JPS57196614A - Tuner - Google Patents

Tuner

Info

Publication number
JPS57196614A
JPS57196614A JP8074081A JP8074081A JPS57196614A JP S57196614 A JPS57196614 A JP S57196614A JP 8074081 A JP8074081 A JP 8074081A JP 8074081 A JP8074081 A JP 8074081A JP S57196614 A JPS57196614 A JP S57196614A
Authority
JP
Japan
Prior art keywords
variable
diode
voltage
circuit
base point
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.)
Granted
Application number
JP8074081A
Other languages
Japanese (ja)
Other versions
JPH021405B2 (en
Inventor
Tamaki Ohashi
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.)
Nihon Technical Co Ltd
Original Assignee
Nihon Technical 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 Nihon Technical Co Ltd filed Critical Nihon Technical Co Ltd
Priority to JP8074081A priority Critical patent/JPS57196614A/en
Publication of JPS57196614A publication Critical patent/JPS57196614A/en
Publication of JPH021405B2 publication Critical patent/JPH021405B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes

Abstract

PURPOSE:To easily make the desired band width of a tuning frequency characteristic curve and its base point adjustable, by regulating an upper limit voltage of the base point of a voltage applied to a varactor diode via a variable voltage circuit with a variable resistance circuit. CONSTITUTION:A tuning circuit is formed with a variable inductance element 1 changing the inductance through the use of a high frequency magnetic core and a capacitor using a varactor diode 2. To the diode 2, a variable capacitor 3 forming the resulting capacitance with the diode 2 is connected. Between a variable voltage circuit 4 interlocked with the element 1 and the voltage applied point of the diode 2, a variable resistance circuit 5 is connected, by which the upper and lower limits of the voltage to the voltge applying point are regulated and the operating base point of the diode 2 is adjusted. Then, the variable range of the capacitance and the resulting capacitance of maximum and minimum values can be adjusted variably.
JP8074081A 1981-05-29 1981-05-29 Tuner Granted JPS57196614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8074081A JPS57196614A (en) 1981-05-29 1981-05-29 Tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8074081A JPS57196614A (en) 1981-05-29 1981-05-29 Tuner

Publications (2)

Publication Number Publication Date
JPS57196614A true JPS57196614A (en) 1982-12-02
JPH021405B2 JPH021405B2 (en) 1990-01-11

Family

ID=13726786

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8074081A Granted JPS57196614A (en) 1981-05-29 1981-05-29 Tuner

Country Status (1)

Country Link
JP (1) JPS57196614A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100680738B1 (en) 2005-02-28 2007-02-09 삼성전자주식회사 Variable inductance providing device using variable capacitor and variable frequency generating device using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5663367A (en) * 1979-10-26 1981-05-29 Toray Monofilament Co Catheter type flow guide wire

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5663367A (en) * 1979-10-26 1981-05-29 Toray Monofilament Co Catheter type flow guide wire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100680738B1 (en) 2005-02-28 2007-02-09 삼성전자주식회사 Variable inductance providing device using variable capacitor and variable frequency generating device using the same

Also Published As

Publication number Publication date
JPH021405B2 (en) 1990-01-11

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