| 一种增益可控音频前置放大器电路的设计 |
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| 引用本文： | 潘文光,于云丰,马成炎,叶甜春.一种增益可控音频前置放大器电路的设计[J].微电子学,2010,40(2). |
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| 作者姓名： | 潘文光 于云丰 马成炎 叶甜春 |
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| 作者单位： | 1. 中国科学院,微电子研究所,北京,100029
2. 杭州中科微电子有限公司,杭州,310053 |
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| 基金项目： | 国家科技重大专项(2009ZX02304-003-1) |
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| 摘 要： | 设计了一种基于0.5μm CMOS工艺的增益可控音频前置放大器电路。该电路采用直流音量控制方式控制前置放大器的增益,进而实现整体音频放大器的音量控制。外部输入的直流模拟电压经过片内模数转换器转换成数字控制信号,控制前置放大器的输入电阻与反馈电阻的比值,从而实现前置放大器的增益控制。该放大器能够实现32档的音量控制范围,增益从-50 dB变化到25 dB,电路版图面积为1.2 mm×0.8 mm。
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| 关 键 词： | 音频功率放大器 音量控制 前置放大器 |
Design of Variable-Gain Pre-Amplifier Circuit for Audio Power Amplifier |
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| PAN Wenguang,YU Yunfeng,MA Chengyan,YE Tianchun.Design of Variable-Gain Pre-Amplifier Circuit for Audio Power Amplifier[J].Microelectronics,2010,40(2). |
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| Authors: | PAN Wenguang YU Yunfeng MA Chengyan YE Tianchun |
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| Affiliation: | 1.Institute of Microelectronics/a>;The Chinese Academy of Sciences/a>;Beijing 100029/a>;P.R.China/a>;2.Hangzhou Zhongke Microelectronics Co./a>;Ltd./a>;Hangzhou 310053/a>;P.R.China |
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| Abstract: | A variable-gain pre-amplifier circuit for audio power amplifier was implemented in 0.5-μm CMOS process. In this circuit, DC volume control operation mode was adopted to control gain of the pre-amplifier, and by adjusting the gain of the pre-amplifier, volume of the whole audio power amplifier could be controlled. The input DC analog voltage signal was converted to digital control signals with an on-chip A/D converter, which was used to adjust ratio of feedback resistance to input resistance, thus realizing gain control of the pre-amplifier. The amplifier could offer a 32-step DC volume control from -50 dB to 25 dB. The circuit occupies a layout area of 1.2 mm×0.8 mm. |
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| Keywords: | Audio power amplifier Volume control Pre-amplifier |
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