difflna_mix

difflna_mix - A 1.8V Fully Differential CMOS Low Noise...

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A 1.8V Fully Differential CMOS Low Noise Amplifier with a Special Care for Mixer Input Stage Jeonghoon Lee, Youngsik Kim Dept. of Information Technology, Handong Global University, Heunghae-eub, Buk-gu Pohang, Gyung-buk, Republic of Korea Abstract A fully differential low noise amplifier with a special care for mixer input stage is presented. It considers mixer input stage to comply with DC bias condition of low noise amplifier output without bias tee using a common- mode feedback circuitry (CMFB). The proposed fully differential low noise amplifier is focused on the 915MHz an unlicensed frequency ISM band communication. This low noise amplifier is fabricated on CMOS 0.18-μm technology. Measured results show 19.2dB power gain, 2.7dB noise figure (NF), -8.6dBm output P1dB and 2.2dBm OIP3. Furthermore, power gain varies from 17.3dB to 19.5dB and also output P1dB changes from -19.5dBm to -6dBm according to the reference voltage which is engaged to CMFB. This fully differential low noise amplifier consumes 1.7mA current at 1.8V supply voltage. Index Terms Low noise amplifier (LNA), Noise figure (NF), Common-mode feedback circuitry (CMFB). I. INTRODUCTION As the increasing of the wireless communication market, the design of low noise amplifier becomes important part which characterizes the whole receiver performance, especially noise figure. Thus a low noise amplifier has been improved and analyzed widely. In order to improve the noise characteristic, some kinds of feedback topologies are reported. At first, shunt resistive feedback can relieve the noise contribution to whole noise figure [1]. But used resistor is originally the major thermal noise source. Because of this reason, this topology cannot be attractive solution to achieve the very low noise performance. Usually, shunt resistive feedback low noise amplifier has been used for wideband low noise amplifier; UWB communication solution due to the huge bandwidth [2]. On the other hand, second feedback topology using source degenerated inductor for series inductive feedback has been considered the best solution to acquire good noise figure and high power gain [3].
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difflna_mix - A 1.8V Fully Differential CMOS Low Noise...

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