A 6th-Order Quadrature CTDSM using Double-OTA and Quadrature NSSAR with 171.3dB FoMs in 14nm We introduce an extra CC path (shaded blocks in Fig. 9.6.3) to the integrator within NSSAR to achieve even higher SNR. This transforms the NTF of the NSSAR to the desired band, resulting in further suppressed quantization noise in the target bandwidth. Figure 9.6.3 shows the effectiveness of our QNSSAR with the simulated quantization noise using three different quantizers in a quadrature CT-DSM with ideal models. The resulting SQNR utilizing QNSSAR is 93.52dB while the conventional SAR, and NSSAR give 76.35dB, and 88.36dB, respectively.

📋 论文概要

该论文提出了一种基于双OTA和正交NSSAR的6阶正交连续时间Delta-Sigma调制器（CTDSM），用于低中频无线接收机（如BLE和IoT），具有高能效和抗混叠特性。通过优化NTF和采用新型架构，实现了171.3dB的FoMs，在14nm工艺下显著提升了性能。

💡 主要创新点

• 提出6阶正交CTDSM架构，结合双OTA实现高阶噪声整形和低功耗。
• 采用正交NSSAR（噪声整形逐次逼近寄存器）量化器，提升量化效率。
• 巧妙设计NTF优化，在低中频应用中实现171.3dB的高FoMs。

🏷 关键词

📄 原文摘要

low-intermediatefrequency (low-IF) architecture is widely chosen for energy efficient wireless communication systems, such as Bluetooth Low Energy (BLE) and IoT. The low-IF architecture typically requires filters for anti-aliasing and image rejection to suppress aliasing from the adjacent channels. The use of the continuous-time delta-sigma modulator (CTDSM) ADC makes the low-IF receivers more efficient with its inherent antialiasing property. In addition, by shifting the noise transfer function (NTF) we can optimize the order and sampling speed of the CTDSM ADC to minimize the in-band quantization noise [1]. We present a sixth-order CTDSM that maximizes power efficiency by implementing the integrator using a single-amplifier quadrature biquad (SAQB) filter and low-IF shifted NTF-based quadrature-noise shaping SAR (QNSSAR) using dynamic

👥 作者与机构

Jongmi Lee, Seong-Eun Cho, Jaehoon Lee, Yong Lim, Seunghyun Oh,

Jongwoo Lee, Sung-Ung Kwak Samsung Electronics, Hwasung, Korea In order to mitigate 1/f noise and DC offset with less area overhead, the