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A high-speed and high-precision nco circuit

A high-precision, circuit-based technology, applied in the direction of electrical components, automatic power control, etc., can solve problems such as the large area ratio of a single NCO module

Active Publication Date: 2021-12-07
58TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the DUC module of the ASIC circuit, the NCO is only one of the components. If the CORDIC algorithm is used to implement, the area of ​​a single NCO module is very large.

Method used

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  • A high-speed and high-precision nco circuit
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  • A high-speed and high-precision nco circuit

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Embodiment 1

[0041] The invention provides a high-speed and high-precision NCO circuit, the overall structure of which is as follows figure 1 As shown, it includes a phase accumulator (Phass_Acc) and several arrays of phase-to-amplitude conversion units (Phase_to_Amp). The phase accumulator generates parallel phases according to the input frequency configuration word (FTW) and phase configuration word (POW); the phase amplitude conversion unit (Phase_to_Amp) is four arrays, which convert the output phase of the phase accumulator into corresponding Amplitude value, and finally generate a sine-cosine waveform corresponding to the frequency.

[0042] Such as figure 2Shown is the structural diagram of the phase accumulator, including the phase word register (POW_REG), the frequency word register (FTW_REG), the accumulator (Acc), the accumulator output (Acc_out), and the phase calculation module (Phase_Calc); the phase word The register and the frequency word register are updated by the sam...

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Abstract

The invention discloses a high-speed and high-precision NCO circuit, which belongs to the technical field of large-scale digital integrated circuit design. The high-speed and high-precision NCO circuit includes a phase accumulator and several arrays of phase-amplitude conversion units. The phase accumulator generates parallel phases according to the input frequency configuration word and phase configuration word; the phase-amplitude conversion unit is four arrays, which convert the output phase of the phase accumulator into a corresponding amplitude value, and finally generate a positive frequency corresponding to the frequency cosine waveform.

Description

technical field [0001] The invention relates to the technical field of large-scale digital integrated circuit design, in particular to a high-speed and high-precision NCO circuit. Background technique [0002] In the signal transmission system, the baseband signal usually needs to be up-converted to an intermediate frequency band by a DUC (Digital Up Converter) module. The DUC module includes three steps: interpolation, filtering and frequency mixing. As an important component of the mixer, the performance of the NCO (Numerical Controlled Oscillator, digitally controlled oscillator) has an important influence on the output signal quality. [0003] There are usually two ways to implement NCO: ROM-based lookup table method and ROM-LESS method. The ROM-based lookup table method is to first store the phase / amplitude relationship in the form of address / value, and use the phase as the address index bit to obtain the amplitude value. In the ROM-LESS method, the phase directly cal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
CPCH03L7/0994
Inventor 邵杰任凤霞蔡国文万书芹苏小波
Owner 58TH RES INST OF CETC