失调稳态一种用来设计高精度运算放大器的技术。基本工作原理如下图所示。 Fig1 The concept of the offset-stabilized operational amplifier Gm2为主放大器,其失调为Vos。Gm4假想为是一个零失调的运放,它用来对Gm2的Vos进行处理。Gm3可以看作主放大器的辅助输入。Gm4在Gm3输入端产生一个输入电压,Gm3再产生一个...
Fig 1 Chopper offset-stabilized amplifier 图1是一个斩波失调稳态放大器,Gm4决定整个运放的低频noise和offset。LPF是用来抑制Gm4斩波后带来的纹波(ripple),否则在最后输出波形上表现出很多高幅值毛刺。斩波后的残余失调电压Vos,res在上一篇文章中已经给出公式了。 Fig 2 Noise in chopper-stabilized amplifiers 图2...
In this paper, an offset-stabilized operational amplifier is described. The amplifier employs a chopper amplifier in a low frequency path to cancel the offset of a wide-bandwidth amplifier. A sample-and-hold circuit is used to reduce the chopper ripple, and the low frequency path is also offs...
operational amplifiersIn this paper, an offset-stabilized operational amplifier is described. The amplifier employs a chopper amplifier in a low frequency path to cancel the offset of a wide-bandwidth amplifier. A sample-and-hold circuit is used to reduce the chopper ripple, and the low frequency...
Precision op amps are widely used in instrumentation, automotive, and industrial applications. This thesis presents the design and characterization of a low-power precision operational amplifier that uses "ping-pong" autozero architectur... P Xi 被引量: 3发表: 2008年 加载更多研究...
The first design is a high precision operational amplifier focusing on the voltage offset. It is a continuous time auto-zero stabilized architecture, that leads to a typical input offset voltage of 2 /spl mu/V-100nV//spl deg/C. The amplifier with its output buffer consumes 5mW at a ...