JPS5643807A - Detecting circuit - Google Patents

Detecting circuit

Info

Publication number
JPS5643807A
JPS5643807A JP11898279A JP11898279A JPS5643807A JP S5643807 A JPS5643807 A JP S5643807A JP 11898279 A JP11898279 A JP 11898279A JP 11898279 A JP11898279 A JP 11898279A JP S5643807 A JPS5643807 A JP S5643807A
Authority
JP
Japan
Prior art keywords
transistors
outputs
detection
detecting
trnsistors
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
JP11898279A
Other languages
Japanese (ja)
Inventor
Eiichi Matsumura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11898279A priority Critical patent/JPS5643807A/en
Publication of JPS5643807A publication Critical patent/JPS5643807A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
    • H03D1/18—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of semiconductor devices

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To obtain a detecting circuit that facilitates impedance matching, has a high gain and is less in distortion, by obtaining a demodulated signal from a common emitter by supplying two outputs of differential amplifiers to bases of two common emitter type connected transistors. CONSTITUTION:Differential amplifiers (Q1, Q2, R2, and R3) have resistance R1 as a constant current source and an input signal is applied to bases of detecting transistors Q5 and Q6. Transistor Q7 as an impedance converter connects an output AM-detected by trnsistors Q5 and Q6 to low-pass filter (R12, C2). Detecting transistors Q5 and Q6 are turned on by turns with outputs of trnsistors Q1 and Q2 and specially in case of IC-implementation, detection operation that outputs a detection output after smoothing by the parasitic capacity between the emitters of transistors Q5 and Q6 and the earth potential is provided. Consequently, the electric power of higher harmonics generated in the detection is small, which is advantageous to whistle ratio characteristics, etc.
JP11898279A 1979-09-17 1979-09-17 Detecting circuit Pending JPS5643807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11898279A JPS5643807A (en) 1979-09-17 1979-09-17 Detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11898279A JPS5643807A (en) 1979-09-17 1979-09-17 Detecting circuit

Publications (1)

Publication Number Publication Date
JPS5643807A true JPS5643807A (en) 1981-04-22

Family

ID=14750076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11898279A Pending JPS5643807A (en) 1979-09-17 1979-09-17 Detecting circuit

Country Status (1)

Country Link
JP (1) JPS5643807A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61230410A (en) * 1985-04-03 1986-10-14 Sony Corp Am detection circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141956A (en) * 1974-04-04 1975-11-15
JPS5337360A (en) * 1976-09-18 1978-04-06 Matsushita Electric Ind Co Ltd Synchronous demodulator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141956A (en) * 1974-04-04 1975-11-15
JPS5337360A (en) * 1976-09-18 1978-04-06 Matsushita Electric Ind Co Ltd Synchronous demodulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61230410A (en) * 1985-04-03 1986-10-14 Sony Corp Am detection circuit
JPH073929B2 (en) * 1985-04-03 1995-01-18 ソニー株式会社 AM detection circuit

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