Bipolar design has been popular for a very long time. It continues to provide a device that is being used today in various forms. In standard bipolar processes, in combination with CMOS in BiCMOS processes, in high current designs, in high voltage with high current designs. Technology and device vendors keep improving their technologies and processes. Recently the advent of SiGe technology also provides a very high performance bipolar device. For the design engineer a set of identities which provides a way for simple hand calculations of the bipolar device for use in a circuit can be useful. Ultimately, the circuit design can be either breadboarded or simulated to evaluate performance. However, hand calculations can be and should be a first step. To facilitate this process the technical team at Signal Processing Group Inc., have recently released a brief paper on some useful bipolar design identities. This is available on the SPG website in the ” Engineer’corner”. Please visit http://www.signalpro.biz.