BR7907583A - Amplificador de microfone sobretudo para instalacoes telefonicas - Google Patents
Amplificador de microfone sobretudo para instalacoes telefonicasInfo
- Publication number
- BR7907583A BR7907583A BR7907583A BR7907583A BR7907583A BR 7907583 A BR7907583 A BR 7907583A BR 7907583 A BR7907583 A BR 7907583A BR 7907583 A BR7907583 A BR 7907583A BR 7907583 A BR7907583 A BR 7907583A
- Authority
- BR
- Brazil
- Prior art keywords
- microphone amplifier
- telephone installations
- overall microphone
- overall
- installations
- Prior art date
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)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19782850792 DE2850792A1 (de) | 1978-11-23 | 1978-11-23 | Mikrofonverstaerker, insbesondere fuer fernsprechanlagen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR7907583A true BR7907583A (pt) | 1980-08-05 |
Family
ID=6055415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR7907583A BR7907583A (pt) | 1978-11-23 | 1979-11-22 | Amplificador de microfone sobretudo para instalacoes telefonicas |
Country Status (7)
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5954305A (ja) * | 1982-09-22 | 1984-03-29 | Nippon Shiguneteitsukusu Kk | 演算増幅回路 |
| JPS5970306A (ja) * | 1982-10-15 | 1984-04-20 | Sanyo Electric Co Ltd | 電流発生回路 |
| JPS59134910A (ja) * | 1983-01-21 | 1984-08-02 | Toshiba Corp | 増幅回路 |
| JPS59212780A (ja) * | 1983-05-18 | 1984-12-01 | Toshiba Corp | レベル検出回路 |
| US4523057A (en) * | 1984-04-02 | 1985-06-11 | Gte Business Communication Systems | High gain cascode amplifier with negative feedback |
| DE19639706C1 (de) * | 1996-09-26 | 1997-12-11 | Siemens Ag | Geschaltete Stromquelle |
| KR101109199B1 (ko) | 2010-01-06 | 2012-01-30 | 주식회사 케이이씨 | 마이크로폰 증폭기 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3581084A (en) * | 1967-11-10 | 1971-05-25 | Sumitomo Electric Industries | Piezoelectric wheel-axle detector |
| DE1762924B1 (de) * | 1968-09-24 | 1970-09-03 | Siemens Ag | Schaltungsanordnung fuer einen Fernsprechmikrofonverstaerker mit verstaerkerausgangsseitiger Speisung |
| JPS567322B2 (US20100223739A1-20100909-C00005.png) * | 1972-03-21 | 1981-02-17 | ||
| US3979689A (en) * | 1975-01-29 | 1976-09-07 | Rca Corporation | Differential amplifier 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 (ja) * | 1976-09-03 | 1985-07-04 | ソニー株式会社 | 差動増巾回路 |
| JPS5921233B2 (ja) * | 1976-09-14 | 1984-05-18 | ソニー株式会社 | ステレオ復調回路 |
| JPS5347256A (en) * | 1976-10-12 | 1978-04-27 | Sansui Electric Co | Amplifying circuit |
-
1978
- 1978-11-23 DE DE19782850792 patent/DE2850792A1/de active Granted
-
1979
- 1979-10-18 AT AT79104040T patent/ATE940T1/de not_active IP Right Cessation
- 1979-10-18 EP EP79104040A patent/EP0011705B1/de not_active Expired
- 1979-11-01 US US06/090,468 patent/US4295100A/en not_active Expired - Lifetime
- 1979-11-21 GR GR60560A patent/GR72585B/el unknown
- 1979-11-22 BR BR7907583A patent/BR7907583A/pt unknown
- 1979-11-22 AR AR278995A patent/AR219643A1/es active
Also Published As
| Publication number | Publication date |
|---|---|
| EP0011705A1 (de) | 1980-06-11 |
| GR72585B (US20100223739A1-20100909-C00005.png) | 1983-11-18 |
| US4295100A (en) | 1981-10-13 |
| DE2850792A1 (de) | 1980-06-04 |
| EP0011705B1 (de) | 1982-04-28 |
| AR219643A1 (es) | 1980-08-29 |
| ATE940T1 (de) | 1982-05-15 |
| DE2850792C2 (US20100223739A1-20100909-C00005.png) | 1987-08-27 |
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