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Audio Signal amplifier circuit and electrnic appts. having same

An amplifier circuit, audio signal technology, applied in low-frequency amplifiers, amplifiers, single-ended push-pull amplifiers, etc., can solve the problems of increased crossover distortion and oscillation, and achieve the effect of reducing signal distortion

Inactive Publication Date: 2004-10-27
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After this setting, the final stage is driven, so the number of poles (knee points) on the Bode plot (a graph of frequency versus total gain) increases, and if driven at low voltage, the crossover distortion increases, and if the output increases, is likely to oscillate

Method used

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  • Audio Signal amplifier circuit and electrnic appts. having same
  • Audio Signal amplifier circuit and electrnic appts. having same
  • Audio Signal amplifier circuit and electrnic appts. having same

Examples

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Embodiment Construction

[0021] in figure 1 Among them, 10 is the audio output circuit. The audio output circuit 10 is composed of the following components: a driver stage circuit 4 including differential amplifier circuits 1, 2 and 3; an output stage circuit 5 of C-MOSFET driven by the driver stage; and resistors R1, R2, R3, and R4. In addition, 5a is the output terminal of the output stage circuit 5, and 4a is the input terminal of the driver stage circuit 4.

[0022] Differential amplifier circuits 1, 2 and 3 are constructed according to the same circuit structure, respectively, receiving power from the power supply line +VDD (assuming the power supply voltage is +VDD), and under the voltage between the power supply voltage +VDD and the ground GND operating. The differential amplifier 1 is an amplifier circuit that operates in the same phase, in which the (-) input side (inverting input side) is used as an input terminal, and the (-) input side is connected to the connection point N1 of the series cir...

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PUM

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Abstract

The present invention is provided with an audio signal amplifier circuit and an electrnic apparatus having same. The audio signal amplifier circuit includes a first, a second and a third differential amplifier which operate at a source voltage with respect to a reference voltage or a voltage between these; an output stage having a first and a second transistor driven complimentarily; a first resistor connected to an input terminal; a second resistor connected to an output of the first differential amplifier circuit; and a first and a second feed back resistor connected to an output terminal of the output stage circuit.

Description

Technical field [0001] The present invention relates to an audio signal amplifier circuit and an electronic device having the circuit, and more particularly, to an audio signal amplifier circuit for portable type electronic devices such as cellular phones, non-mobile phones, and portable terminal devices and In an audio system of an electronic device such as a personal computer, the audio signal amplifier circuit can reduce signal distortion even under a relatively low voltage drive, and is suitable for being formed in an integrated circuit with a wide dynamic range. Background technique [0002] Traditionally, many audio systems used for portable type electronic devices such as cellular phones, non-mobile phones, and portable terminal devices and electronic devices such as personal computers operate at relatively low voltages, for example, approximately DC 6V The power supply voltage may be lower than this voltage, which causes the problem of narrowing its dynamic range. [0003...

Claims

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Application Information

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IPC IPC(8): H03F3/30
CPCH03F3/303E05B15/16E05B53/00E05B2015/1692
Inventor 稻垣亮介
Owner ROHM CO LTD
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