Disclosed herein is a back-bias voltage regulator circuit for regulating a back-bias voltage used to control leakage current in at least one transistor within a primary circuit. In one example, the system receives feedback information from a drilling rig and calculates an estimated position of a drill bit in a formation based on the feedback information. The transmitting connector includes a light emitting device for each optical fiber and a flexible printed circuit board holding electronic circuitry for converting electrical signals into optical signals. The first and second pluralities of electrodes are configured to generate electrostatic forces in response to voltages applied. The systems and methods cause the electrode structure to apply energy to heat the tissue region while the view image is displayed on the display screen.