AVL F-FEM-DAC User Manual

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Frequency Outputs
30
4.2.3 Accuracy of the Frequency Synthesis
Different frequency errors occur during frequency synthesis,
depending on the value (frequency or duty cycle) that is varied. These
errors include:
n Frequency errors:
caused by quartz inaccuracy and quantization (limited resolution
due to limited counter width)
n Duty-cycle errors:
caused by quantization (limited resolution due to limited counter
width)
The selected update rate does not have an impact on the frequency
generated, but should be in a sensible relation. For example, it does
not make sense to generate frequencies of several Hz and then have
them recalculated every millisecond.
As a rule of thumb:
The errors and their interrelationships are shown in the diagrams
below.
Output Frequency > Update Frequency
Fig. 20 Relationship between duty-cycle error and frequency

AVL F-FEM-DAC Specifications

General

Brand	AVL
Model	F-FEM-DAC
Category	Measuring Instruments
Language	English