JPS5724109A - Pulse width modulation amplifier - Google Patents

Pulse width modulation amplifier

Info

Publication number
JPS5724109A
JPS5724109A JP9914580A JP9914580A JPS5724109A JP S5724109 A JPS5724109 A JP S5724109A JP 9914580 A JP9914580 A JP 9914580A JP 9914580 A JP9914580 A JP 9914580A JP S5724109 A JPS5724109 A JP S5724109A
Authority
JP
Japan
Prior art keywords
pulse width
width modulation
variable resistor
resistor
signal
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
JP9914580A
Other languages
Japanese (ja)
Inventor
Yuji Hojo
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP9914580A priority Critical patent/JPS5724109A/en
Publication of JPS5724109A publication Critical patent/JPS5724109A/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
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers

Landscapes

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

Abstract

PURPOSE:To increase the efficiency by making a driving resistor of an output circuit in power amplification of a pulse width modulation signal as a variable resistor, and interlocking it with the variable resistor for analog sinal level adjustment. CONSTITUTION:An audio signal from an audio signal source (b) is imputted to an integrator 3 with a carrier signal via a variable resistor VR3 for level adjustment and outputted as a pulse width modulation signal (a) via a comparator (not shown). An output circuit consisting of transistors Q1, Q2, diodes D1, D2 variable resistors VR1, VR2 and capacitors C1, C2 amplifies the signal (a), this output is demodulated at a low-pass filter 7 and drives a speaker 9. The variable resistors VR1, VR2 as the driving resistor anr interlocked with a level adjusting variable resistor VR3 and the efficiency can be made maximum in conforming with the maximum output determined by the volume position.
JP9914580A 1980-07-18 1980-07-18 Pulse width modulation amplifier Pending JPS5724109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9914580A JPS5724109A (en) 1980-07-18 1980-07-18 Pulse width modulation amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9914580A JPS5724109A (en) 1980-07-18 1980-07-18 Pulse width modulation amplifier

Publications (1)

Publication Number Publication Date
JPS5724109A true JPS5724109A (en) 1982-02-08

Family

ID=14239524

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9914580A Pending JPS5724109A (en) 1980-07-18 1980-07-18 Pulse width modulation amplifier

Country Status (1)

Country Link
JP (1) JPS5724109A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103107784A (en) * 2011-11-09 2013-05-15 中国科学院微电子研究所 D-type radio-frequency power amplifying circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103107784A (en) * 2011-11-09 2013-05-15 中国科学院微电子研究所 D-type radio-frequency power amplifying circuits

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