JPS57155813A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPS57155813A
JPS57155813A JP4149281A JP4149281A JPS57155813A JP S57155813 A JPS57155813 A JP S57155813A JP 4149281 A JP4149281 A JP 4149281A JP 4149281 A JP4149281 A JP 4149281A JP S57155813 A JPS57155813 A JP S57155813A
Authority
JP
Japan
Prior art keywords
potential
terminal
increased
output
trq11
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
JP4149281A
Other languages
Japanese (ja)
Other versions
JPS6363125B2 (en
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 JP4149281A priority Critical patent/JPS57155813A/en
Publication of JPS57155813A publication Critical patent/JPS57155813A/en
Publication of JPS6363125B2 publication Critical patent/JPS6363125B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/083—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements in transistor amplifiers

Landscapes

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

Abstract

PURPOSE:To suppress harmonics generated at saturation, by adding an output drive limit circuit. CONSTITUTION:When a positive input signal is applied to a terminal (a), a current flowing to a transistor (TR)Q6 is decreased and the collector potential of a TRQ5 is increased. The potential at a bootstrap terminal (e) is further increased, because the potential of an output terminal (d) is increased with the conduction of TRs Q10 and Q11 and the potential increase is fed back to a terminal (e) with a bootstrap capacitor C4. Thus, a VCE of TRs Q5 and Q10 can drive a TRQ11 with a sufficient margin. The collector potential of the TRQ5 is increased and the output TRQ11 reaches the saturation, then a TRQ3 is conductive and the collector current of the TRQ5 by-passes to ground and the TRQ11 is not driven further. Thus, no steep output trailing is caused and generation of harmonics is less, because oversaturation is not made. In this case, since the terminal (e) is sufficiently higher in potential than the power supply voltage, a diode D1 is conductive and a bias voltage higher than the power supply voltage by the potential drop of a resistor R4 is given to the base of the TRQ3.
JP4149281A 1981-03-20 1981-03-20 Power amplifier Granted JPS57155813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4149281A JPS57155813A (en) 1981-03-20 1981-03-20 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4149281A JPS57155813A (en) 1981-03-20 1981-03-20 Power amplifier

Publications (2)

Publication Number Publication Date
JPS57155813A true JPS57155813A (en) 1982-09-27
JPS6363125B2 JPS6363125B2 (en) 1988-12-06

Family

ID=12609843

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4149281A Granted JPS57155813A (en) 1981-03-20 1981-03-20 Power amplifier

Country Status (1)

Country Link
JP (1) JPS57155813A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59140706A (en) * 1983-01-31 1984-08-13 Rohm Co Ltd Amplifier circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59140706A (en) * 1983-01-31 1984-08-13 Rohm Co Ltd Amplifier circuit
JPH0374527B2 (en) * 1983-01-31 1991-11-27

Also Published As

Publication number Publication date
JPS6363125B2 (en) 1988-12-06

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