Direct-digital synthesis using delta-sigma modulated signals

Abstract— A new technique that use of DSM signal in a common technique for dgitally synthesizing an arbitrary waveform, which is generally known as direct-digital synthesis (DDS), is described in this paper. In this way, a DDS frequency resolution is not restricted to the phase resolution in DDS and requires no phase truncation technique. As a simulation result, low-pass filtered output waveform is smooth at a lower frequency with respect to clock frequency. At lower frequency, this technique leads to higher spurious-free-dynamic-range than that of ideal linear interpolator output with same phase resolution. Therefore, proposed combination of DSM signal and basic DDS is able to realize high frequency resolution and high spectral-purity at lower frequency band by small circuits.

• Type: Conference
• Year: 2005
• Where: ISCAS
• Authors: Yuichiro Orino, Minoru Kuribayashi Kurosawa, Takashi Katagiri
• Keywords: DDS Frequency Resolution, Frequency Resolution, ISCAS 2005, Lower Frequency