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

Landscapes

  • Transmitters (AREA)

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

Similar Documents

Publication Publication Date Title
WO2000003563A3 (en) Rf power supply
CA2124880A1 (en) Current Sense Circuit Apparatus for Power Amplifier Control
CA2017904A1 (en) High frequency amplifier circuit capable of optimizing a total power consumption
CA2202710A1 (en) Current regulating switch circuit
EP0059053A3 (en) Switched mode power supply
EP0367101A3 (en) Television apparatus with switching power supply
CA2080050A1 (en) Power supply controller and frequency synthesizer using the same
JPS568956A (en) Three-terminal electric power source circuit for telephone set
JPS647718A (en) Transmitting power control circuit for radiocommunication equipment
EP0381241A3 (en) High speed output circuit suitable for wired-or structure
JPS54109523A (en) Air fuel ratio controller
JPS5612111A (en) Electric power supply unit of electric power amplifier
EP0229728A3 (en) Pulse forming networks
JPS57204928A (en) Stabilized power supply circuit
CA2144414A1 (en) Gas discharge device current control circuit
JPS57152020A (en) Power supply circuit for device with small sized printer
JPS5576578A (en) Overdischarge-preventing circuit for battery
ES2065282A2 (en) Switch mode power supply with shortcircuit current limitation.
JPS53147255A (en) Current output circuit
JPS5526032A (en) Power supply device
JPS56122513A (en) Electric power supply system
JPS56126303A (en) Dynamic analog amplifier
JPS6446324A (en) Control circuit for switching transmission power of portable radio equipment
JPS6471317A (en) Threshold comparing circuit
JPS647719A (en) Transmitting power control circuit