JPS55123212A - Fm intermediate frequency amplifying circuit - Google Patents

Fm intermediate frequency amplifying circuit

Info

Publication number
JPS55123212A
JPS55123212A JP3002879A JP3002879A JPS55123212A JP S55123212 A JPS55123212 A JP S55123212A JP 3002879 A JP3002879 A JP 3002879A JP 3002879 A JP3002879 A JP 3002879A JP S55123212 A JPS55123212 A JP S55123212A
Authority
JP
Japan
Prior art keywords
power supply
stage
amplifying circuit
amplifying
supply line
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
JP3002879A
Other languages
Japanese (ja)
Inventor
Masanori Ienaka
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP3002879A priority Critical patent/JPS55123212A/en
Publication of JPS55123212A publication Critical patent/JPS55123212A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To reduce interoffice noises of an IF amplifying circuit composed of many stages of differential amplifying circuits by providing an amplifying circuit with a tuning circuit between stages and then by using a different power supply grounded in terms of an alternating current. CONSTITUTION:For example, when an IF amplifying circuit if formed of five cascaded differential amplifiers, ceramic filter 1 is provided between the 3rd-stage and 4th- stage amplifying circuits. Through power supply line Vcc' between the 3rd- stage and 4th-stage amplifying circuits, the power is supplied independently of power supply line Vcc of other amplifying circuits. In this case, power supply line Vcc' is provided with capacitor C2 which removes an AC signal. Thus, signals are prevented from being fed back via the power lines, and inserting ceramic filter 1 provides the great reduction of interoffice noises of output band characteristics OUT.
JP3002879A 1979-03-16 1979-03-16 Fm intermediate frequency amplifying circuit Pending JPS55123212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3002879A JPS55123212A (en) 1979-03-16 1979-03-16 Fm intermediate frequency amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3002879A JPS55123212A (en) 1979-03-16 1979-03-16 Fm intermediate frequency amplifying circuit

Publications (1)

Publication Number Publication Date
JPS55123212A true JPS55123212A (en) 1980-09-22

Family

ID=12292362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3002879A Pending JPS55123212A (en) 1979-03-16 1979-03-16 Fm intermediate frequency amplifying circuit

Country Status (1)

Country Link
JP (1) JPS55123212A (en)

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