AD8691不错的选择，收藏了

AD8692用AD8691的spice模型，AD8692是双运放，AD8691是单运放。

其他器件如果在LTspice中找不到，可以到ADI官网上下载相关spice模型（.cir文件），每一个运放的页面基本都能找到相关的spice模型（一般在Datasheet下面）。然后将cir文件导入到LTspice中自建电路模型。

附件中是如何在LTspice中导入模型文件的方法：
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Thank you for a thorough explanation.

I have looked further at your catalog of op-amps. Since I am designing a portable unit, I examined the following, with 5 V supply:

AD8605/AD8606/AD8608, AD8691/AD8692/AD8694, AD8655/AD8656, and the ADA4075-2.

Hi hulala,

Because the AD8691 is a CMOS amplifier, it should have very high input impedance. I do not think there will be any problems with interfacing this to the ADMP411. I have communicated with the engineer of this part to try and see whether I…

Hi Mika,

We currently don't have ADA4530-1 in a die level and I'm  not sure if we will have in the near near future. However, i found these few devices with 1pA typical bias current operational amplifiers in die/chipscale package. We have AD8691…

CEI,

The ADP1621 boost controller can be used as you describe for an asynchronous design (one switch, one diode) with or without isolation.

The ADP1828 buck controller can be used as a 2 low side switch flyback if you do not need isolation.

Here is…

The first thing to compare is the Signal-to-Noise and Distortion (known as SINAD) of the ADC to the distortion and noise (THD+Noise) of the op amp. You want the SNR+THD of the amplifier to be less  than (i.e., more dB)that of the ADC. For example, the…