a combination of a plurality of transistors, e.g. Darlington coupled transistors
H03F 2203/45374
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45374the AAC comprising one or more discrete resistors
H03F 2203/45392
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
2203Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
45Indexing scheme relating to differential amplifiers
45392the AAC comprising resistors in the source circuit of the AAC before the common source coupling
Applicants
  • BHC CONSULTING PTY. LTD. [AU/AU]; c/o Messrs Davies & Shiller 338 Greenhill Road Glenside, S.A. 5065, AU (AllExceptUS)
  • CANDY, Bruce, Halcro [AU/AU]; AU (UsOnly)
Inventors
  • CANDY, Bruce, Halcro; AU
Agents
  • COLLISON & CO.; 117 King William Street Adelaide, S.A. 5000, AU
Priority Data
PM 678413.07.1994AU
PM 687518.07.1994AU
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AN IMPROVEMENT IN AMPLIFIERS
(FR) AMELIORATION AUX AMPLIFICATEURS
Abstract
(EN)
This invention is for an improvement in amplifiers resulting in ultra low distortion. It relates to amplifiers consisting of three stages, an input stage (202) which amplifies an input signal (205) and provides a first signal (209) to an intermediate stage (203) which amplifies the first signal (209) and provides a second signal (403) to an output stage (204) which amplifies that second signal (403) and provides an amplifier output signal (500), the amplifier (200) further including a power supply (201) to provide power to the three stages and wherein the low distortion is achieved by the output stage (204) including output transistors (306) connected to provide the amplifier output signal and further including an error correction means that comprises an input buffer means (301), an adding means (302), a subtracting means (304) and a voltage follower buffer means (305) wherein the adding means sums the second signal with a difference signal (408) to produce an output sum signal (406) the said output sum signal fed to the voltage follower buffer means which then provides a buffered output sum signal (407), which is then fed to the inputs of the output transistors and to the subtracting means, the amplifier output signal is also fed to the subtracting means which is adapted to subtract the amplifier output signal from the buffered output sum signal to produce a difference signal and a first bootstrap power supply (307) to provide power to the error correction means, the bootstrap power supply closely tracking the output signal by means of bootstrapping.
(FR)
L'amélioration aux amplificateurs permet d'obtenir une distorsion ultra faible. Elle concerne des amplificateurs comportant trois étages, à savoir un étage d'entrée (202) qui amplifie un signal d'entrée (205) et fournit un premier signal (209) à un étage intermédiaire (203) qui amplifie le premier signal (209) et qui fournit un second signal (403) à un étage de sortie (204) lequel amplifie ce second signal (403) et fournit un signal de sortie (500). L'amplificateur (200) comprend en outre une alimentation (201) pour fournir l'énergie aux trois étages. La faible distorsion est obtenue par l'incorporation dans l'étage de sortie (204) de transistors de sortie (306) qui produisent le signal de sortie d'un amplificateur et également par l'incorporation de moyens de correction d'erreurs qui consistent en des moyens tampon d'entrée (301), un moyen d'addition (302), un moyen de soustraction (304) et des moyens tampon suiveur de tension (305). Les moyens d'addition additionnent le second signal au signal de différence (408) pour obtenir un signal d'addition de sortie (406) lequel est envoyé aux moyens tampon suiveur de tension qui produisent un signal d'addition de sortie tamponné (407) lequel est ensuite envoyé aux entrées des transistors de sortie puis aux moyens de soustraction. Le signal de sortie de l'amplificateur est également acheminé aux moyens de soustraction lesquels peuvent soustraire le signal de sortie de l'amplificateur du signal d'addition de sortie tamponné afin d'obtenir un signal de différence, et une première alimentation d'amorçage (307) alimente les moyens de correction d'erreurs et suit de près le signal de sortie par amorçage.
Also published as
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