I got it, thanks. Ad8651 seems to be proper. I need to use high resistance value resistors with the opamp and ad8651 seems to be a fit for that too.
Hi Harry ,
Thank you for the information with regards to this issue .
AD8651 has a simulation model have taken this as a reference .
With best regards and wishes
北京 中关村南大街 模拟放大以及电路设计 关注AD8651和其他精密运放
The 1.8V requirement is tough. There are not many op amps from any manufacturer that would be good for a mic preamp,
the reason being they are focused on very low power, so they are usually CMOS and have high flatband noise. For 2.7V
I suggest you can use the AD8651/AD8652 part. AD8651/AD8652 has a bandwidth of 50 MHz at 5V supply, has low noise density of 4.5 nV/√Hz at 100 kHz, has a typical offset voltage of 100 uV and slew rate of 41 V/μs. You can download its datasheet…
My name is charles.
I'd already used the the high speed video amp(AD811 and AD8057)and ultra low input current offset amp(AD549) respectively in my simple I-V converter circuit to get a singnal from PMT(2uA max) with Rf(100Mohm).
vi 相对 SIGREG 的输出为 0-5v。系统电压为24v，如果要实现对地电压为0-5V的缓冲输出，是必须用高电压运放来实现么
For a gain of 10, times 400kHz, times 10-20 margin, I would pick an op amp with a gbw of 40-80 MHz.
WRT noise, look at AN-940 for a table of low voltage noise op amps and a table of low current noise
op amps. Since you are running at a noise…
Here are some of FULLY CMOS designed Amplifiers in ADI portfolio.
1. AD8651/AD8652 (50 MHz, Precision, Low Distortion, Low Noise CMOS Amplifiers)
a. 2.7 V to 5.5 V Supply Operation
b. -0.1 V to (+Vs + 0.1 V) Input Voltage Range