Timeline for RF amplifier, why don't two cascaded amplifiers work?
Current License: CC BY-SA 3.0
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| Apr 14, 2015 at 15:40 | comment | added | Warren Young | Also, I doubt the LM7171 has a problem driving 51Ω anyway. It's an unusually studly op-amp, a small cable-driver, really. I think the real issue is trying to use a 200 MHz IC on solderless breadboard. Madness. | |
| Apr 14, 2015 at 15:24 | comment | added | Warren Young | Are you sure that's what's going on here? I haven't bothered to trace out the breadboard (that's what schematics are for!) but I read the schematic as talking about cable impedance, which shouldn't apply for two op-amps right next to each other. What's the characteristic impedance of solderless breadboard? Now, if the OP has gone and tried to do impedance matching with a 51R to ground between the two stages, then yeah, he's going to have problems. | |
| Apr 14, 2015 at 15:15 | history | answered | Andy aka | CC BY-SA 3.0 |