A bandgap voltage reference circuit that utilize a two-stage transconductance amplifier as a feedback control loop to improve the accuracy and stability of the output reference voltage without the need for an additional biasing circuit. Original data used in connection with one or more applications is analyzed in order to determine one or more distribution characteristics for the original data. The switch matrix includes access switches that connect subelements to bus lines and matrix switches that connect subelements to subelements. The battery pack may also serve as an extendible platform by providing additional integrated communication interfaces andor processors that can be utilized by the mobile communication device to extend its communication andor processing capabilities.