Title :
A multiphase direct-digital-synthesis sinewave generator for high-accuracy impedance comparison
Author :
Callegaro, Luca ; Galzerano, Gianluca ; Svelto, Cesare
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
Abstract :
We report on the realization and characterization of a dual-phase sinewave generator based on the direct-digital-synthesis technique, by using the new Analog Devices direct-digital-synthesizer AD9854. Particular attention is paid on the stability and accuracy of the sinewave amplitude in order to achieved high-accuracy impedance measurements. The sinewave frequency can be tuned in the range from 16 Hz to 16 kHz with a resolution <10 μHz and with a relative frequency stability of 10-8, whereas the sinewave long-term amplitude stability is better than 10-5 around the 10 V nominal. Signal amplitude, frequency, and phase are monitored and set by means of a personal computer
Keywords :
circuit stability; direct digital synthesis; electric impedance measurement; frequency stability; waveform generators; 16 Hz to 16 kHz; Analog Devices AD9854 DDS; direct-digital-synthesis sinewave generator; dual-phase sinewave generator; frequency stability; high-accuracy impedance comparison; long-term amplitude stability; multiphase DDS sinewave generator; sinewave amplitude accuracy; sinewave amplitude stability; sinewave frequency tuning; Character generation; Electrical resistance measurement; Frequency measurement; Impedance measurement; Particle measurements; Phase detection; Phase measurement; Stability; Voltage; Voltmeters;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-5890-2
DOI :
10.1109/IMTC.2000.848823
