JPS56107652A - Wide band receiving circuit - Google Patents

Wide band receiving circuit

Info

Publication number
JPS56107652A
JPS56107652A JP1078280A JP1078280A JPS56107652A JP S56107652 A JPS56107652 A JP S56107652A JP 1078280 A JP1078280 A JP 1078280A JP 1078280 A JP1078280 A JP 1078280A JP S56107652 A JPS56107652 A JP S56107652A
Authority
JP
Japan
Prior art keywords
wide band
attenuators
mixer
case
receiving
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
JP1078280A
Other languages
Japanese (ja)
Inventor
Mitsuo Saito
Sadahiko Yamashita
Morikazu Sagawa
Hiroshi Onishi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1078280A priority Critical patent/JPS56107652A/en
Publication of JPS56107652A publication Critical patent/JPS56107652A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To improve the attenuation characteristic without deteriorating the efficiency of receiving sensitivity, etc., by providing the first and second wide band variable attenuators on the pre-stage of the first mixer, and controlling both the attenuators simultaneously or independently. CONSTITUTION:A television signal which has been input is controlled by control voltage from the automatic control terminal 10 through the driving circuit 14 so that the respective output levels can be constant by the first and second wide band variable attenuators 12, 13 which are able to control the gain. The attenuation characteristic to the frequency in case when both these attenuators have been driven simultaneously by the circuit 14 shows the attenuation amount of 70dB or so extending from VHF band to UHF band, within the range of 10-1V of AGC voltage. Accordingly, since a sufficient attenuation amount can be obtained according to said receiving system, no receiving becomes difficult due to distortion disturbance caused by the wide band amplifier 3 and the first mixer 4, even in case of a high input signal exceeding -25--15dBm.
JP1078280A 1980-01-30 1980-01-30 Wide band receiving circuit Pending JPS56107652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1078280A JPS56107652A (en) 1980-01-30 1980-01-30 Wide band receiving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1078280A JPS56107652A (en) 1980-01-30 1980-01-30 Wide band receiving circuit

Publications (1)

Publication Number Publication Date
JPS56107652A true JPS56107652A (en) 1981-08-26

Family

ID=11759900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1078280A Pending JPS56107652A (en) 1980-01-30 1980-01-30 Wide band receiving circuit

Country Status (1)

Country Link
JP (1) JPS56107652A (en)

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