A 16Bit ΔΣ Modulator Design with Suppressing Odd-order Harmonic Distortions
In a ΔΣ modulator design process, the amplifier nonlinearity problem is usually neglected. However, nonlinearity problems will seriously affect the signal to noise ratio, but rarely discussed in literatures. In this paper, we model the problem and elaborate the importance of the coefficient selected. We design a folded-cascode op-amp with source-degeneration to suppress nonlinearity. The PSD analysis of the modulator output shows that the third and fifth harmonics are both less then -100dB with the effective resolution up to 15bit.
modulator source-degeneration harmonic nonlinearity
Jia-jing Xu Yang Liu Shu-ying Zhang Ling Ding
College of Electronic Science and Engineering,Jilin University Changchun,130012,China
国际会议
长春
英文
76-78
2010-08-24（万方平台首次上网日期，不代表论文的发表时间）