FR2390858A1 - Emetteur a modulation d'amplitude - Google Patents
Emetteur a modulation d'amplitudeInfo
- Publication number
- FR2390858A1 FR2390858A1 FR7813929A FR7813929A FR2390858A1 FR 2390858 A1 FR2390858 A1 FR 2390858A1 FR 7813929 A FR7813929 A FR 7813929A FR 7813929 A FR7813929 A FR 7813929A FR 2390858 A1 FR2390858 A1 FR 2390858A1
- Authority
- FR
- France
- Prior art keywords
- modulating voltage
- amplitude modulation
- controlled
- modulation transmitter
- carrier
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/324—An amplitude modulator or demodulator being used in the amplifier circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
- Amplitude Modulation (AREA)
Abstract
Emetteur à modulation d'amplitude à porteuse commandée, dans lequel l'amplitude de la porteuse est réduite aux faibles amplitudes de la tension modulante (programme), afin d'améliorer le rendement. L'amplificateur de modulation 5' utilisé est constitué par un amplificateur de commutation 10 d'impulsions modulées en durée, avec en amont un modulateur 9 commandé par la tension modulante. La grandeur de commande U equiv est appliquée, directement ou non, au modulateur d'impulsions en durée 9, en plus de la tension modulante Uz. L'invention est applicable en particulier aux émetteurs de grande puissance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2720930A DE2720930C3 (de) | 1977-05-10 | 1977-05-10 | Amplitudenmodulierter Sender |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2390858A1 true FR2390858A1 (fr) | 1978-12-08 |
FR2390858B1 FR2390858B1 (fr) | 1984-11-30 |
Family
ID=6008496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7813929A Granted FR2390858A1 (fr) | 1977-05-10 | 1978-05-10 | Emetteur a modulation d'amplitude |
Country Status (4)
Country | Link |
---|---|
US (1) | US4186346A (fr) |
CH (1) | CH634183A5 (fr) |
DE (1) | DE2720930C3 (fr) |
FR (1) | FR2390858A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0234936A2 (fr) * | 1986-02-25 | 1987-09-02 | Continental Electronics Corporation | Emetteur radio MA |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3172506D1 (en) * | 1980-06-18 | 1985-11-07 | Marconi Co Ltd | Circuit for supplying an amplitude modulated current to an r.f. stage of a radio transmitter |
CH664655A5 (de) * | 1980-12-12 | 1988-03-15 | Patelhold Patentverwertung | Verfahren und verstaerkerschaltung zum verstaerken elektrischer signale, insbesondere nf-modulationssignale eines rundfunksenders. |
US4386371A (en) * | 1981-07-28 | 1983-05-31 | Rca Corporation | Wired remote control apparatus for a television receiver |
CH666374A5 (de) * | 1983-08-12 | 1988-07-15 | Bbc Brown Boveri & Cie | Amplitudenmodulierter sender mit steuerung des traegerwertes. |
CH666582A5 (de) * | 1984-04-03 | 1988-07-29 | Bbc Brown Boveri & Cie | Amplitudenmodulierter sender mit anoden-b-modulation. |
CH666148A5 (de) * | 1984-05-10 | 1988-06-30 | Bbc Brown Boveri & Cie | Verfahren zur traegersteuerung eines amplitudenmodulierten senders und schaltungsanordnung zur durchfuehrung des verfahrens. |
JPS61161005A (ja) * | 1985-01-09 | 1986-07-21 | Nec Corp | 振幅変調送信機 |
US4776036A (en) * | 1986-02-25 | 1988-10-04 | Varian Associates, Inc. | RF-AM transmitter with pulse width modulator |
JPH0785524B2 (ja) | 1988-12-28 | 1995-09-13 | パイオニア株式会社 | パルス幅変調増幅回路 |
US5249201A (en) * | 1991-02-01 | 1993-09-28 | Mst, Inc. | Transmission of multiple carrier signals in a nonlinear system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1270130B (de) * | 1963-10-10 | 1968-06-12 | Telefunken Patent | Verfahren zur Erzeugung einer amplitudenmodulierten Hochfrequenzschwingung grosser Leistung mit grossem Wirkungsgrad und Schaltung zu seiner Durchfuehrung |
DE1766586A1 (de) * | 1968-06-18 | 1971-07-29 | Collins Radio Co | HF-Leistungsverstaerkung mit hohem Wirkungsgrad mit Modulationssignal >>Zeitpunkt<<-geschaltetem Verstaerker-Gleichspannungspotential |
FR2286547A1 (fr) * | 1974-09-30 | 1976-04-23 | Westinghouse Electric Corp | Dispositif regulateur de puissance et de modulation |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413570A (en) * | 1966-02-23 | 1968-11-26 | Collins Radio Co | High efficiency rf power amplification with modulation signal controlled "on"-"off" switch varied amplifier dc potentials |
US3477042A (en) * | 1967-06-21 | 1969-11-04 | Communications Satellite Corp | Constant level loading of f.m. modulator |
US4122415A (en) * | 1977-03-21 | 1978-10-24 | Rca Corporation | AM transmitter with an offset voltage to the RF stage to compensate for switching time of the modulators |
-
1977
- 1977-05-10 DE DE2720930A patent/DE2720930C3/de not_active Expired
-
1978
- 1978-05-01 CH CH472078A patent/CH634183A5/de not_active IP Right Cessation
- 1978-05-03 US US05/902,483 patent/US4186346A/en not_active Expired - Lifetime
- 1978-05-10 FR FR7813929A patent/FR2390858A1/fr active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1270130B (de) * | 1963-10-10 | 1968-06-12 | Telefunken Patent | Verfahren zur Erzeugung einer amplitudenmodulierten Hochfrequenzschwingung grosser Leistung mit grossem Wirkungsgrad und Schaltung zu seiner Durchfuehrung |
DE1766586A1 (de) * | 1968-06-18 | 1971-07-29 | Collins Radio Co | HF-Leistungsverstaerkung mit hohem Wirkungsgrad mit Modulationssignal >>Zeitpunkt<<-geschaltetem Verstaerker-Gleichspannungspotential |
FR2286547A1 (fr) * | 1974-09-30 | 1976-04-23 | Westinghouse Electric Corp | Dispositif regulateur de puissance et de modulation |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0234936A2 (fr) * | 1986-02-25 | 1987-09-02 | Continental Electronics Corporation | Emetteur radio MA |
EP0234936A3 (en) * | 1986-02-25 | 1989-07-12 | Varian Associates, Inc. | Pulse with modulator for am-rf transmitter |
US4896372A (en) * | 1986-02-25 | 1990-01-23 | Varian Associates, Inc. | Pulse width modulator for AM-RF transmitter |
Also Published As
Publication number | Publication date |
---|---|
FR2390858B1 (fr) | 1984-11-30 |
DE2720930C3 (de) | 1980-12-11 |
US4186346A (en) | 1980-01-29 |
CH634183A5 (de) | 1983-01-14 |
DE2720930B2 (de) | 1980-04-10 |
DE2720930A1 (de) | 1978-11-16 |
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