| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 101 === This paper uses a TSMC 0.18μm CMOS process to design receiver front end for 802.11ac systems. Two manufactures were commissioned to create the electric circuits 5.8~10.6GHz ultra low voltage low power UWB LNA and a 2.4GHz high coupling factor transformer. And Only using ADS to simulation beamformer for 802.11ac receiver.
The beamformer pattern of the fundamental beam control principle is to use array antenna arrangement circuit to control the phase array antenna, the antenna arrangement structure to compensate for the distance difference caused by such a constructive interference or destructive wave interference. And then connects with the last phase shifter, power control beam pattern basic principle is to use the array antenna control circuit arranged to control the structure and through a phase array antenna, the antenna array structure to compensate for the distance difference caused by such a constructive wave interference or destructive interference. Then connect the phase shifter in combination with low-noise amplifier with a high amount of coupling transformer to achieve the " Using RFIC to implement a beamformer for 802.11ac Receiver."
The advantages of phased array receiver (1) improve the signal to noise ratio (2) cancel the noise. Through circuit simulation, adjusting the phase shifter is connected to the terminal of ∅_1、∅_2、∅_3、∅_4, can obtained east, south, west, north, northeast, southeast, northwest, southwest, eight kinds of beamformer pattern diagram thus making the wave constructive interference or destructive interference.
The 802.11ac receiver contains a low noise amplifier application for 802.11ac systems, T-Junction, 90° phase shifter, switches and power combine transformer. T-Junction main function is the signal one dividing into two to facilitate connect with the phase shifters. The 90° phase shifter derived from use leading 45° and lagging 45° two parallel phase shifter. Switch using the enhanced series-parallel and the configuration of the transistor group in the gate terminal providing a control bias voltage V and V ̅bias of opposite polarity, so that the switch can be present at the output terminal of the switching state, and finally improved "high coupling factor transformer "is used to combine power transformer.
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