Multiple Frequency Generator with Single Inductor and Capacitor Bank

In this paper, the multiple frequency generator (MFG) with single inductor and capacitor bank is proposed. The MFG instantly changes the output frequency with registered code. Engine calibration takes 16 ms. After calibration, the output frequency is adjusted according to user's control. The spreading spectrum clock generation is included to reduce the power of target frequency component. Spreading occurs within 5000 ppm of the target frequency. The proposed capacitor bank improves the efficiency of frequency change by coarse, fine and coefficient control.