Andrea
Banned - aka HeavySoul - aka inconnu - aka Albert - aka layman - aka joe_average - aka altglos - aka Mr boobi - aka mikesand - aka blindbuy - aka The Well - aka yummy-fi
- Joined
- Dec 5, 2004
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A little bit blurred? I did it with Paintbrush.
The two resistors in the feedback loop are 1K ohm. The bandwidth limiting capacitor, being SMD, I can't know what value it could be. The series resistor at the output is 6.8 ohm. Of course, the impedances on the + and - inputs have been well balanced. The amplifier's circuit (of which my Paintbrush work of art represents only the output stage) uses a full ground plane, and proper bypassing on the power supply rails.
The LMH6654 looks like a higher performance chip than the LMH6642, with a very low distortion and a high output current, besides a 200 V/us slew rate.
My only concern is that its 250 MHz unity gain bandwidth (130 MHz at gain = +2 like here) could lead it to not be as stable as the LMH6642 in this circuit. Another small concern regards the LMH6654's input bias current of 5 uA - but that's not a real issue here I think. Do you think my concern about potential oscillation is founded at all? Or I'd better just try and see what happens...
Thanks!
