An electronic component includes a substrate; a piezoelectric material layer supported directly or indirectly by the substrate; a first electrode arranged on a surface of the piezoelectric material layer on an opposite side of the substrate; and a second electrode arranged on a surface of the piezoelectric material layer on the substrate side. A removable battery may provide power to the portable computer. A second evaluation tree configured to evaluate the dynamic node to a second value in response to one or more second input signals in accordance with the second evaluation clock signal.