Originally posted by beenthere+Nov 27 2004, 08:32 PM--><div class='quotetop'>QUOTE(beenthere @ Nov 27 2004, 08:32 PM)</div><div class='quotemain'>Hi,
Technical English can be hard to understand.
The "rails" thet are speaking about are the power supply voltages. This term comes from the past, when it was customary to draw the positive voltage line and the negative voltage line as the upper and lower lines on schematics with the circuit symbols in between. As such, the voltage supply lines were parallel and spaced apart like train track rails.
An amplifier cannot swing its output as far as the voltage supply potentials. "Rail to rail" amps have charge pumps incorporated to boost the internal voltage such that the output waveform can equal the power supply potentials.
Subharmonics are those harmonics whose frequencies lie below that of the fundamental. For 100 Hz, the first even subharmonic is 50 Hz.
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