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实现了一个单片集成、直接转换结构的2.4GHz CMOS接收机.这个正交接收机作为低成本方案应用于802.11b无线局域网系统,所处理的数据传输率为该系统的最大速率——11Mbps.基于系统设计以及低噪声高线性度考虑,设计了低噪声放大器、直接转换混频器、增益可变放大器、低通滤波器、直流失调抵消电路及其他辅助电路.该芯片采用中芯国际0.18μm 1p6m RF CMOS工艺流片,所测的接收机性能如下:噪声系数为4.1dB,高增益设置下低噪声放大器与混频器的输入三阶交调点为-7.5dBm,整个接收机的输入三阶交调点为-14dBm,相邻信道干扰抑制能力在距中心频率30MHz处达到53dBc,输出直流失调电压小于5mV.该接收机采用1.8V电源电压,I,Q两路消耗的总电流为44mA.
A 2.4GHz CMOS receiver with a monolithic integrated, direct-conversion architecture was implemented as a low-cost solution for 802.11b wireless LAN systems with a data transfer rate of 11Mbps, the maximum rate for the system. Based on system design and low noise and high linearity, low noise amplifier, direct conversion mixer, variable gain amplifier, low pass filter, DC offset cancellation circuit and other auxiliary circuits are designed.The chip uses SMIC 0.18μm 1p6m RF CMOS process chip, the measured receiver performance is as follows: Noise Figure 4.1dB, high-gain setting of low-noise amplifier and mixer input third-order intermodulation point -7.5dBm, the entire receiver input three Intermodulation point of -14dBm, adjacent channel interference suppression ability at the center frequency of 30MHz to reach 53dBc, the output DC offset voltage is less than 5mV. The receiver uses 1.8V power supply voltage, I, Q total current consumption of 44mA .