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| 型号： | IPR-NCO |
| 厂商： | Altera |
| 文件页数： | 39/54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
1
When you specify a dual output multiplier-based NCO, the MegaCore
4–7
function provides an option to output a sample every two clock cycles. This
required by the waveform generation unit. For more information refer to
“Implementation Tab - Multiplier-Based Algorithm” on page 3–6 .
Table 4–2 summarizes the advantages of each algorithm.
Table 4–2. Architecture Comparison
Architecture
Large ROM
Small ROM
CORDIC
Multiplier-Based
Advantages
Good for high speed and when a large quantity of internal memory is available.
Gives the highest spectral purity and uses the fewest logic elements for a given
parameterization.
Good for high output frequencies with reduced internal memory usage when a
lower SFDR is acceptable.
High performance solution when internal memory is at a premium. The serial
CORDIC architecture uses fewer resources than parallel although the throughput
is reduced.
Reduced memory usage by implementing multipliers in logic elements or
dedicated circuitry.
Frequency Modulation
In the NCO MegaCore function, you can add an optional frequency modulator to
your custom NCO variation. You can use the frequency modulator to vary the
oscillator output frequency about a center frequency set by the input phase increment.
This option is useful for applications in which the output frequency is tuned relative
to a free-running frequency, for example in all-digital phase-lock-loops.
You can also use the frequency modulation input to switch the output frequency
directly.
You can set the frequency modulation resolution input in the NCO MegaCore
function. The specified value must be less than or equal to the phase accumulator
precision.
The NCO MegaCore function also provides an option to increase the modulator
pipeline level; however, the effect of the increase on the performance of the NCO
MegaCore function varies across NCO architectures and variations.
Phase Modulation
You can use the NCO MegaCore function to add an optional phase modulator to your
MegaCore function variation, allowing dynamic phase shifting of the NCO output
waveforms. This option is particularly useful if you want an initial phase offset in the
output sinusoid.
You can also use the option to implement efficient phase shift keying (PSK)
modulators in which the input to the phase modulator varies according to a data
stream. You set the resolution and pipeline level of the phase modulator in the NCO
MegaCore function. The input resolution must be greater than or equal to the
specified angular precision.
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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