JPS5710536A - Mixing circuit - Google Patents

Mixing circuit

Info

Publication number
JPS5710536A
JPS5710536A JP8368080A JP8368080A JPS5710536A JP S5710536 A JPS5710536 A JP S5710536A JP 8368080 A JP8368080 A JP 8368080A JP 8368080 A JP8368080 A JP 8368080A JP S5710536 A JPS5710536 A JP S5710536A
Authority
JP
Japan
Prior art keywords
circuit
tuning
semiconductor element
mixing circuit
capacitance
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
JP8368080A
Other languages
Japanese (ja)
Inventor
Masayuki Suzuki
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.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen 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 Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP8368080A priority Critical patent/JPS5710536A/en
Publication of JPS5710536A publication Critical patent/JPS5710536A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes

Landscapes

  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To correct the tuning shift of a tuning circuit produced at common using of the mixing circuit for television receivers and the like automatically, by correcting the output capacity of a semiconductor element changed with the variation of the operating point through the use of a varactor element. CONSTITUTION:A varactor diode 8 where the change in the output capacitance of a semiconductor element 3 accompanied with the variation of the operating point can be canceled, is provided to a semiconductor device which operates as a mixing circuit in the reception of VHF band and as intermediate frequency amplifier circuit in the reception of UHF band. For example, in the case of the operation at the UHF band, the supply current value from a bias voltage source 2 to the semiconductor element 3 is increased and the output capacity is increased, while the capacitance of the element 8 is reduced the increase in the back bias voltage. By adjusting the value of capacitors 7, 9 and resistor 6 of the circuit, the change in the output capacitance is canceled, allowing to correct the tuning shift of tuning circuits 7-10 automatically.
JP8368080A 1980-06-20 1980-06-20 Mixing circuit Pending JPS5710536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8368080A JPS5710536A (en) 1980-06-20 1980-06-20 Mixing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8368080A JPS5710536A (en) 1980-06-20 1980-06-20 Mixing circuit

Publications (1)

Publication Number Publication Date
JPS5710536A true JPS5710536A (en) 1982-01-20

Family

ID=13809192

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8368080A Pending JPS5710536A (en) 1980-06-20 1980-06-20 Mixing circuit

Country Status (1)

Country Link
JP (1) JPS5710536A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62149227A (en) * 1985-12-24 1987-07-03 Citizen Watch Co Ltd Tuner
US6774719B1 (en) * 2002-06-25 2004-08-10 Nortel Networks Limited Power amplifier configuration

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62149227A (en) * 1985-12-24 1987-07-03 Citizen Watch Co Ltd Tuner
US6774719B1 (en) * 2002-06-25 2004-08-10 Nortel Networks Limited Power amplifier configuration

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