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Quadrature direct digital frequency synthesizers using interpolation-based angle rotation

机译:使用基于插值的角度旋转的正交直接数字频率合成器

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This paper describes a quadrature direct digital frequency synthesizer (QDDFS) architecture based on a new phase-to-sine conversion technique. The proposed technique uses polynomial interpolation and rotational transformation in a fine/coarse approach, achieving high-resolution output with a wide spurious-free dynamic range (SFDR). The QDDFS with this technique requires small-sized lookup tables and a simple computational engine. The fine/coarse decomposition significantly reduces the size of required lookup tables, and the polynomial interpolation enables accurate approximation of cosine and sine values. Two prototype QDDFS ICs were fabricated in 0.35-Μm CMOS. The final prototype IC produces 16-b cosine and sine outputs with a spectral purity greater than 100-dB. It has a frequency tuning resolution of 0.03-Hz at a 150-MHz sampling rate and consumes 350-mW with a 3.0-V power supply.
机译:本文介绍了一种基于新的相位到正弦转换技术的正交直接数字频率合成器(QDDFS)架构。所提出的技术以精细/粗略方法使用多项式插值和旋转变换,从而实现了具有较宽的无杂散动态范围(SFDR)的高分辨率输出。使用此技术的QDDFS需要小型查找表和简单的计算引擎。精细/粗略分解显着减小了所需查找表的大小,并且多项式插值可精确逼近余弦和正弦值。两个原型QDDFS IC在0.35-μmCMOS中制成。最终的原型IC产生16b余弦和正弦输出,其频谱纯度大于100dB。它在150MHz的采样率下具有0.03Hz的频率调谐分辨率,在3.0V电源下的功耗为350mW。

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