Title:
【発明の名称】デジタル周波数シンセサイザー
Document Type and Number:
Japanese Patent JP2776515
Kind Code:
B2
Abstract:
A four-channel multifunction digital frequency synthesizer which uses direct numerical synthesis to generate one or more complex output signals having selectable frequency, phase offset, amplitude level and waveform is provided. A waveform synthesizer digitally synthesizes precise sine (707), square (709), triangle (705), ramp (703), uniform (711) and Gaussian (713) noise and DC waveforms which can be selected for any of the four channels. One of the four channels can be frequency, phase and amplitude modulated by the signals on the remaining three channels in any combination. The four channels are time-multiplexed (85,86) which allows the use of a single frequency synthesizer (71) to realize four independent channels (861,863,865,867) and a large number of support functions and capabilities in a high-density VLSI integrated circuit on a single chip (70). The synthesizer system can provide up to four independent output (861,863,865,867) signals which can be any one of the four channel signals, or any combination of the four channel signals summed to form a complex waveform signal.
Inventors:
FURETSUDO EICHI AIBISU
ROBAATO TEII DEITSUKAASON
UIRIAMU JEI DEITSUKAASON
MAIKERU DEII MATSUKUNEMII
MAAKU DEII TARUBOTSUTO
ROBAATO TEII DEITSUKAASON
UIRIAMU JEI DEITSUKAASON
MAIKERU DEII MATSUKUNEMII
MAAKU DEII TARUBOTSUTO
Application Number:
JP21154188A
Publication Date:
July 16, 1998
Filing Date:
August 25, 1988
Export Citation:
Assignee:
HYUURETSUTO PATSUKAADO CO
International Classes:
G01R27/28; G01R31/316; G01R31/3183; G06F1/02; G06F1/03; G06F7/544; H03B28/00; H03K4/06; H03K4/48; H03L7/06; (IPC1-7): H03B28/00; G06F1/02
Domestic Patent References:
| JP5764294A | ||||
| JP5525223A | ||||
| JP5685960A | ||||
| JP61124994A | ||||
| JP5881364A |
Other References:
【文献】米国特許4134072(US,A)
Attorney, Agent or Firm:
Hideo Ueno