KD5NWA wrote:
[snip]
The reason is fairly simple, real switches do not turn on and off
instantaneously, if you have switches turn on while another turns
from on to off, the timing difference will cause the switches to have
a short circuit for a brief period. By having less than 25% on the
waveform you are insuring that the switches are all off before
turning one on, and thereby avoid that brief short.
[snip]
That's one of the reasons why I chose the ADG704 for my QSD. From the datasheet :
PRODUCT HIGHLIGHTS
.................
7. Break-Before-Make Switching Action.
.................
73 Alberto I2PHD
Alberto I2PHD