Cardiac ablation systems and methods of their use and manufacture involve an ablation mechanism, a stabilizer mechanism, and a cinching mechanism that urges the ablation mechanism toward a patient tissue. The circuit comprises means for determining the integer portion of the logarithm, a lookup table module, a residual function module, an adder module and a register. A data line may be used to electrically connect the nodes of the communication network. Other components, such as another circuit board, a power supply, and block connectors, are placed in an adjacent enclosure, and the circuit boards in the two enclosures are electrically connected.