Strange. I thought I've corrected a few typos, but apparently I didn't. * "noise it can tolerate is around 100 milivolts" (should be: few hundreds milivolts).

Strange. I thought I've corrected a few typos, but apparently I didn't. * "noise it can tolerate is around 100 milivolts" (should be: few hundreds milivolts). * "the fifth harmonic of a 100 MHz square wave is 1 GHz" (should be: 200 MHz)