用于蓝牙接收机基带处理的高精度ΣΔ调制器  

High resolution ΣΔ modulator for bluetooth baseband channel application

作　　者：邹睿[1] 洪志良[1] 

机构地区：[1]复旦大学微电子学系专用集成电路与系统国家重点实验室,上海200433

出　　处：《系统工程与电子技术》2005年第11期1966-1970,共5页Systems Engineering and Electronics

摘　　要：设计了一种适用于蓝牙接收机基带频道选择的高精度ΣΔ调制器。根据功耗、稳定性以及电路实现等方面综合考虑,调制器采用了两级四阶2-2结构,采样时钟为32 MHz,过采样比为32。分析了实际电路的各项非理想因素对ΣΔ调制器性能的影响,采用栅压自举的采样开关、CMOS两级OTA组成的全差分开关电容电路实现。调制器电路基于0.35μm CMOS工艺实现,电源电压3.3 V、D/A参考电平±0.8 V。在1 MHz的Nyquist转换速率下SNR为86 dB,SNDR达到81 dB。A high performance cascaded sigma-delta modulator applied in selecting baseband channel of bluetooth receiver is presented. According to power dissipation, stability and circuit implementation, the modulator has a twostage four-order 2 - 2 topology and is implemented with fully differential switch-capacitor circuits consisting of bootstrapped sampling switch and two-stage OTA. The modulator, operated under single 3.3 V power supply, ±0.8 V reference voltage, oversampling clocks of 32 MHz, achieves SNR of 86 dB, and SNDR of 81 dB with an oversampling ratio of 32.

关 键 词：蓝牙接收机 基带处理 ∑△调制器 高精度 

分 类 号：TP432[自动化与计算机技术]