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Phase accumulator for preset value pipeline structure

A technology of phase accumulator and preset value, which is applied in the direction of electric components and automatic power control, etc. It can solve the problems affecting the maximum frequency hopping rate of frequency hopping communication, increase the frequency switching time of direct digital frequency synthesizer, etc., and achieve high speed , The effect of reducing power consumption

Inactive Publication Date: 2010-04-14
TSINGHUA UNIV
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Problems solved by technology

The delay of the output phase will increase the frequency switching time of the direct digital frequency synthesizer and affect the highest frequency hopping rate of the frequency hopping communication

Method used

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  • Phase accumulator for preset value pipeline structure
  • Phase accumulator for preset value pipeline structure
  • Phase accumulator for preset value pipeline structure

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings.

[0013] A kind of embodiment structure of preset value pipeline structure phase accumulator of the present invention is as follows figure 2 As shown, it includes three preset value phase accumulators 230, 232, 234, a first-stage N0 bit accumulator 250 and a D flip-flop of K+N0+3 bit length (K bit D flip-flop unit KDFF s ). In the figure, the M-bit frequency control word 220 is connected to the phase accumulation input terminal, divided into four bits of length N0, N1, N2 and N3, and connected to the first-stage accumulator 250 and the second-stage preset value accumulator 234 respectively , the input end of the third stage preset value accumulator 232 and the fourth stage preset value accumulator 230; the frequency control word change control signal 222 is connected to the control signal input ends of the three preset value accumulators, and the second stage preset T...

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Abstract

This invention relates to pre-set value streamline structure phase sum device in the said technique field, which comprises N-1 pieces of pre-set value phase sum device, N-1 pieces of D triggers, one NO bit sum device and one K bit of D trigger unit, wherein, the first degree sum device and the N-1 sum device input end and M bit frequency control N circuit input digital signal one branch are connected; other end of the signal device input end is connected to the frequency control input digital signals; the N-1 pre-set value sum device is connected to control signal end; the N-1 D triggers are connected to two adjacent sum bit input end and output end; the K bit D trigger input end is connected to the output end of the sum device.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit phase accumulator design, in particular to a design of a low-power high-speed phase accumulator applied to a direct digital frequency synthesizer for frequency hopping communication. Background technique [0002] The sine (cosine) signal generated by the direct digital frequency synthesizer has the advantages of fast frequency hopping, sub-Hz frequency resolution, high bandwidth, frequency switching phase continuity and low phase noise. These advantages make direct digital frequency synthesizers very suitable for frequency hopping communication systems. In practical applications, in order to improve the frequency resolution of the direct digital frequency synthesizer, a phase accumulator with a bit width of more than 32 bits is usually required. At the same time, increasing the output frequency range of the system requires the phase accumulator to work at a higher clock speed. Because...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/197H03L7/08
Inventor 陈军杨华中罗嵘
Owner TSINGHUA UNIV
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