Systems and methods are disclosed to dissipate heat from a semiconductor substrate. The system and method utilize a dual mode RS decoder for FEC decoding. The system also includes a fan coupled to the enclosure and configured to provide a flow of cooling air through the enclosure to cool the electronic devices. A higher efficiency of the radiation evaluation is enabled and, particularly in nuclear medical diagnostic methods, the radiation exposure of the patient can be distinctly reduced. Finally, the filer removes the undesired noise to obtain the desired synthesized frequency signal. The circuit is arranged such that the ratio of the current densities in the two transistors varies with temperature, such that the difference voltage includes a residual component which approximately compensates bandgap curvature error.