A method for delivering RF energy to living tissue includes the steps of extending a guidewire to a tissue treatment site in a body. Unlike conventional bi-quad filter circuits, the invention provides a bi-quad filter configured with a single-bit BRM. In another exemplary embodiment, the heating element is formed of a plurality of separate heating segments which may be Individually controlled. The first stage optical switch section and the subsequent stage optical switch section switch a path of an optical signal according to a refractive index change caused by a carrier injection. A standby mode of operation of the memory is detected, and upon detection of the standby mode, the charging of the node is terminated and the word line drive voltage is generated using the first reference voltage. Digital values of the compressed digital representation for a triangle are fed back to the digital representation and are used for triangles processed subsequently.