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...
The amplifier has less than 1.5 $mu{hbox{V}}$ offset at a 16-kHz chopper frequency, a unity gain frequency of 1.3 MHz with a 50-pF load, and draws 700 $mu{hbox {A}}$ from a 5-V supply. The amplifier was realized in a 0.7 $mu{hbox {m}}$ CMOS process, and has an ...
This paper describes a CMOS instrumentation amplifier with a noise density of 42nV/νHz and 640kHz GBW at 325µA supply current. It achieves 2.5µV input offset voltage, 130dB CMRR, and 114dB PSRR by the combined use of chopping, auto-zeroing and a current-feedback topology.关键词:...
A Low-Noise Low-Offset Chopper-Stabilized Capacitive-Readout Amplifier for CMOS MEMS AccelerometersingentaconnectDigest of Technical Papers of the Solid State Circuits Conference
As a result of the quite long pulses emitted by this laser, coherent octave-spanning SC generation for CEO beat detection could not be directly achieved from the laser output, but required external amplification using an Yb:fiber amplifier and pulse compression. An average power of 300 mW ...
Cancellation of Amplifier Offset and 1/f Noise: An Improved Chopper Stabilized Technique Cabrini, F. Maloberti, and G. Martini, “Cancellation of Amplifier Offset and 1/f Noise: An Improved Chopper Stabilized Technique,” IEEE Trans. on ... Agnes, A,Cabrini, A,Maloberti, F,... - 《...
In this paper, a very low-offset continuous time amplifier has been presented. It has the fully differential structure and uses an Auto-zeroed offset stabilization technique. This structure consists of two phases in which the offset value is sampled in the first phase and then subtracted from ...
In this paper, a very low-offset continuous time amplifier has been presented. It has the fully differential structure and uses an Auto-zeroed offset stabilization technique. This structure consists of two phases in which the offset value is sampled in the first phase and then subtracted from ...
A chopper-stabilized amplifier includes a main signal path having first and second chopping circuits at the inputs and outputs of a transconductance amplifier, and an auto-correction feedback loop. The feedback loop includes a transconductance amplifier connected to amplify the chopped output from ...