JPS5710536A - Mixing circuit - Google Patents
Mixing circuitInfo
- 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
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.
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)
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 |
-
1980
- 1980-06-20 JP JP8368080A patent/JPS5710536A/en active Pending
Cited By (2)
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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