Title:
直接デジタル合成方式による周波数合成器
Document Type and Number:
Japanese Patent JP4740144
Kind Code:
B2
Abstract:
A frequency synthesizer according to the direct digital synthesis method is provided. The frequency synthesizer includes a phase accumulator for the cyclical incrementation of a phase signal by a phase increment M present at the input of the phase accumulator, a memory unit with a table of sine-function values stored in its memory cells for the determination of sine-function values corresponding to phase values of the phase signal, a digital-to-analog converter for the conversion of time-discrete sine-function values into a quasi-analog sinusoidal time function and an anti-aliasing low-pass filter for smoothing the quasi-analog sinusoidal time function. The frequency synthesizer additionally contains an adder, which is connected between the memory unit and the digital-to-analog converter and which superimposes a non-periodic signal over the time-discrete sine-function values.
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Inventors:
Klage, Gunter
Application Number:
JP2006537139A
Publication Date:
August 03, 2011
Filing Date:
October 21, 2004
Export Citation:
Assignee:
Rohde & Schwarz GmbH & Co.KG
International Classes:
H03L7/00; G06F1/03; H03B28/00; H03L7/18; H03L7/185
Domestic Patent References:
| JP2000049538A | ||||
| JP4502092A | ||||
| JP9139628A | ||||
| JP6244641A | ||||
| JP6029744A | ||||
| JP8288844A | ||||
| JP5048453A | ||||
| JP5067969A | ||||
| JP7193451A |
Foreign References:
| US5014231 |
Attorney, Agent or Firm:
Akinori Sakai