JPS5733838A - Signal intensity detecting circuit - Google Patents

Signal intensity detecting circuit

Info

Publication number
JPS5733838A
JPS5733838A JP10938380A JP10938380A JPS5733838A JP S5733838 A JPS5733838 A JP S5733838A JP 10938380 A JP10938380 A JP 10938380A JP 10938380 A JP10938380 A JP 10938380A JP S5733838 A JPS5733838 A JP S5733838A
Authority
JP
Japan
Prior art keywords
signal
mixer
frequency amplifier
signal intensity
amplifier
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.)
Granted
Application number
JP10938380A
Other languages
Japanese (ja)
Other versions
JPS6137814B2 (en
Inventor
Eishin Kakihara
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 JP10938380A priority Critical patent/JPS5733838A/en
Publication of JPS5733838A publication Critical patent/JPS5733838A/en
Publication of JPS6137814B2 publication Critical patent/JPS6137814B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver

Landscapes

  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To realize a signal intensity detection having a dynamic range and linearity to the extent of causing no problem in practical use, by using a signal detector of multistage constitution. CONSTITUTION:A signal which has been caught by an antenna 1 is amplified by a high frequency amplifier 2, and is transmitted to a low-frequency stage through a mixer 3, an intermediate frequency amplifier 5 and a detector 6. On the other hand, an output of the mixer 3 is attenuated by an attenuator 7, and its output is inputted to an intermediate amplifier 8 through a ceramic filter CF1. An output of the intermediate amplifier 8 is inputted to a signal intensity detector 9 through a ceramic filter CF2. In the event of a large input signal, an input of the intermediate frequency amplifier 8 is attenuated by the attenuator 7, also the gain of the high-frequency amplifier 2 is reduced, a signal to be inputted to the mixer 3 is attenuated, and it is suppressed that the mixer 3 and the intermediate frequency amplifier 8 is saturated soon.
JP10938380A 1980-08-08 1980-08-08 Signal intensity detecting circuit Granted JPS5733838A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10938380A JPS5733838A (en) 1980-08-08 1980-08-08 Signal intensity detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10938380A JPS5733838A (en) 1980-08-08 1980-08-08 Signal intensity detecting circuit

Publications (2)

Publication Number Publication Date
JPS5733838A true JPS5733838A (en) 1982-02-24
JPS6137814B2 JPS6137814B2 (en) 1986-08-26

Family

ID=14508840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10938380A Granted JPS5733838A (en) 1980-08-08 1980-08-08 Signal intensity detecting circuit

Country Status (1)

Country Link
JP (1) JPS5733838A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60219819A (en) * 1984-04-16 1985-11-02 Hitachi Ltd Receiver
JPH0766744A (en) * 1993-08-30 1995-03-10 Nec Corp Electric field detecting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60219819A (en) * 1984-04-16 1985-11-02 Hitachi Ltd Receiver
JPH0766744A (en) * 1993-08-30 1995-03-10 Nec Corp Electric field detecting circuit

Also Published As

Publication number Publication date
JPS6137814B2 (en) 1986-08-26

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