Title :
A synchronized two-phase sinewave generator for AC metrology system compensations
Author :
Callegaro, Luca ; D´Elia, Vincenzo
Author_Institution :
Ist. Elettrotecnico Nazionale Galileo Ferraris, Torino, Italy
fDate :
4/1/2000 12:00:00 AM
Abstract :
A slave audio two-phase sinewave generator, which can be directly synchronized to a master generator, is described here. It can be used in ac metrology setups to provide additional “compensation” signals, traditionally derived with expensive multidecade inductive voltage divider networks. The generator is based on two direct digital synthesis (DDS) chips, programmed via the parallel printer PC interface; their clock is provided by a phase-locked loop circuit, which ensures frequency and phase synchronization of the DDS outputs with the master generator. The synchronization reference signal can be provided via an optical link reference channel, which avoids interference and ground loops. In its present implementation, the output voltage is Vpeak =10 V, frequency range 500 Hz-4 kHz. Total harmonic distortion is contained to -65 dB, and amplitude stability is better than 500 μV/V over 24 h
Keywords :
computerised instrumentation; digital phase locked loops; direct digital synthesis; error compensation; stability; synchronisation; waveform generators; -65 dB; 10 V; 24 h; 500 Hz to 4 kHz; AC generators; AC metrology; DDS chips; amplitude stability; compensation; direct digital synthesis chips; frequency phase synchronization; master generator; multidecade inductive voltage divider networks; optical link reference channel; parallel printer PC interface; phase-locked loop circuit; slave audio two-phase sinewave generator; synchronization reference signal; synchronized two-phase sinewave generator; total harmonic distortion; AC generators; Circuit synthesis; Clocks; Frequency synchronization; Master-slave; Metrology; Network synthesis; Printers; Signal synthesis; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
