Good afternoon,
I've recently incorporated the AD8229 part into a prototype design, we are using this part in several places. I was a bit shocked when I saw the commercial part was priced at $220 per part. Needless to say, I'm looking for alternatives…
I have been using the Analog Devices version of Multisim for a while and just downloaded version 12. I modeled a simple amplifier using the AD8429.
Signal on the negative input, positive input grounded, +/-15V, gain resistor of 60.4 ohms for a gain of…
低噪声仪表放大器AD8229
专门针对高温工作环境而设计非常适用于地下钻探作业，采用介质隔离工艺，以避免高温时产生漏电流。所选设计架构可以补偿高温时的低VBE电压。尤为擅长测量微小信号，可提供业界领先的1 nV/√Hz输入噪声性能。此外AD8229具有高共模抑制比（CMRR），可防止干扰信号破坏数据采集。CMRR随着增益提高而提高，能够在最需要的时候提供高抑制性能。并且AD8229还是目前最快的仪表放大器之一。采用电流反馈型架构，能够在高增益时提供高带宽，比如G = 100时，带宽为1.2 MHz…
A little more information for other people facing a similar problem. I was able to get my output noise measurement down to 162 nV/rtHz ( I had some extra resistance at the input that wasnt exactly matching the circuit above).
I also noticed the datasheet…
A few extra comments:
- The RG noise is actually scaled by (Gain -1)/Gain in the equation Scott gave and in the AD8229 datasheet. For most gains, this is inconsequential, but if you are doing calculations at very low gains, this can matter. This is why…
Percy,
I would use an Instrumentation Amp with a stable 1V on one side. Look at AD8421, AD8428, AD8229, or AD8226.
Harry
Two other in-amps that come close to enough bandwidth are the AD8229 and AD8429. Gain of these parts is set by an external resistor.
