Bi-directional Low Pass Filter and Mixer Design
(2020) EITM02 20201Department of Electrical and Information Technology
- 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... (More)
- 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. (Less)
- Popular Abstract
- The internet has become an essential part of life and the number of internet users increases rapidly; and the internet is no more just used to search for information as it was in the past. The emerging technology trends have paved the way for use of the internet in various applications like the Internet of Things (IOT’s) automated vehicles, smart wearables to keep track of daily activities; thes applications are made possible with high-speed data connectivity and smaller devices for better mobility. The evolution of wireless standards to 5G (fifth generation) provides high-speed data connectivity. At the same time, there is a goal to reduce the overall power consumption of the base stations. This can be achieved partly by moving from a... (More)
- The internet has become an essential part of life and the number of internet users increases rapidly; and the internet is no more just used to search for information as it was in the past. The emerging technology trends have paved the way for use of the internet in various applications like the Internet of Things (IOT’s) automated vehicles, smart wearables to keep track of daily activities; thes applications are made possible with high-speed data connectivity and smaller devices for better mobility. The evolution of wireless standards to 5G (fifth generation) provides high-speed data connectivity. At the same time, there is a goal to reduce the overall power consumption of the base stations. This can be achieved partly by moving from a discreet component to IC (integrated circuits) designs and partly by using transceiver low power topologies. This work presents one such topology which makes the transceiver bidirectional, thus reducing its size and power consumption. In a conventional transceiver chain, separate blocks for transmitting and receiving a signal are used this is because of Frequency Division Duplexing (FDD) of operation and strict RF specifications in previous generations of wireless standards, but in 5G (fifth-generation) the mode of operation is Time Division Duplexing (TDD) and have relaxed radio frequency (RF) specifications. Hence there is a possibility of using the same hardware blocks for transmitter (Tx) and receiver (Rx) mode of operation. Thus, the chip areas can be significantly reduced. Since the number of blocks is also reduced the overall power consumption in a transceiver chain is reduced as well. The main building blocks in a transceiver chain are a filter that is used for removing undesired signals, a mixer which is used to perform frequency translation, a Low Noise Amplifier (LNA) to amplify a received signal, and a Power Amplifier (PA) to amplify a transmitting signal. The filter and mixer blocks are used both in the transmitting and receiving chain whereas LNA is used in the receiver and PA used in the transmitter blocks. The proposed design idea is to make the filter bidirectional hence we can use a single filter that provides necessary filtering in both Tx and Rx case, this is done by selecting a bidirectional architecture for filter design. The mixer block is designed using a diode ring topology which is bidirectional by design. The future work is aimed to make LNA and PA bidirectional by integrating both their functionality in a single circuit block. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9032055
- author
- Thandava Murthy, Sharath LU and Paul Pear Pradeep Kumar, Meshach Milon
- supervisor
- organization
- course
- EITM02 20201
- year
- 2020
- type
- H2 - Master's Degree (Two Years)
- subject
- report number
- LU/LTH-EIT 2020-799
- language
- English
- id
- 9032055
- date added to LUP
- 2020-12-18 13:13:30
- date last changed
- 2020-12-18 13:13:30
@misc{9032055,
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.}},
author = {{Thandava Murthy, Sharath and Paul Pear Pradeep Kumar, Meshach Milon}},
language = {{eng}},
note = {{Student Paper}},
title = {{Bi-directional Low Pass Filter and Mixer Design}},
year = {{2020}},
}