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| 型号： | IPR-NCO |
| 厂商： | Altera |
| 文件页数： | 35/54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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Chapter 4: Functional Description
Functional Description
Functional Description
Figure 4–1 shows a block diagram of a generic NCO.
Figure 4–1. NCO Block Diagram
4–3
Req u ired
Optional
Freq u ency
Dither
Generator
Phase
Mod u lation
Inp u t
? FM
Internal
Dither
? DITH
Mod u lation
Inp u t
? PM
Phase
Increment
? I N C
W aveform
Generation
Unit
sine
cosine
D
Phase Acc u m u lator
The NCO MegaCore function allows you to generate a variety of NCO architectures.
You can create your custom NCO using an IP Toolbench-driven interface that includes
both time- and frequency-domain analysis tools. The custom NCO outputs a
sinusoidal waveform in two’s complement representation.
The waveform for the generated sine wave is defined by the following equation:
s ? nT ? = A sin 2 ? ? ? f O + f FM ? nT + ? PM + ? DITH ?
where:
( P width ) used for this value by the equation: ? PM = ---------------
? DITH is the internal dithering value
■
■
■
■
■
■
T is the operating clock period
f O is the unmodulated output frequency based on the input value ? INC
f FM is a frequency modulating parameter based on the input value ? FM
? PM is derived from the phase modulation input value P and the number of bits
P
P width
2
A is 2 N -1 where N is the magnitude precision (and N is an integer in the range
10–32)
The generated output frequency, f o for a given phase increment, ? inc is determined by
the following equation:
? inc f clk
M
f o = ------------------ Hz
2
where M is the accumulator precision and f clk is the clock frequency
The minimum possible output frequency waveform is generated for the case where
? inc = 1. This case is also the smallest observable frequency at the output of the NCO,
also known as the frequency resolutio n of the NCO, f res given in Hz by the following
equation:
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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