A Octuple Switching Structure with Code Independent for Frequency Conversion of High Performance D/A Converters

A new switching structure for decreasing signal dependent nonlinearity and upconverting in high performance D/A converters is addressed in this paper. The switching which receives a digital data input signal that is defined at data intervals can removing any substantial data dependency from this interaction. The logic circuit controls the switchs to be in one of a normal mode or multi-mixer mode that convert the input digital data signal into a mixed analog signal having a mixer frequency that is higher than the data frequency. Simulation results show that the new switch structure most extend the usable frequency spectrum into fifth to sixth Nyquist zone beyond conventional DACs.