JPS5781713A - Wide-band amplifier - Google Patents
Wide-band amplifierInfo
- Publication number
- JPS5781713A JPS5781713A JP55157656A JP15765680A JPS5781713A JP S5781713 A JPS5781713 A JP S5781713A JP 55157656 A JP55157656 A JP 55157656A JP 15765680 A JP15765680 A JP 15765680A JP S5781713 A JPS5781713 A JP S5781713A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- capacitor
- reception
- output
- switching element
- 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
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/24—Automatic control in frequency-selective amplifiers
- H03G5/28—Automatic control in frequency-selective amplifiers having semiconductor devices
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To avoid the deterioration of NF during the reception of VHF low channel, by earthing the output of a high frequency amplifier with a series circuit of a switching element and a capacitor and then varying the gain frequency characteristics by turning on and off the switching element. CONSTITUTION:The output of a high frequency amplifier using a double-super system tuner is earthed with a series circuit of switching element 31 and a capacitor 32. A terminal 34 is set at 0V during the reception of VHF, and accordingly the current which is decided by a resistance 33 and the power supply voltage flows to the element 31 to substantially earth the amplifier with the capacitor 32. This is equivalent to the fact that a low-pass filter is connected to the output of the amplifier to avoid the NF deterioration. On the other hand, the terminal 34 is opened during the reception of UHF, and accordingly the element 31 is turned off. Thus the amplifier has a normal operation to the UHF TV signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55157656A JPS5781713A (en) | 1980-11-11 | 1980-11-11 | Wide-band amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55157656A JPS5781713A (en) | 1980-11-11 | 1980-11-11 | Wide-band amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5781713A true JPS5781713A (en) | 1982-05-21 |
Family
ID=15654490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55157656A Pending JPS5781713A (en) | 1980-11-11 | 1980-11-11 | Wide-band amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5781713A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01149140U (en) * | 1988-04-04 | 1989-10-16 | ||
US7985033B2 (en) | 2004-08-04 | 2011-07-26 | Katsushika Co., Ltd. | Cosmetic application device |
-
1980
- 1980-11-11 JP JP55157656A patent/JPS5781713A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01149140U (en) * | 1988-04-04 | 1989-10-16 | ||
US7985033B2 (en) | 2004-08-04 | 2011-07-26 | Katsushika Co., Ltd. | Cosmetic application device |
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