JPS57207408A - High frequency power amplifier - Google Patents

High frequency power amplifier

Info

Publication number
JPS57207408A
JPS57207408A JP9251281A JP9251281A JPS57207408A JP S57207408 A JPS57207408 A JP S57207408A JP 9251281 A JP9251281 A JP 9251281A JP 9251281 A JP9251281 A JP 9251281A JP S57207408 A JPS57207408 A JP S57207408A
Authority
JP
Japan
Prior art keywords
power
output
output power
amplifier
voltage
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.)
Pending
Application number
JP9251281A
Other languages
Japanese (ja)
Inventor
Terutoshi Furukawa
Naohisa Wake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP9251281A priority Critical patent/JPS57207408A/en
Publication of JPS57207408A publication Critical patent/JPS57207408A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers

Abstract

PURPOSE:To attain effective use of electromagnetic waves, by controlling a reference voltage and a detecting voltage at a control circuit, controlling a variable gain power amplifier so that an output power corresponding to the reference voltage can be obtained and obtaining a minimum output power required for the frequency of the power amplifier. CONSTITUTION:A high frequency power applied to an input terminal 8 is amplified at a variable gain amplifier 1, further amplified at a power amplifier 2 and applied to a load from an output terminal 9. A part of the output power is picked up at a directional coupler 3 and rectified into a DC at a detector 4. An output voltage 14 of the detector 4 is compared at a control circuit 5 with a reference voltage 15 selected out of a plurality of reference voltages at a switching selection circuit 6 with a control circuit 5, a control voltage 16 is outputted so that an output corresponding to the reference voltage can be obtained at the terminal 9 by changing the gain of the amplifier 1. The output power is controlled with the reference power and an arbitrary stable output power can be obtained. Thus, required minimum output power can be obtained not to prevent the effective use of electromagnetic waves.
JP9251281A 1981-06-16 1981-06-16 High frequency power amplifier Pending JPS57207408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9251281A JPS57207408A (en) 1981-06-16 1981-06-16 High frequency power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9251281A JPS57207408A (en) 1981-06-16 1981-06-16 High frequency power amplifier

Publications (1)

Publication Number Publication Date
JPS57207408A true JPS57207408A (en) 1982-12-20

Family

ID=14056362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9251281A Pending JPS57207408A (en) 1981-06-16 1981-06-16 High frequency power amplifier

Country Status (1)

Country Link
JP (1) JPS57207408A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173408A (en) * 1984-09-19 1986-04-15 Matsushita Electric Ind Co Ltd Controlling method of transmitting output
US4819091A (en) * 1987-04-30 1989-04-04 International Business Machines Corporation High speed magnetic disk contact recording system
JPH01276404A (en) * 1988-04-27 1989-11-07 Hitachi Ltd Magnetic recording and reproducing device
JPH04192636A (en) * 1990-11-22 1992-07-10 Nec Corp Transmission burst power control circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6173408A (en) * 1984-09-19 1986-04-15 Matsushita Electric Ind Co Ltd Controlling method of transmitting output
US4819091A (en) * 1987-04-30 1989-04-04 International Business Machines Corporation High speed magnetic disk contact recording system
JPH01276404A (en) * 1988-04-27 1989-11-07 Hitachi Ltd Magnetic recording and reproducing device
JPH04192636A (en) * 1990-11-22 1992-07-10 Nec Corp Transmission burst power control circuit

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