[go: up one dir, main page]

JPS57206132A - Radiotelephony device - Google Patents

Radiotelephony device

Info

Publication number
JPS57206132A
JPS57206132A JP56090290A JP9029081A JPS57206132A JP S57206132 A JPS57206132 A JP S57206132A JP 56090290 A JP56090290 A JP 56090290A JP 9029081 A JP9029081 A JP 9029081A JP S57206132 A JPS57206132 A JP S57206132A
Authority
JP
Japan
Prior art keywords
circuit
output
electric power
power amplifying
idle channel
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
JP56090290A
Other languages
Japanese (ja)
Inventor
Yasuyuki Nomoto
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56090290A priority Critical patent/JPS57206132A/en
Publication of JPS57206132A publication Critical patent/JPS57206132A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • H04B2001/0408—Circuits with power amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE:To prevent the abnormal oscillation of an electric power amplifying circuit and to transmit and receive only the stable real channel signal, by exercising control so as to avoid the output of signals from the electric power amplifying circuit when an idle channel is selected. CONSTITUTION:A current detecting circuit 7 detects the current flowing to the final stage of an electric power amplifying circuit 4 and feeds the detected current to an output control circuit 8 in the form of a feedback signal. The circuit 8 controls the intermediate signal level of the circuit 4 based on the detected current which is applied to the circuit 7. In other words, the amplified output of the circuit 4 is stably controlled by a control loop comprising the circuits 4, 7 and 8. An idle channel is selected by a channel designating circuit 1. In this case, the circuit 8 stops and controls the output of the circuit 4 based on the idle channel signal OC. In other words, the intermediate signal level is controlled to be set zero.
JP56090290A 1981-06-12 1981-06-12 Radiotelephony device Pending JPS57206132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56090290A JPS57206132A (en) 1981-06-12 1981-06-12 Radiotelephony device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56090290A JPS57206132A (en) 1981-06-12 1981-06-12 Radiotelephony device

Publications (1)

Publication Number Publication Date
JPS57206132A true JPS57206132A (en) 1982-12-17

Family

ID=13994393

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56090290A Pending JPS57206132A (en) 1981-06-12 1981-06-12 Radiotelephony device

Country Status (1)

Country Link
JP (1) JPS57206132A (en)

Similar Documents

Publication Publication Date Title
ES8202210A1 (en) Voltage and temperature stabilized constant current source circuit
JPS57206132A (en) Radiotelephony device
CA2102735A1 (en) Apparatus for Adjusting the Efficiency of Electric Power Amplification
JPS5474601A (en) Hysteresis circuit of current control
JPS5744312A (en) Automatic level control circuit
JPS647719A (en) Transmitting power control circuit
JPS56132172A (en) Rectification circuit
JPS5717207A (en) Amplifying circuit
JPS5616311A (en) Transistor circuit
JPS56156005A (en) Electric power amplifier
JPS5455109A (en) Controller for signal level
JPS5793707A (en) Reference voltage generating circuit
JPS5490549A (en) Dc stabilized power source device
JPS5739429A (en) Regulated power supply
JPS56122513A (en) Electric power supply system
JPS57100362A (en) Ultrasonic wave measuring device
JPS57206185A (en) Convergence device
JPS6446324A (en) Control circuit for switching transmission power of portable radio equipment
JPS5232697A (en) Laser oscillation equipment
JPS5550679A (en) Laser drive current control system
JPS54122927A (en) Integrated circuit
JPS5539918A (en) Voltage and current output circuit
JPS57208713A (en) Bias controlling circuit
JPS5723341A (en) Optical transmission system
JPS647722A (en) Transmitting power control system