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A direct conversion WiMAX RF transmitter in 0.18um CMOS technology

机译:采用0.18um CMOS技术的直接转换WiMAX RF发射机

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This paper describes a direct conversion transmitter for front-end Mobile WiMAX. The transmitter is implemented in 0.18µm CMOS technology and covers the frequency range 2.5–2.7 GHz. The components included in the system are Phase locked loop (PLL), phase frequency detector (PFD), Charge Pump (CP), TSPC based clock divider and Voltage Controlled Oscillator (VCO). On chip CMOS Class-AB Power Amplifier (PA) with adaptive biasing and highly linear active Mixer are also implemented. The transmitter employs fully differential architecture for VCO providing excellent rejection of substrate Noise. The PA has OIP3 in excess of 18 dBm providing EVM < 3% with 16 QAM modulation scheme and an excellent spectral mask adherence.
机译:本文介绍了用于前端移动WiMAX的直接转换发送器。该发射器采用0.18µm CMOS技术实现,覆盖2.5-2.7 GHz的频率范围。系统中包括的组件有锁相环(PLL),相频检测器(PFD),电荷泵(CP),基于TSPC的时钟分频器和压控振荡器(VCO)。还实现了带有自适应偏置和高度线性有源混频器的片上CMOS AB类功率放大器(PA)。该发射器采用全差分架构的VCO,可出色地抑制基板噪声。该PA的OIP3超过18 dBm,具有16 QAM调制方案的EVM <3%,并具有出色的频谱模板附着性。

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