Electronics > Projects, Designs, and Technical Stuff
Analog challenge:High power/high speed amplifier for physics experiment
Vovk_Z:
I would try lm7171 (with +- 15VDC power or higher). It seems to me there is no need in a large input current or voltage.
Kleinstein:
The bootstrapped amplifier circuit from LT looks odd. The 300 Ohms resistors in the feedback are rather low.
Bootstrapping circuit are known to not like larger loads and may tend to oscillate. Usually it takes some measures to slow down the variations in the supply (the FET internal capacitance may do the job).
David Hess:
--- Quote from: Kleinstein on July 12, 2020, 08:24:31 am ---The bootstrapped amplifier circuit from LT looks odd. The 300 Ohms resistors in the feedback are rather low.
--- End quote ---
The LT1210 is a 1 amp output current feedback amplifier so 300 ohm feedback resistors are a reasonable value.
Marco:
--- Quote from: boblevy4321@sbcglobal.net on July 11, 2020, 10:53:28 pm ---I have a design from LINEAR app note 87 that uses a lt1210 in a floating 100 volt arrangement .
--- End quote ---
That's so janky, I love it. Takes a twisted mind to come up with that.
duak:
I thought the 300R feedback resistor was a typo, but the op-amp isn't configured the way I thought it was. I chased down the original article where the op-amp is considered to be "suspended". The author goes a bit deeper in to the circuit operation.
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