JSSC 2006第6期Other

Baseband and Audio Mixed-Signal Front-End IC for GSMEDGE Applications

一款支持GSM/EDGE和增强音频应用的混合信号前端CMOS芯片。

1.5/2.65V供电, 22mW待机功耗, 12.5bit ADC精度

混合信号前端GSM/EDGEGMSK调制ΔΣ ADC音频编解码器

▸基于Laurent近似的非线性GMSK调制器实现发射段突发整形

▸低功耗双模连续时间ΔΣ ADC支持ZIF和LIF模式

▸集成时钟抖动抑制的片上PLL

Abstract

A complete mixed-signal front-end CMOS chip is presented, supporting GSM/EDGE as well as enhanced audio applications. The chosen solution for the transmit section is based on Laurent’s approximation of the nonlinear GMSK modulator. This enables burst shaping in the I/Q domain thereby solving the problem of power ramping. Also, up to GPRS class 12 is supported. The receive section on the other hand consists of a low power dual mode continuous-time /6/1 ADC for I and Q, sup- porting ZIF and LIF mo