Title :
A fixed-frequency synthesizer with enhanced signal-to-noise ratio
Author :
Small, Greig W. ; Fiander, John R.
Author_Institution :
Nat. Meas. Lab., CSIRO, Lindfield, NSW, Australia
fDate :
4/1/1999 12:00:00 AM
Abstract :
Frequency-dependent impedance bridges require excitation signals of precise frequency, low harmonic content, and high SNR in the passband of the detector. A two-frequency synthesizer with high signal-to-noise ratio and negligible harmonic distortion has been developed for this purpose. In generating the stored waveform, quantization noise near the signal is depressed at the expense of other parts of the spectrum where analog filtering is more effective
Keywords :
bridge circuits; electric impedance measurement; frequency synthesizers; quantisation (signal); waveform generators; depressed quantization noise; enhanced signal-to-noise ratio; fixed-frequency synthesizer; frequency-dependent impedance bridges; lookup table; low harmonic content; noise shaping; precise frequency excitation signals; stored waveform generation; two-frequency synthesizer; Bridges; Detectors; Frequency; Harmonic distortion; Impedance; Passband; Power harmonic filters; Signal generators; Signal to noise ratio; Synthesizers;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
