Disclosed herein, among other things, are methods and apparatus related to radio frequency (RF) ablation catheters. The present subject matter provides an ablation catheter system including an ablation catheter, multiple RF electrodes positioned along a distal end of a catheter, an electrical stimulation generator, and a control circuit electrically connected to the stimulation generator. According to various embodiments, the RF electrodes are each connected to the stimulation generator using a switch, and the control circuit is configured to distribute RF power from the stimulation generator to the RF electrodes using the switches to provide ablation therapy.