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Full digital numerically controlled oscillator

A numerically controlled oscillator, all-digital technology, applied in the direction of pulse processing, electrical components, pulse technology, etc., can solve the problem of consuming large storage resources

Active Publication Date: 2016-02-24
南京中新赛克科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that designing high-performance NCO in FPGA needs to consume a large amount of storage resources, and proposes an all-digital numerically controlled oscillator

Method used

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  • Full digital numerically controlled oscillator
  • Full digital numerically controlled oscillator
  • Full digital numerically controlled oscillator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The specific implementation of the present invention is aimed at figure 1 The last structure in the . And assume that N=22 in the structure, and the waveform amplitude word width is 18.

[0052] According to Equation 1, Na and Nb are determined.

[0053] Take the derivative of the function F in formula 1

[0054] dF dNa = d ( 2 Na + 2 ( 22 - Na - 2 ) ) dNa

[0055] = ( 2 Na - 2 20 ...

Embodiment 2

[0059] On the basis of Example 1, according to formula 3, further optimize Na and Nb;

[0060] θ A = 2 π 2 10 = 0.0061328125

[0061] sinθ A =0.0061358846491544753596402345903726

[0062] 1 2 17 sin θ A - θ A = 3.0721491544753596402345903725809 e - 6 1 2 18

[0063] 1 2 19 sin θ A - θ A 1 2 18 ...

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Abstract

A full-digital controlled oscillator comprises a totalizer, a summator, a quantization module and a lookup table module. The creation method of the lookup table module includes the steps of setting a coarse and fine two-level table structure, adopting a following formula to confirm digits of addresses of a coarse accuracy table and a fine accuracy table, and adopting the coarse accuracy table and the fine accuracy table to replace a single-piece table structure and build the lookup table module. The full-digital controlled oscillator solves the problem that a large number of storage resources are required when the traditional direct digital synthesis (DDS) (direct digital frequency synthesis) technology is adopted to design a high-performance numerically controlled oscillator (NCO), simplifies the requirements for a large number of storage resources to a small number of numerical calculations, and is applicable to a field programmable gate array (FPGA) chip which requires less storage resources and is not sensitive to the numerical value.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a method for designing and realizing an NCO (Numerical Controlled Oscillator), which is suitable for realizing in FPGA (Field Programmable Gate Array). Background technique [0002] The design technology of numerical control oscillator is the key technology and difficulty in wireless communication. It is one of the most important factors that determine the performance of the communication transceiver, and it is also relatively complicated. For the design technology and method of NCO, in the author Yang Xiaoniu's "Principles and Applications of Software Radio", p123-126 has a detailed theoretical description. However, the design methods in the literature are only theoretically feasible, or applied to occasions that do not require high performance. If the performance requirements are very high, such as frequency accuracy, orthogonality and frequency purity, this design metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/135H03K5/131
Inventor 宋奇菊
Owner 南京中新赛克科技有限责任公司