Digital generation of very-wide-band FM

A digital method of generating very-wide-band FM (VWBFM) signal, based on a novel "time-domain FM" (TDFM) concept, has been described. Uniform samples of the sinusoidal carrier, stored in a read-only memory (ROM), are retrieved in synchronization with the zero-crossings of an FM square wave and interpolated using a tracking low-pass filter (TLPF).