Bi-Directional Time Domain Duplexing (TDD) Amplifier for 5G Applications

EasyChair Preprint no. 10882

Abstract

In Time Division Duplex Systems (TDD) the transmitter and receiver are not ON simultaneously. This is done to avoid the saturation of the receiver’s LNA from the high power that can get leaked into the receiver due to limited isolation. Since, either the PA or the LNA is working at a given instant of time, the area and power can be saved by designing a circuit that can work as LNA or PA at different instances in time. Low power and reduced Si area leads to reliability and cost reduction. This work presents the design of a bi-directional amplifier (BDA) in sub 5GHz range. The design contains a two-stage inductor-less LNA along with transistor-based switches and 50Ω drivers for off-chip testing. The design is implemented in Skywater 130nm CMOS open-source PDK. The results show 29.44dB voltage gain in reception mode (without buffer), less than 3.5dB noise figure in 1-4.5GHz band with input matching of -10dB. The 1-dB compression point in the transmission mode is 19dBm with a power consumption of 58mW. The active chip area of the design is 204x166μm2

Keyphrases: 130nm CMOS, 5G LNA, Bi-Directional Amplifier, CMOS LNA, LNA, wideband LNA

@Booklet{EasyChair:10882,
  author = {Shahid Jamil and Muhammad Usman and Jawad Shakil and Jafar Hussain and Rashad Ramzan},
  title = {Bi-Directional Time Domain Duplexing (TDD) Amplifier for 5G Applications},
  howpublished = {EasyChair Preprint no. 10882},

  year = {EasyChair, 2023}}