直接数字式频率合成器DDS(Direct Digital Synthesizer),实际上是一种分频器:通过编程频率控制字来分频系统时钟(SYSTEM CLOCK)以产生所需要的频率。 DDS 有两个突出的特点,一方面,DDS工作在数字域,一旦更新频率控制字,输出的频率就相应改变,其跳频速率高;另一方面,由于频率控制字的宽度宽(48bit 或 者更高),频率分辨...
直接数字式频率器DDS（Direct Digital Synthesizer），实际上是⼀种分频器：通过编程频率控制字来分频系统（SYSM CLOCK）以产⽣所需要的频率。DDS 有两个突出的特点，⼀⽅⾯，DDS⼯作在数字域，⼀旦更新频率控制字，输出的频率就相应改变，其跳频速率⾼；另⼀⽅⾯，由于频率控制字的宽度宽（48bit ...
采用直接数字合成(Direct Digital Synthesizer)方案。DDS 的原理框图如图1-1所示。xiaotai-2666.blog.163.com|基于35个网页 2. 直接数字频率合成器 详细说明:直接数字频率合成器(Direct Digital synthesizer)是从相位概念出发直接合成所需波形的一种频率合成技术。一个 …www.pudn.com|基于34个网页 3. 直接数字合成...
5.1.5 Direct digital synthesis Direct digital synthesis is a method for radio frequency wave generation that allows precise digital control over frequency, phase and amplitude is. A direct digital synthesizer (DDS) generates waveforms digitally instead of being based on an analog oscillator as in the...
Implementation of digital signal processing techniques relies on computing platforms such as very large-scale integrated circuits that increasingly benefit from Moore’s law: the number of transistors in a dense integrated circuit (IC) doubled about every two years. This lead to gradual cost and per...
Why would one use a direct digital synthesizer (DDS)? Aren’t there other methods for easily generating frequencies? The ability to accurately produce and control waveforms of various frequencies and profiles has become a key requirement common to a number of industries. Whether providing agile sour...
Direct digital synthesizerPURPOSE: To generate higher-frequency analog waveform data than the conventional device without being limited by a reference clock.井手 輝二
A direct digital synthesizer (DDS) for generating a waveform output according to a frequency input and a clock signal is provided. The direct digital synthesizer includes: a code generator for generating a digital code in response to the frequency input and the clock signal, a digital-analog con...
The overall circuit performances are very interesting. The synthesizer/mixer IC, realized in a 0.25 mum CMOS technology, has an area occupation of 0.22 mm2 and dissipates 152 mW at 380 MHz with a supply voltage of 2.5 V 展开 关键词: CMOS digital integrated circuits digital arithmetic direct ...
In this chapter the operation of the direct digital synthesizer is first described. It is simple to add modulation capabilities to the DDS, because the DDS is a digital signal processing device. It is shown that the DDS produces spurs as well as the desired output frequency.This...