JPS5545227A - Power amplifier - Google Patents

Power amplifier

Info

Publication number
JPS5545227A
JPS5545227A JP11826078A JP11826078A JPS5545227A JP S5545227 A JPS5545227 A JP S5545227A JP 11826078 A JP11826078 A JP 11826078A JP 11826078 A JP11826078 A JP 11826078A JP S5545227 A JPS5545227 A JP S5545227A
Authority
JP
Japan
Prior art keywords
trq
input
circuit
capacitor
stopping
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
JP11826078A
Other languages
Japanese (ja)
Other versions
JPS6227567B2 (en
Inventor
Masayuki Takori
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 JP11826078A priority Critical patent/JPS5545227A/en
Publication of JPS5545227A publication Critical patent/JPS5545227A/en
Publication of JPS6227567B2 publication Critical patent/JPS6227567B2/ja
Granted legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To eliminate a pop noise at a power supply time by providing a Tr which divides the collector current of a transistor Tr, which drives the output SEPP circuit, and gives the divided current to input coupling capacitor C and DC stopping capacitor C.
CONSTITUTION: Input signals from input terminal IN are amplified through input capacitor HC1 and the input differential amplifier consisting of TrQ3∼Q6 by TrQ7∼Q11 and are subjected power amplification by the SEPP circuit of TrQ12∼ Q15. The collector of TrQ9 for amplification of this circuit is connected to collectors of TrQ21 and Q22. Emitters of TrQ21 and Q22 are connected to DC stopping C2 and inputting C1 respectively, and the base of TrQ21 is biased higher than the base of TrQ22 by the bias circuit of TrQ23 and diodes D11 and D12. Therefore, C2 is higher than C1 in respect to charge voltages of C1 and C2 charged by currents of TrQ21 and TrQ22 which absorb the collector current of TrQ9, and the output of the differential amplifier does not appear in TrQ8, so that no transitional noise is generated in the power amplifier.
COPYRIGHT: (C)1980,JPO&Japio
JP11826078A 1978-09-26 1978-09-26 Power amplifier Granted JPS5545227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11826078A JPS5545227A (en) 1978-09-26 1978-09-26 Power amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11826078A JPS5545227A (en) 1978-09-26 1978-09-26 Power amplifier

Publications (2)

Publication Number Publication Date
JPS5545227A true JPS5545227A (en) 1980-03-29
JPS6227567B2 JPS6227567B2 (en) 1987-06-16

Family

ID=14732213

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11826078A Granted JPS5545227A (en) 1978-09-26 1978-09-26 Power amplifier

Country Status (1)

Country Link
JP (1) JPS5545227A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446441A (en) * 1980-09-22 1984-05-01 Olympus Optical Co., Ltd. Transient noise free type amplifier circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51155035U (en) * 1975-06-03 1976-12-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51155035U (en) * 1975-06-03 1976-12-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446441A (en) * 1980-09-22 1984-05-01 Olympus Optical Co., Ltd. Transient noise free type amplifier circuit

Also Published As

Publication number Publication date
JPS6227567B2 (en) 1987-06-16

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