JPS5781713A - Wide-band amplifier - Google Patents

Wide-band amplifier

Info

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
Application number
JP55157656A
Other languages
Japanese (ja)
Inventor
Shigeo Ogawa
Toshiki Miyasaka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55157656A priority Critical patent/JPS5781713A/en
Publication of JPS5781713A publication Critical patent/JPS5781713A/en
Pending legal-status Critical Current

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

  • Superheterodyne Receivers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (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.
JP55157656A 1980-11-11 1980-11-11 Wide-band amplifier Pending JPS5781713A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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