发明名称 |
Direct digital synthesizer driven phase lock loop spectrum analyzer |
摘要 |
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.
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申请公布号 |
US5818215(A) |
申请公布日期 |
1998.10.06 |
申请号 |
US19960634429 |
申请日期 |
1996.04.18 |
申请人 |
ADVANTEST CORPORATION |
发明人 |
MIYAMAE, YOSHIAKI;TAKAOKU, HIROAKI;AOYAMA, OSAMU |
分类号 |
G01R23/173;(IPC1-7):G01R13/24 |
主分类号 |
G01R23/173 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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