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首页> 外文期刊>IEEE Journal of Solid-State Circuits >Design of low-power ROM-less direct digital frequency synthesizer using nonlinear digital-to-analog converter
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Design of low-power ROM-less direct digital frequency synthesizer using nonlinear digital-to-analog converter

机译:利用非线性数模转换器设计低功耗,无ROM的直接数字频率合成器

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摘要

A design technique that uses nonlinear digital-to-analog converter (DAC) for implementing low-power direct digital frequency synthesizer (DDFS) is proposed. The nonlinear DAC is used in place of the ROM look up table for phase-to-sine amplitude conversion and the linear DAC in a conventional DDFS. Since the proposed design technique for DDFS does not require a ROM, significant saving in power dissipation results. The design procedure for implementing the nonlinear DAC is presented. To demonstrate the proposed technique, two quadrature DDFSs, one using nonlinear resistor string DACs and the other using nonlinear current-mode DACs, were implemented. For a 3.3-V supply, the resulting power dissipation for both DDFSs are 4 and 92 mW at a clock rate of 25 MHz and 230 MHz, respectively. For both DDFSs, the spurious free dynamic ranges are over 55 dB for low synthesized frequencies.
机译:提出了一种使用非线性数模转换器(DAC)来实现低功耗直接数字频率合成器(DDFS)的设计技术。在传统的DDFS中,非线性DAC代替了ROM查找表进行相到正弦的幅度转换以及线性DAC。由于为DDFS提出的设计技术不需要ROM,因此可显着节省功耗。介绍了实现非线性DAC的设计过程。为了演示所提出的技术,实现了两个正交DDFS,一个使用非线性电阻串DAC,另一个使用非线性电流模式DAC。对于3.3V电源,两个DDFS在25 MHz和230 MHz的时钟速率下所产生的功耗分别为4 mW和92 mW。对于两种DDFS,低合成频率的无杂散动态范围都超过55 dB。

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