DocumentCode
2965707
Title
Two-frequency synthesizer with shaped quantization noise [for impedance bridges]
Author
Small, G.W. ; Fiander, J.R.
Author_Institution
Nat. Meas. Lab., CSIRO, Lindfield, NSW, Australia
fYear
1998
fDate
6-10 July 1998
Firstpage
502
Lastpage
503
Abstract
Some impedance bridges require a signal source of accurately known frequency, and sinusoidal waveform of good spectral purity. These requirements are here met by combining the functions of synthesis and waveform generation to produce a signal that is free from phase modulation. Sidebands resulting from quantization errors are shaped to reduce those adjacent to the signal, at the expense of more remote sidebands where filtering is more effective.
Keywords
bridge circuits; digital-analogue conversion; direct digital synthesis; electric impedance measurement; quantisation (signal); waveform generators; ADC; DAC; accurately known frequency; code generation algorithm; feedback gain; impedance bridges; look-up table; shaped quantization noise; shaped sidebands; signal source; sinusoidal waveform; spectral purity; stepped waveform; two-frequency synthesizer; waveform generation; Bridges; Filtering; Frequency; Impedance; Noise shaping; Phase modulation; Quantization; Signal generators; Signal synthesis; Synthesizers;
fLanguage
English
Publisher
ieee
Conference_Titel
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location
Washington, DC, USA
Print_ISBN
0-7803-5018-9
Type
conf
DOI
10.1109/CPEM.1998.700026
Filename
700026
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