Thispaperpresentsareviewofconstraints,limitationfactorsandchallengestoimplementsub1VCMOSbandgapvoltagereference(BVR)circuitsintoday’sandfuturesubmicrontechnology.Moreover,weprovideinsightanalysisofBVRcircuitarchitecturesadesignercanrelayuponwhenbuildingCMOSvoltagereference.