A combination bulldozer and pipelayer includes a front mounted blade, or scoop, and a side mounted pipelayer attachment. The MEMS varactor is configured to be actuated exclusively by the output signal to effectuate a change in capacitance of the MEMS varactor. According to the method, at least one bidding group is registered in the central computer. The N-type and P-type heavily doped impurity regions are electrically connected to an inputoutput pad.