| http://www.w3.org/ns/prov#value | - a DC-to-AC converter having n+1 bytes, wherein n is a positive integer, the DC-to-AC converter is coupled to a control terminal of the switch and outputs a variable voltage to turn on the switch to make the switch generate a data current, and the DC-to-AC converter changes a magnitude of the variable voltage to control a magnitude of the data current.
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