Hi all!!

for building a precise and efficient Sample and Hold circuit, i found the following application note in AD website

http://www.analog.com/en/circuits-from-the-lab/cn0058/vc.html

But the operating voltage range of the op amp used (AD8672) is…

Hi

I have a question.

Does AD8676 will occur "phase reversal" when the input voltage exceeds the common mode voltage range within supply voltage range?

Ex. AD8672  D/S Page 1  "No phase reversal"

In this regard, the same as the

Im using the AD8672 on the dual op amp evaluation board to provide 2 output channels.

Both amplifier A and B are given the same 30us input signal. Amplifier A is behaves normally as long as Amplifier B is not connected to a scope (50ohm termination)…

I already destroy more then 10 pcs AD8672 in my experiment.

I just use it as a low noise unit gain buffer.

Supply voltage are +/-12V

IN+ is connected to the reference output from LM399.
IN- and output is shorted to provide the negative supply voltage…

想請問一下我使用AD8672 spice model  去跑Open-Loop Gain and Phase Shift vs. Frequency &  Output Impedance vs. Frequency  這兩個參數,RUN出來的參數為何與 DATASHEET上面所標示的是不一樣的,測試條件與Datasheet一樣 , 詳細測試數據在附件,thanks!!!

Hi there,

  We are using the SPICE model of AD8672 to simulate the open-loop gain & phase shift vs. frequency & output impedance vs. frequency. It turns out to be quite different from the listed in data sheet. Attached is the test result for your information…