JPS57210714A - Tuning circuit - Google Patents

Tuning circuit

Info

Publication number
JPS57210714A
JPS57210714A JP9533781A JP9533781A JPS57210714A JP S57210714 A JPS57210714 A JP S57210714A JP 9533781 A JP9533781 A JP 9533781A JP 9533781 A JP9533781 A JP 9533781A JP S57210714 A JPS57210714 A JP S57210714A
Authority
JP
Japan
Prior art keywords
circuit
variable
diodes
adjusting
tuning
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
JP9533781A
Other languages
Japanese (ja)
Other versions
JPH0217965B2 (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 JP9533781A priority Critical patent/JPS57210714A/en
Publication of JPS57210714A publication Critical patent/JPS57210714A/en
Publication of JPH0217965B2 publication Critical patent/JPH0217965B2/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 make the adjusting operation easy and to use diods with different characteristics, by providing a variable adjusting circuit variably adjusting the operating range of a varactor diode between the varactor diode of a tuning circuit and a variable voltage circuit. CONSTITUTION:A series circuit consisting of a plurality of varactor diodes 2a and 2b and variable capacitors 3a and 3b is connected in parallel with a tuning coil 1 of a tuning circuit and a voltage is applied to the diodes 2a and 2b from a variable voltage circuit 5. Variable adjusting circuits 6 and 7 variably adjusting the operating range of the diodes 2a and 2b are connected between the circuit 5 and the diode 2a or the diodes 2a and 2b. The circuits 6 and 7 are constituted with variable resistors R6a and R6b, and R7a and R7b and a bridge circuit is constituted with a variable resistor R5 of the circuit 5. The tuning operation can be made easy and diodes with different characteristics can be used.
JP9533781A 1981-06-22 1981-06-22 Tuning circuit Granted JPS57210714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9533781A JPS57210714A (en) 1981-06-22 1981-06-22 Tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9533781A JPS57210714A (en) 1981-06-22 1981-06-22 Tuning circuit

Publications (2)

Publication Number Publication Date
JPS57210714A true JPS57210714A (en) 1982-12-24
JPH0217965B2 JPH0217965B2 (en) 1990-04-24

Family

ID=14134887

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9533781A Granted JPS57210714A (en) 1981-06-22 1981-06-22 Tuning circuit

Country Status (1)

Country Link
JP (1) JPS57210714A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5813013A (en) * 1981-07-17 1983-01-25 Nippon Technical Co Ltd Tuning circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717314U (en) * 1980-06-30 1982-01-29

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879621A (en) * 1973-04-18 1975-04-22 Ibm Sense amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5717314U (en) * 1980-06-30 1982-01-29

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5813013A (en) * 1981-07-17 1983-01-25 Nippon Technical Co Ltd Tuning circuit

Also Published As

Publication number Publication date
JPH0217965B2 (en) 1990-04-24

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