Questions tagged [dds]

A direct digital synthesizer (DDS) creates waveforms from a single frequency reference clock. Typically the reference frequency is fed into a numerically controlled oscillator (NCO) that controls the final frequency and waveform type from where the quantized digital data is converted to analog using a digital to analog converter (DAC).

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DDS reconstruction filter after amplifier?

I need a clean sine wave from 10 kHz to 2 MHz as an excitation source for an eddy current probe. The sine wave will be generated by an AD9833 DDS with a clock frequency of 25 MHz. As a reconstruction ...
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DDS NBFM transmitter design

As a design exercise I'm trying to come up with a design for NBFM. I'd like to stick with digital domain as much as possible, since that's what I know best. I'm familiar with RF enough to know that I ...
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How does stretch processing work for SFCW?

I've been reading about FMCW radar, and I understand that a chirped signal can be de-chirped by mixing it with a copy of itself, which yields a beat frequency which is much easier to process and is ...
user201537's user avatar
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Ripple on tens-millivolts sinus waveform

I’m trying to make a DDS to generate a sinusoidal signal with tens to hundreds of millivolt amplitude and hundreds kHz frequency using an LTC1666 DAC. But I have some confusing results. Device ...
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Frequency response of linear DDS chirp

I am performing a linear frequency sweep from 80 MHz to 120 MHz in 26.84 ms with the AD9910 direct digital synthesiser. I experience that the output amplitude is not constant (see Figure 1). With my ...
bodokaiser's user avatar
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How to avoid distortion (quantization error) in DDS output in STM32?

I have been using a timer interrupt to generate sine waves with an STM32, however, for higher phase increments (to get higher frequencies as output), there are quantization errors (distortions). To ...
Rima's user avatar
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UTG900E output specification

The datasheet of UTG900E Waveform generator says it can output up to 10 Vpp on a 50 ohm load, but in chapter 3.3.1 is stated the load can be set between 1 and 999 ohm. Nowhere in the datasheet I see ...
Mark's user avatar
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How to increase SFDR value for Direct digital synthesizer simulation?

I am following the code written in this article code and I am manipulating some numbers based on my application. I want to use a stm32 microcontroller to generate a sine waveform. I didn't understand ...
Rima's user avatar
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Amplify 1kHz sine wave from AD9833 DDS using LMH6609 operational amplifier

I'm trying to amplify a 1kHz sine wave signal from the AD9833 DDS chip (0.6Vp-p) to a more usable level (6Vp-p) for a sort of function generator. I plan to work with higher frequencies as well. So I ...
Harid444's user avatar
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How to find the RMS value of a sine wave with DC offset and retain the negative sign

I'm trying to build a Quadrature setup where an input signal is mixed with a reference signal that is in-phase and another one out-of-phase by 90deg. The idea is to extract the real and imaginary ...
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K50-HC0CSE25.0000MR Clock signal not being driven to correct logic levels

I am using a K50-HC0CSE25.0000MR to generate a 25MHz clock for the DDS IC AD9833. I have hooked up the clock output directly to the MCLK input of AD9833 as shown in the diagram.. The data sheet ...
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How to generate correct frequency in DDS using stm32?

I had asked a question a week ago regarding DDS on STM32 and I got some good answers. Based on that I tried to write a code to implement DDS on stm32. In my project I need to generate a 10 KHz sine ...
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