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由于采用正交频分复用(OFDM)技术,802.11 a/g无线局域网接收机的模拟基带电路需要克服12 dB峰均功率比(PAPR).本文设计了一种基于实时压扩方式的模拟基带电路,主要包括5阶开关电容低通滤波器和10-bit流水线模数转换器.滤波器的截止和时钟频率分别为10 MHz和100 MHz,模数转换器的采样时钟为25 MS/s.经滤波器压缩的信号直接经过模数转换器,同时信号扩展在后端数字域完成,无需采用模拟放大器恢复信息.因为动态范围扩了2 bit,基于压扩方式的模拟基带功耗大约为传统基带的四分之一.本设计采用1.2 VIBM CMOS工艺实现,设计功耗为75mW.
Due to Orthogonal Frequency Division Multiplexing (OFDM) technology, the analog baseband circuit of 802.11 a / g wireless LAN receiver needs to overcome PAPR of 12 dB.This paper designs a real-time spread spectrum based analog baseband The circuit consists of a 5-stage switched capacitor low-pass filter and a 10-bit pipelined analog-to-digital converter with filter cutoff and clock rates of 10 MHz and 100 MHz, respectively, and an A / D converter sampling clock of 25 MS / s. The filter-compressed signal goes directly to the analog-to-digital converter and the signal spread is done in the back-end digital domain, eliminating the need for an analog amplifier to recover the information. Because the dynamic range is expanded by 2 bits, analog base band power consumption based on companding is about the traditional One-quarter of the baseband This design uses 1.2 VIBM CMOS technology to achieve the design power consumption of 75mW.