JPS5614732A - Change-over circuit - Google Patents

Change-over circuit

Info

Publication number
JPS5614732A
JPS5614732A JP9122979A JP9122979A JPS5614732A JP S5614732 A JPS5614732 A JP S5614732A JP 9122979 A JP9122979 A JP 9122979A JP 9122979 A JP9122979 A JP 9122979A JP S5614732 A JPS5614732 A JP S5614732A
Authority
JP
Japan
Prior art keywords
terminal
diode
coil
bias
transistor
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
JP9122979A
Other languages
Japanese (ja)
Inventor
Shinichi Sato
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9122979A priority Critical patent/JPS5614732A/en
Publication of JPS5614732A publication Critical patent/JPS5614732A/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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/48—Transmit/receive switching in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter

Abstract

PURPOSE:To make use of electric power of switching effectively and also to make it possible to realize operation with a single electric power source by incorporating a transistor switch circuit in the switching control circuit of a high-frequency change- over circuit. CONSTITUTION:In transmission, a positive bias is supplied to transmitting bias terminal VT and receiving bias terminal VR is held at zero voltage. Electric current from terminal VT flows through resistance R1, choke coil L1, diode D1, coil L2, transistor TR1 and light emission diode D2 in sequence. Further, diode D2 turns off since transistor TR2 turns off. In reception, terminal VT is held at zero voltage and terminal VR is applied with the positive bias. By way of TR2, coil L3, diode D2 and coil L2, bias current from terminal VR is accumulated in capacitor C4 and then supplied to reception part RX.
JP9122979A 1979-07-17 1979-07-17 Change-over circuit Pending JPS5614732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9122979A JPS5614732A (en) 1979-07-17 1979-07-17 Change-over circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9122979A JPS5614732A (en) 1979-07-17 1979-07-17 Change-over circuit

Publications (1)

Publication Number Publication Date
JPS5614732A true JPS5614732A (en) 1981-02-13

Family

ID=14020587

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9122979A Pending JPS5614732A (en) 1979-07-17 1979-07-17 Change-over circuit

Country Status (1)

Country Link
JP (1) JPS5614732A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598051A1 (en) * 1986-04-24 1987-10-30 Commissariat Energie Atomique Wide-band and fast-switching device for a high-frequency transmission/reception antenna
JPH02237319A (en) * 1989-03-10 1990-09-19 Matsushita Electric Ind Co Ltd Antenna changeover switch
JPH0525850U (en) * 1991-09-13 1993-04-02 株式会社ケンウツド Antenna switching circuit
EP1376884A1 (en) * 2002-06-26 2004-01-02 STMicroelectronics N.V. Radiofrequency switching means, in particular for a cellular mobile phone

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598051A1 (en) * 1986-04-24 1987-10-30 Commissariat Energie Atomique Wide-band and fast-switching device for a high-frequency transmission/reception antenna
JPH02237319A (en) * 1989-03-10 1990-09-19 Matsushita Electric Ind Co Ltd Antenna changeover switch
JPH0525850U (en) * 1991-09-13 1993-04-02 株式会社ケンウツド Antenna switching circuit
EP1376884A1 (en) * 2002-06-26 2004-01-02 STMicroelectronics N.V. Radiofrequency switching means, in particular for a cellular mobile phone

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