Double channel synchronous DDS device capable of modulating phase and amplitude

A dual-channel, channel technology, applied in the direction of digital function generators, etc., can solve the problems of inability to realize the adjustment and synchronization of phase difference and amplitude ratio

Inactive Publication Date: 2009-01-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The existing DDS device is a path composed of the above four parts, which c...

Method used

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  • Double channel synchronous DDS device capable of modulating phase and amplitude
  • Double channel synchronous DDS device capable of modulating phase and amplitude
  • Double channel synchronous DDS device capable of modulating phase and amplitude

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example

[0057] Example: When the clock signal is 60MHz, the number of frequency control words is 32, the number of phase control words is 14, and the number of amplitude control words is 10, the frequency is 10MHz, the phase difference is 90°, and the amplitude ratio is 5: 8 dual-channel synchronous frequency signals.

[0058] 1. Frequency control word

[0059] Depend on:

[0060] f = ( FTW ) × fs 2 N where 0≤FTW≤2 N-1

[0061] have to:

[0062] FTW = f × 2 N fs = 10 × 2 32 60

[0063] Then the frequency control word FTW is 00...

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Abstract

The present invention discloses a dual-channel phase and amplitude modulation synchronous DDS device, which comprises two channels on the basis of the prior art, wherein, an adder is added between a phase accumulator and a sinusoidal look-up table unit in the sine wave output channel of the first channel, to add the phase value from the phase accumulator with the phase control word of the first channel and output a shifted phase value, so as to shift the phase of the output waveform. In addition, a divider is added between the sinusoidal look-up table unit and a D/A converter in the sine wave output channel of the first channel, to divide the amplitude from the sinusoidal look-up table unit of the first channel by the amplitude ratio coefficient of the divider of the first channel, so as to accomplish amplitude modulation for the output waveform. In that way, phase difference and amplitude ratio functions are implemented, in relation to the second channel. The output from the phase accumulator is connected to both channel, and the synchronization control for the phase accumulator and the two channels is implemented by means of the same system clock signal; therefore, the two channels of signals are completely synchronous.

Description

technical field [0001] The present invention relates to the field of direct digital synthesis (abbreviated as DDS) synthesis, and specifically relates to a dual-channel synchronous DDS device with adjustable phase and amplitude modulation. Background technique [0002] In March 1971, American scholars J.Tierncy, C.M.Rader and B.Gold proposed the direct digital frequency synthesis technology for the first time. This is a new all-digital frequency synthesis technology that directly synthesizes the required waveform from the concept of phase. Compared with traditional frequency synthesis technology, DDS technology has extremely high frequency resolution, extremely fast frequency conversion speed, continuous frequency conversion phase, low phase noise, easy function expansion and full digitalization for easy integration, and easy realization of various output signals. Modulation and other advantages meet many requirements of modern electronic systems, so it has been developed r...

Claims

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Application Information

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IPC IPC(8): G06F1/03
Inventor 李焱骏师奕兵王志刚张伟黄河
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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