A digital controlled oscillator based on controlled phase shifting

A new architecture for a digitally controlled oscillator is presented. It is based on a controlled phase shifting principle and shows phase and frequency characteristics comparable to those of simple accumulator-type rate-multiplier-based circuits. An important feature of the proposed configuration is the possibility of a high clock frequency, also with conventional low-cost technologies. The oscillator is especially suitable for applications involving synchronization of different systems. Its transfer characteristic, frequency resolution, and phase performance are evaluated and discussed. Results from computer simulation and functional verification are reported