Direct digital synthesizer driven phase lock loop spectrum analy

Details Direct digital synthesizer driven phase lock loop spectrum analy Direct digital synthesizer driven phase lock loop spectrum analy

1996-04-18

1998-10-06

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 7619, G01R 1324

Patent

active

058182152

ABSTRACT:
A spectrum analyzer converts frequencies of an input signal using a local signal from a local signal generator, detects the frequency converted outputs, and sweeps the frequencies of said local signal generated by said local signal generator, to obtain a frequency-based output, wherein said local signal generator comprises a digital direct synthesizer for incrementing the output frequency for every input clock, a variable frequency oscillator for outputting an oscillation output as said local signal and a phase locked loop for controlling the oscillation frequency of said variable frequency oscillator using the output of said digital direct synthesizer as a reference signal.

REFERENCES:
patent: 4965533 (1990-10-01), Gilmore

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