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| 型号： | IPR-NCO |
| 厂商： | Altera |
| 文件页数： | 49/54页 |
| 文件大小： | 0K |
| 描述： | IP NCO COMPILER RENEW |
| 标准包装： | 1 |
| 系列： | * |
| 类型： | MegaCore |
| 功能： | 数控振荡器编译器 |
| 许可证： | 续用许可证 |
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Appendix A: Example Multichannel Design
Multichannel Design
Parameter Settings
To meet the specification, the design uses the following parameter settings:
A–3
■
■
■
Multiplier-based algorithm —By using the dedicated multiplier circuitry in Stratix
devices, the NCO architectures that implement this algorithm can provide very
high performance.
Clock rate of 200 MHz and 32-bit phase accumulator precision— These settings yield a
frequency resolution of 47 mHz.
Angular and magnitude precision —These settings are critical to meet the SFDR
requirement, while minimizing the required device resources. Setting the angular
precision to 17 bits and the magnitude precision to 18 bits results in the spectrum
shown in Figure A–3 .
Figure A–3. Spectrum After Setting Angular and Magnitude Precision
■
Dither level —The specified angular and magnitude precision settings yield an
SFDR of approximately 100.05 dB, which is clearly not sufficient to meet the
specification. Using the dither control in the NCO MegaCore function, the
variance of the dithering sequence is increased until the trade-off point between
spur reduction and noise level augmentation is reached for these particular clock
frequency to output frequency ratio and precision settings. At a dithering level of
3, the SFDR is approximately 110.22 dB, which exceeds the specification as shown
in Figure A–4 .
Figure A–4. Spectrum After the Addition of Dithering
November 2013
Altera Corporation
NCO MegaCore Function
User Guide
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IPR-NIOS | 功能描述:开发软件 Nios II MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
| IPROBER 520 | 制造商:TTi-Thurlby Thandar Instruments 功能描述:Bulk 制造商:Aim & Thurlby Thandar Instruments 功能描述:PROBE, CURRENT, POSITIONAL, ON PCB TRACK 制造商:Aim & Thurlby Thandar Instruments 功能描述:PROBE, CURRENT, 5MHZ, 2M; Test Probe Ratio:-; Connector Type A:-; Connector Type B:-; Lead Length:2m; Bandwidth:5MHz; SVHC:No SVHC (19-Dec-2012) ;RoHS Compliant: NA |
| IPR-PCI/MT32 | 功能描述:开发软件 PCI 32b MasterTarget MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
| IPR-PCI/MT64 | 功能描述:开发软件 PCI 64b MasterTarget MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
| IPR-PCI/T32 | 功能描述:开发软件 PCI 32-bit Target MegaCore RENEWAL RoHS:否 制造商:Atollic Inc. 产品:Compilers/Debuggers 用于:ARM7, ARM9, Cortex-A, Cortex-M, Cortex-R Processors |
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