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【Lanzhou University】DDS_AD9850+Deng Kaihao

Overview

Signal generator

1. Topic requirements

1. Can output 1KHz sine signal, voltage range: 0V-1V, 10mV step.

2. Can output 100Hz-1MHz sinusoidal signal, voltage range: 0V-1V, frequency step value is adjustable.

2. Description of the work

A DDS signal generation module is designed using the AD9850 chip, with AD9850 as the core and a 125MHz crystal oscillator as the clock source. At the same time, the low-pass filter reference circuit provided by the AD9850 module is used to ensure a certain filtering effect when the signal is output. It can generate sine wave, square wave and other signals. There is no obvious distortion when the signal frequency changes from 100Hz to 1MHz, and the signal output Vpp is 2V.

The actual objects and test results are as follows:

The picture below is a picture taken during the test:

1KHz test:

100KHz:

1MHz:

Design Files

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Update:2025-06-22 23:54:10

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