| http://www.w3.org/ns/prov#value | - In this embodiment, an intermediate voltage in the variable range of the control voltage Vt, for example, 1.0 V is selected as the dc voltage VDC. Naturally, the dc voltage VDC is not limited to 1.0 V, and an arbitrary voltage such as 1.2 V or 1.4 V can be taken, if it is within the variable range of the control voltage Vt.
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