Title :
A high accurate signal generator based on direct digital frequency synthesis
Author :
Lan, Jiang ; Zhang, Zhonghua ; Li, Zhengkun
Author_Institution :
Tsinghua Univ., Beijing, China
Abstract :
In this paper, a four-channel high accurate sinusoidal signal generator to be used for the impedance measurements is presented. The whole system is constituted by the master-slave processor structure. Direct digital frequency synthesis (DDS) and the SOPC system are realized by the Nios II soft-core CPU embedded into the FPGA. The results demonstrate that the signal generator´s amplitude stability is with a relative uncertainty of 1.3 ×10-7 at frequency from 0 Hz to 1592 Hz when the phase is changed.
Keywords :
direct digital synthesis; electric impedance measurement; field programmable gate arrays; system-on-chip; FPGA; NiosII soft-core CPU; SOPC system; direct digital frequency synthesis; four-channel high accurate sinusoidal signal generator; frequency 0 Hz to 1592 Hz; impedance measurements; master-slave processor structure; Bridges; Clocks; Field programmable gate arrays; Frequency synthesizers; Impedance measurement; Master-slave; Read only memory; Signal generators; Signal synthesis; Stability;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-6795-2
DOI :
10.1109/CPEM.2010.5545341
