Reduction in Harmonic Distortion Through Use of Aperiodic Timing in Frequency Demodulation

Delay Based Frequency Modulation

“…3 and these results were obtained using the experimental parameters detailed in Table I. These parameters are consistent with those used in the previous, and related, publications [19,20]. Note, as given in this table, a modulator gain of , a maximum modulating signal amplitude of , and quantization of the modulating signal by a 16 bit D/A yields a delay resolution of .…”

“…The wide bandwidth demodulator described in [20] was used in the experimental setup. This demodulator uses aperiodic sampling to lower the level of harmonic distortion introduced and is based on a three phase integrate, sample and hold structure.…”

“…, and using the well known fact that the cosine function is insensitive to phase shifts of , it follows, as far as is concerned, that can equivalently be written as: (19) where a change of variable, , for the integral has been used. With the definition of as: (20) for and , the phase can be written as for and, hence, in general, Delay quantization resolution =…”