Can anyone recommend me a FET input op amp which can sense inputs down to the negative rail and has an output which can swing down to the negative rail too?
I intend to use this amplifier with a single rail supply, so the "negative" voltage will be ground (0V). I am going to use it as a buffer/voltage follower in a sample and hold circuit (I have attached a simple diagram) This is why I require the high input impedance which a FET op amp has, however a standard transistor op amp would be fine if it has as high an input impedance as a FET op amp.
Supply voltage = 12V
Input = 40mV to 3V
I intend to use this amplifier with a single rail supply, so the "negative" voltage will be ground (0V). I am going to use it as a buffer/voltage follower in a sample and hold circuit (I have attached a simple diagram) This is why I require the high input impedance which a FET op amp has, however a standard transistor op amp would be fine if it has as high an input impedance as a FET op amp.
Supply voltage = 12V
Input = 40mV to 3V
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