JPS5676638A - Automatic output controlling system for am transmitter - Google Patents

Automatic output controlling system for am transmitter

Info

Publication number
JPS5676638A
JPS5676638A JP15363079A JP15363079A JPS5676638A JP S5676638 A JPS5676638 A JP S5676638A JP 15363079 A JP15363079 A JP 15363079A JP 15363079 A JP15363079 A JP 15363079A JP S5676638 A JPS5676638 A JP S5676638A
Authority
JP
Japan
Prior art keywords
voltage
amplifier
power amplifier
current
pulse width
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
Application number
JP15363079A
Other languages
Japanese (ja)
Other versions
JPS584495B2 (en
Inventor
Tetsuo Yoshida
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP15363079A priority Critical patent/JPS584495B2/en
Publication of JPS5676638A publication Critical patent/JPS5676638A/en
Publication of JPS584495B2 publication Critical patent/JPS584495B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Transmitters (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE: To prevent the increase in the high frequency output current due to load variation, by feedback both the amplitude of voltage and current of a high-frequency power amplifier and giving priority of the effect of feedback by the amplitude of current.
CONSTITUTION: The input signal from an audio signal terminal 15 is modulated into PWM signal at a pulse width modulator 16, and it passes through a low-pass filter 19 via a drive circuit 17 and switching power amplifier 18, and the voltage of a high-frequency power amplifier 12 is changed with reproduced audio signal, the voltage of this amplifier is changed, and the voltage of the amplifier 12 is negative- fed back to the input side of a pulse width modulator 16 through a differential amplifier 24. Further, after the high-frequency output current of the high-frequency power amplifier 12 is converted into a voltage via a high frequency current transformer 42, it is averaged via an envelope detection circuit and smoothing circuit, and this average output is fed back to the input side of the pulse width modulator 16 through a half wave rectifying circuit consisting of an operational amplifier 48, diodes 49, 50 and resistance 51.
COPYRIGHT: (C)1981,JPO&Japio
JP15363079A 1979-11-29 1979-11-29 AM transmitter automatic output control method Expired JPS584495B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15363079A JPS584495B2 (en) 1979-11-29 1979-11-29 AM transmitter automatic output control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15363079A JPS584495B2 (en) 1979-11-29 1979-11-29 AM transmitter automatic output control method

Publications (2)

Publication Number Publication Date
JPS5676638A true JPS5676638A (en) 1981-06-24
JPS584495B2 JPS584495B2 (en) 1983-01-26

Family

ID=15566693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15363079A Expired JPS584495B2 (en) 1979-11-29 1979-11-29 AM transmitter automatic output control method

Country Status (1)

Country Link
JP (1) JPS584495B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0476732U (en) * 1990-11-19 1992-07-03
JP2007535274A (en) * 2004-04-28 2007-11-29 ソニー エリクソン モバイル コミュニケーションズ， エービー Radio terminal, method and computer program product with transmit power amplifier input power adjustment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0476732U (en) * 1990-11-19 1992-07-03
JP2007535274A (en) * 2004-04-28 2007-11-29 ソニー エリクソン モバイル コミュニケーションズ， エービー Radio terminal, method and computer program product with transmit power amplifier input power adjustment

Also Published As

Publication number Publication date
JPS584495B2 (en) 1983-01-26

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