Bi-directional Low Pass Filter and Mixer Design
Abstract: This report presents the research and implementation of a bidirectional filter and mixer combination for the transceiver chain in 5G TDD equipment. The main objective of this project is to find a feasible design for mixer and low pass filter to reuse the same hardware blocks for both transmitter and receiver chain. The reuse of the hardware blocks effectively reduces the area, power consumption, and routing complexity of the system. A bidirectional low pass filter incorporating transconductor based active inductors are presented in this work. This choice is due to the Gm-C-based inductor’s performance metric in the sub-gigahertz to the gigahertz frequency range. The voltage mode passive mixer is used for frequency up and down-conversion in transmit and receive cases, respectively. This choice of the mixer has reduced power consumption and integration complexity. The simulation results show that the filter frequency response has a sharp roll-off at 1.2GHz and attenuation of 40dB at 3.2GHz and a passband gain of -0.8dB and -0.7dB, respectively for transmitting and receiving case. For the transmitter chain, the measured overall voltage gain is -5.749dB, and the OIP3 is -10.7dBm. For the receiver chain, the overall voltage gain is -8.085dB, and IIP3 is 2.08dBm.
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