JPS5714212A - Tuner - Google Patents
TunerInfo
- Publication number
- JPS5714212A JPS5714212A JP8936680A JP8936680A JPS5714212A JP S5714212 A JPS5714212 A JP S5714212A JP 8936680 A JP8936680 A JP 8936680A JP 8936680 A JP8936680 A JP 8936680A JP S5714212 A JPS5714212 A JP S5714212A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- antenna
- coil
- capacity
- terminal
- 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
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
PURPOSE: To improve the NF of a high frequency amplifying circuit and to improve S/N sensitivity by achieving matching with the capacity of an antenna circuit and by giving selectivity at the point in time.
CONSTITUTION: A coil L1 is provided between the earth and an antenna output terminal which has input impedance consisting of antenna capacity Ca and antenna feeder capacity Cc, and in parallel to the coil L1, a series circuit of a coil L2 and a varactor Cv which is connected to the antenna output terminal at one terminal and to the earth at the other terminal is provided for matching with an antenna circuit. In this constitution, electric power supplied to the gate of a high-frequency amplifying circuit FET is in proportion to the Q of a resonance circuit and larger power than that in a detuning state is transferred; and the NF of the FET relates to the resistance value of a signal source, and inserting this circuit (a) increases the resistance from about 2kΩ to about 100kΩ.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8936680A JPS5714212A (en) | 1980-06-30 | 1980-06-30 | Tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8936680A JPS5714212A (en) | 1980-06-30 | 1980-06-30 | Tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5714212A true JPS5714212A (en) | 1982-01-25 |
Family
ID=13968696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8936680A Pending JPS5714212A (en) | 1980-06-30 | 1980-06-30 | Tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5714212A (en) |
-
1980
- 1980-06-30 JP JP8936680A patent/JPS5714212A/en active Pending
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