A signal processor and method of signal processing is disclosed. The patterned silicon layer is oxidized to form the entire surface of the silicon layer to a specific thickness by using an oxide layer. The cell groups are arranged in a repeating pattern such that a cell having a site assigned different frequency is interposed between cell groups assigned the same frequency, thereby constituting a minimum unit area to be repeated. The reinforcing flanges include extension edges disposed at the bend portion and extending at least from the one end of the main rod toward the first attachment section, the extension edges being bent outwardly from top edge portions of the reinforcing flanges in a direction crosswise to a remainder thereof. The level shifting circuitry may include a first transistor and a second transistor.