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This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies. |
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Discussion
LTSpice amplifier design
LTSpice is a heap of crap free program intended to sell LT parts, but it's the 1st time a practical circuit simulated in a spice program actually worked in real life.
The challenge was to amplify a differential signal in the microvolt range to an offset signal a microcontroller could capture. It did indeed work in simulation & real life. The real op-amp ended up a prime spec MAX412. The other lesson learned was not all RF chips output a logic level signal. Some output a microvolt range signal, even when they have an amplifier. They use a differential output. Absolutely nothing shows up on an oscilloscope or a breadboard amplifier because the breadboard has too much interference. These cases require soldering a board with a really schmick op-amp, differential pairs fully connected, grounds fully grounded, loads of decoupling caps. Only then does the coveted radar reflection appear on an oscilloscope. |
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