JPS647718A - Transmitting power control circuit for radiocommunication equipment - Google Patents

Transmitting power control circuit for radiocommunication equipment

Info

Publication number
JPS647718A
JPS647718A JP16376787A JP16376787A JPS647718A JP S647718 A JPS647718 A JP S647718A JP 16376787 A JP16376787 A JP 16376787A JP 16376787 A JP16376787 A JP 16376787A JP S647718 A JPS647718 A JP S647718A
Authority
JP
Japan
Prior art keywords
power
reflecting
detecting
output
transmitting power
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
JP16376787A
Other languages
Japanese (ja)
Inventor
Shigeki Ikeda
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
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 filed Critical NEC Corp
Priority to JP16376787A priority Critical patent/JPS647718A/en
Publication of JPS647718A publication Critical patent/JPS647718A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To protect a power amplifier, etc., from an excessive reflecting power and to prevent a wasteful power consumption by controlling a transmitting power in response to the detecting output of the reflecting power from a high frequency output terminal. CONSTITUTION:At a detecting circuit part 300, an output power from a power amplifier 2 is detected by an output power detecting circuit 3, the reflecting power of a high frequency output terminal 4 is detected by a reflecting power detecting circuit 9, the value of a VSWR is judged by the value of an output power detecting voltage Vp and a reflecting power detecting voltage VR and the transmitting power control is executed. For example, when the VSWR is degenerated, a control part 8 zero-balances a reference voltage Vs sent from a reference voltage generating circuit 6 by a control voltage VL and turns off the power source of the power amplifier 2.
JP16376787A 1987-06-29 1987-06-29 Transmitting power control circuit for radiocommunication equipment Pending JPS647718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16376787A JPS647718A (en) 1987-06-29 1987-06-29 Transmitting power control circuit for radiocommunication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16376787A JPS647718A (en) 1987-06-29 1987-06-29 Transmitting power control circuit for radiocommunication equipment

Publications (1)

Publication Number Publication Date
JPS647718A true JPS647718A (en) 1989-01-11

Family

ID=15780327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16376787A Pending JPS647718A (en) 1987-06-29 1987-06-29 Transmitting power control circuit for radiocommunication equipment

Country Status (1)

Country Link
JP (1) JPS647718A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04192907A (en) * 1990-11-27 1992-07-13 Saitama Nippon Denki Kk Power amplifier with transmission power control function
JP2003532203A (en) * 2000-04-26 2003-10-28 センサーマチック・エレクトロニックス・コーポレーション RFID reader output control device and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04192907A (en) * 1990-11-27 1992-07-13 Saitama Nippon Denki Kk Power amplifier with transmission power control function
JP2003532203A (en) * 2000-04-26 2003-10-28 センサーマチック・エレクトロニックス・コーポレーション RFID reader output control device and method

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