ATE940T1 - MICROPHONE AMPLIFIERS, PARTICULARLY FOR TELEPHONE EQUIPMENT. - Google Patents

MICROPHONE AMPLIFIERS, PARTICULARLY FOR TELEPHONE EQUIPMENT.

Info

Publication number
ATE940T1
ATE940T1 AT79104040T AT79104040T ATE940T1 AT E940 T1 ATE940 T1 AT E940T1 AT 79104040 T AT79104040 T AT 79104040T AT 79104040 T AT79104040 T AT 79104040T AT E940 T1 ATE940 T1 AT E940T1
Authority
AT
Austria
Prior art keywords
telephone equipment
microphone amplifiers
amplifiers
microphone
telephone
Prior art date
Application number
AT79104040T
Other languages
German (de)
Inventor
Horst Dipl.-Ing. Kraemer
Original Assignee
Siemens Aktiengesellschaft Berlin Und Muenchen
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 Aktiengesellschaft Berlin Und Muenchen filed Critical Siemens Aktiengesellschaft Berlin Und Muenchen
Application granted granted Critical
Publication of ATE940T1 publication Critical patent/ATE940T1/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
    • H03F3/45085—Long tailed pairs
    • H03F3/45094—Folded cascode stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
AT79104040T 1978-11-23 1979-10-18 MICROPHONE AMPLIFIERS, PARTICULARLY FOR TELEPHONE EQUIPMENT. ATE940T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782850792 DE2850792A1 (en) 1978-11-23 1978-11-23 MICROPHONE AMPLIFIER, ESPECIALLY FOR TELEPHONE SYSTEMS
EP79104040A EP0011705B1 (en) 1978-11-23 1979-10-18 Microphone amplifier, in particular for telephone installations

Publications (1)

Publication Number Publication Date
ATE940T1 true ATE940T1 (en) 1982-05-15

Family

ID=6055415

Family Applications (1)

Application Number Title Priority Date Filing Date
AT79104040T ATE940T1 (en) 1978-11-23 1979-10-18 MICROPHONE AMPLIFIERS, PARTICULARLY FOR TELEPHONE EQUIPMENT.

Country Status (7)

Country Link
US (1) US4295100A (en)
EP (1) EP0011705B1 (en)
AR (1) AR219643A1 (en)
AT (1) ATE940T1 (en)
BR (1) BR7907583A (en)
DE (1) DE2850792A1 (en)
GR (1) GR72585B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5954305A (en) * 1982-09-22 1984-03-29 Nippon Shiguneteitsukusu Kk Operational amplifying circuit
JPS5970306A (en) * 1982-10-15 1984-04-20 Sanyo Electric Co Ltd Current generating circuit
JPS59134910A (en) * 1983-01-21 1984-08-02 Toshiba Corp Amplifier circuit
JPS59212780A (en) * 1983-05-18 1984-12-01 Toshiba Corp Level detecting circuit
US4523057A (en) * 1984-04-02 1985-06-11 Gte Business Communication Systems High gain cascode amplifier with negative feedback
DE19639706C1 (en) * 1996-09-26 1997-12-11 Siemens Ag Controlled current source, especially for charge pump
KR101109199B1 (en) 2010-01-06 2012-01-30 주식회사 케이이씨 Microphone amplifier

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581084A (en) * 1967-11-10 1971-05-25 Sumitomo Electric Industries Piezoelectric wheel-axle detector
DE1762924B1 (en) * 1968-09-24 1970-09-03 Siemens Ag Circuit arrangement for a telephone microphone amplifier with an amplifier output side feed
JPS567322B2 (en) * 1972-03-21 1981-02-17
DE2440023C2 (en) 1974-08-21 1981-12-10 Philips Patentverwaltung Gmbh, 2000 Hamburg Current mirror circuit
US3979689A (en) * 1975-01-29 1976-09-07 Rca Corporation Differential amplifier circuit
IT1042763B (en) 1975-09-23 1980-01-30 Ates Componenti Elettron TEMPERATURE COMPENSATED CURRENT MIRROR CIRCUIT
US4030044A (en) * 1975-11-13 1977-06-14 Motorola, Inc. Monolithic amplifier having a balanced, double-to-single ended converter
US4034306A (en) * 1976-04-16 1977-07-05 Linear Technology Inc. D.C. amplifier for use with low supply voltage
JPS6028403B2 (en) * 1976-09-03 1985-07-04 ソニー株式会社 Differential amplifier circuit
JPS5921233B2 (en) * 1976-09-14 1984-05-18 ソニー株式会社 stereo demodulation circuit
JPS5347256A (en) * 1976-10-12 1978-04-27 Sansui Electric Co Amplifying circuit

Also Published As

Publication number Publication date
BR7907583A (en) 1980-08-05
EP0011705A1 (en) 1980-06-11
GR72585B (en) 1983-11-18
US4295100A (en) 1981-10-13
DE2850792C2 (en) 1987-08-27
DE2850792A1 (en) 1980-06-04
EP0011705B1 (en) 1982-04-28
AR219643A1 (en) 1980-08-29

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Legal Events

Date Code Title Description
REN Ceased due to non-payment of the annual fee