JPS5683106A - Isolation circuit - Google Patents

Isolation circuit

Info

Publication number
JPS5683106A
JPS5683106A JP16022979A JP16022979A JPS5683106A JP S5683106 A JPS5683106 A JP S5683106A JP 16022979 A JP16022979 A JP 16022979A JP 16022979 A JP16022979 A JP 16022979A JP S5683106 A JPS5683106 A JP S5683106A
Authority
JP
Japan
Prior art keywords
differential amplifier
circuit
trs
rejection ratio
completely symmetrical
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
JP16022979A
Other languages
Japanese (ja)
Inventor
Akio Tokuge
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP16022979A priority Critical patent/JPS5683106A/en
Publication of JPS5683106A publication Critical patent/JPS5683106A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To increase the in-phase rejection ratio, by connecting a circuit completely symmetrical left and right to a differential amplifier, applying the same wave signal to the differential amplifier, and avoiding the production of noise at audible band passing through LPF. CONSTITUTION:The base of transistors (TR) Q1, Q2 of the differential amplifier for isolation is connected to a completely symmetrical circuit, where the bias and the signal are fed. This circuit consists of constant current sources TRs Q6-Q9, emitter follower Trs Q10-Q13 and resistors R2, R3. Further, since the circuit against TRs Q1, Q2 is completely symmetrical left and right, the same wave signal is fed to each base of the differential amplifier, allowing to avoid the deterioration of the in- phase rejection ratio. Further, since the differential amplifier does not produce even order distortion, the output waveform is up and down symmetrical. No noise is produced to an audible band through passing via LPF. Thus, the in-phase rejection ratio is increased.
JP16022979A 1979-12-12 1979-12-12 Isolation circuit Pending JPS5683106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16022979A JPS5683106A (en) 1979-12-12 1979-12-12 Isolation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16022979A JPS5683106A (en) 1979-12-12 1979-12-12 Isolation circuit

Publications (1)

Publication Number Publication Date
JPS5683106A true JPS5683106A (en) 1981-07-07

Family

ID=15710489

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16022979A Pending JPS5683106A (en) 1979-12-12 1979-12-12 Isolation circuit

Country Status (1)

Country Link
JP (1) JPS5683106A (en)

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