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首页> 外文期刊>IEEE Journal of Solid-State Circuits >A -90-dB THD rail-to-rail input opamp using a new local charge pump in CMOS
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A -90-dB THD rail-to-rail input opamp using a new local charge pump in CMOS

机译:使用新型CMOS本地电荷泵的-90dB THD轨至轨输入运算放大器

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This paper describes the principle and design of a CMOS rail-to-rail input operational amplifier with THD performance of -90 dB which is suited for high-quality audio systems. A new output stage has been used featuring an output suing that extends to either supply rail and is capable of driving a low ohmic load (32 /spl Omega/). The opamp, which is realized in a 0.5-/spl mu/m 3.3-V digital CMOS process, uses a standard two-stage Miller configuration. The rail-to-rail input functionality is achieved with a new area-efficient on-chip charge pump which provides the local supply voltage for the input differential pair. THD levels below -90 dB have not yet been shown with existing rail-to-rail techniques. This rail-to-rail input configuration also behaves independently of the common mode level with respect to transconductance and slewing characteristics.
机译:本文介绍了THD性能为-90 dB的CMOS轨到轨输入运算放大器的原理和设计,该放大器适用于高质量音频系统。已经使用了一种新的输出级,该输出级具有可延伸至任一供电轨的输出电源,并能够驱动低欧姆负载(32 / spl Omega /)。该运算放大器采用0.5- / spl mu / m的3.3V数字CMOS工艺实现,它使用标准的两级Miller配置。轨到轨输入功能是通过一种新型的面积高效片上电荷泵实现的,该电荷泵为输入差分对提供本地电源电压。现有的轨到轨技术尚未显示低于-90 dB的THD电平。在跨导和转换特性方面,该轨到轨输入配置的行为也独立于共模电平。

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