Title:
FREQUENCY SIGNAL GENERATOR
Document Type and Number:
WIPO Patent Application WO/2015/136929
Kind Code:
A1
Abstract:
[Problem] To reduce spurious output of a DDS. [Solution] Providing an addition unit (5) for adding random noise to a digital signal outputted from a waveform data memory (2). A circuit for generating PN sequential data is used in a random noise generation unit (3), which is provided with a circuit for performing a data process so that digital values that constitute the noise are set to "-1" and "1." This data process prevents an offset (0.5) from being generated in the output value of the noise. A filter (4) is composed, for example, of a plurality of serially connected moving-averaging circuits, the filter (4) performs a process so that the signal level of the frequency spectrum of the random noise is biased toward a frequency band that deviates from the DDS setting frequency. The random noise outputted from the filter (4) is inputted to the addition unit (5).
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Inventors:
KOBAYASHI KAORU (JP)
Application Number:
PCT/JP2015/001337
Publication Date:
September 17, 2015
Filing Date:
March 11, 2015
Export Citation:
Assignee:
NIHON DEMPA KOGYO CO (JP)
International Classes:
H03B28/00
Foreign References:
| JPH04502092A | 1992-04-09 | |||
| JPH0897744A | 1996-04-12 | |||
| JP2000252750A | 2000-09-14 |
Attorney, Agent or Firm:
INOUE, TOSHIO (JP)
Toshio Inoue (JP)
Toshio Inoue (JP)
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