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E7E12

What are the main blocks of a direct digital frequency synthesizer?

Select	Answer
A	A variable-frequency crystal oscillator, phase accumulator, digital to analog converter and a loop filter
B	A variable-frequency oscillator, programmable divider, phase detector and a low-pass antialias filter
C	A stable voltage-controlled oscillator, programmable divider, phase detector, loop filter and a digital to analog converter
D	A phase accumulator, lookup table, digital to analog converter and a low- pass antialias filter

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