sfdr

The simulation result shows that dither can improve ADC 's SFDR significantly .

通过仿真说明了dither对改善ADC的SFDR指标的作用。

High-Speed D / A Converter Output Transconductance Model and Its Influence on SFDR

高速D/A转换器输出跨导模型及对无杂波动态范围的影响

The approximate formula for influence of output transconductance on spurious free dynamic range ( SFDR ) is obtained using Fourier series .

采用直流和交流量分离的方法，利用傅里叶级数，获得输出跨导对无杂波动态范围（SFDR）的影响的近似公式。

The problem of meta-stability has got special attention in this design , since this problem degrades the Spurious-Free Dynamic Range ( SFDR ) at high sampling frequencies .

因为在高采样率的情况下，比较器的亚稳态问题降低了模数转换器的无杂散动态范围，在本次设计中对其进行了优化。

With corresponding models how the matching errors and output resistance of current source affect the NL , SNDR and SFDR of DAC is analyzed and simulated in detail .

利用相应的高层次模型，详细分析并仿真了电流源匹配误差和电流源输出阻抗对DAC的非线性误差NL、信号噪声失调比SNDR、无杂波动态范围SFDR的影响。

A high-level model is set up based on Matlab , to simulate the relationship between output transconductance and SFDR , which turned out to be approximately linear for larger transconductance .

采用Matlab建立高层次模型进行仿真验证。结果表明，输出跨导较大时，输出跨导与SFDR呈近似线性关系。

Secondly the scheme has been demonstrated roundly . Then the power performance has been designed reasonably , and the feasibility about the phase noise , SFDR , hopping step , bandwidth , has been analyzed .

然后进行全面的方案论证，合理地设计了放大倍频链中各级功率分配指标，并针对相位噪声、杂散、频率步进、带宽等系统指标作了可行性分析。

In addition , due to the sinusoidal transfer function of the intensity modulator , the higher-order harmonics and intermodulation components are generated , which reduces the spur-free dynamic range ( SFDR ) of the APLs .

此外，由于电光调制器的传输曲线为非线性的正弦函数，所以在输出信号中会产生高阶谐波项和三阶交调分量，这将严重影响系统的无杂散动态范围。

With an input sine wave signal of 1 MHz , a spurious-free dynamic range ( SFDR ) up to 83.75 dB is achieved , which is much better than the requirement of the 12-bit D / A converter .

该D/A转换器在1MHz输入信号下，无杂散动态范围（SFDR）达到83.75dB；

After digital calibration , the ADC can reach an more than 70 dB SNR and an over 90 dB SFDR in system simulations ; under 0.1 % capacitor mismatch conditions , the digital calibration circuit can improve the SFDR more than 20 dB .

经过校正的模数转换器系统仿真达到了70dB以上的信噪比和90dB以上的无杂散动态范围；在0.1%电容失配的条件下，数字校正电路可以使无杂散动态范围提高20dB以上。