← 返回 JSSC 论文列表JSSC 2011第11期RF & Wireless0.18μm CMOSDelta-Sigma ADC
A Quadrature Bandpass Continuous-Time Delta-Sigma Modulator for a Tri-Mode GSM-EDGE/UMTS/DVB-T Receiver Chen-Y en Ho, Student Member , IEEE, Wei-Shan Chan , Student Member , IEEE, Y ung-Y u Lin
一款采用功率缩放技术和正交失配消除器的三模GSM-EDGE/UMTS/DVB-T低中频接收机正交带通连续时间ΔΣ调制器
81/61.2/60.9 dB SNDR, 270kHz/5MHz/8MHz带宽, 4.9/8.9/12.1 mW功耗
正交带通连续时间ΔΣ调制器多比特DAC功率缩放三模接收机
▸创新点1：功率缩放技术(PST)是一种电路创新，通过动态调整运算放大器的功耗，优化了三模式(GSM-EDGE/UMTS/DVB-T)操作中的功耗效率，显著降低了整体功耗，具体表现为4.9/8.9/12.1 mW的功耗。
▸创新点2：正交失配消除器(QMS)是一种方法创新，有效缓解了I/Q多比特DAC之间的失配问题，提升了系统的图像抑制比，测量结果显示所有模式的图像抑制比均优于55 dB。
▸创新点3：多比特DAC失配消除是一种系统创新，通过引入QMS技术，解决了多比特DAC在宽带应用中的失配问题，提升了调制器的整体性能，SNDR分别达到81/61.2/60.9 dB。
▸创新点4：该调制器采用二阶多比特正交带通连续时间Delta-Sigma结构，是一种电路创新，支持500 kHz至12 MHz的可编程带通中心频率，适应多种通信标准的需求。
Abstract
A second-order multi-bit quadra ture bandpass con- tinuous-time delta-sigma mod ulator (QBP-CTDSM) employing a power-scaling technique (PST) and a quadrature mismatch scrambler (QMS) for a tri-mode GSM-EDGE/ UMTS/DVB-T low-IF receiver is reported in this paper. This modulator employs operational ampli fiers with PST to optimize power consumption among the tri-mode operation. In addit ion, the modulator incor- porates the proposed QMS to mitigate the mismatch between the I/Q multi-bit DACs. Fabricated in a 0.18- mC M O Sp r o c e ss, the proposed QBP-CTDSM achieves 81/61.2/60.9 dB SNDR across 270- kHz/5-MHz/8-MHz bandwidth. The bandpass center frequency is programmable from 500 kHz to 1 2M H z .M e a s u r e df r o ma 1.8-V supply voltage, the modulator power consumptions are 4.9/8.9/12.1 mW for the GSM-EDGE/UMTS/DVB-T modes, respectively, which resul t in FOMs of 0.99/0.95/0.84 pJ/conver- sion. The measurement results also show that the QBP-CTDSM achieves image rejection ratios better than 55 dB for all modes.