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SIC LNA for 5G and beyond

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Description

In-band full-duplex (IBFD) radio is the enabling technology for 5G systems and self-interference (SI) is the core problem behind the implementation of IBFD radios. Many researchers have proposed several techniques for self-interference cancellation (SIC). The design proposed by Stanford [1] requires an adder block preceded by the Low Noise Amplifier (LNA), which could degrade Noise-Figure (NF) and cause impedance mismatch. As the NF of the receiver chain is dominated by the first component and impedance matching is required at the input of LNA, adding an extra block could result in degraded NF and impedance matching will be required at the input of the adder. In this project, an LNA will be designed with SIC capability. The SI will be canceled within LNA at different nodes. Thus, it eliminates extra circuitry. In the end, complete design, measurement results, and project manual will be provided.

Proposed Idea

It is proposed that a wide-band LNA will be designed with SIC capabilities. This could be achieved by using the different polarities of the signal at different nodes of differential LNA. In this way, the SI signal will be subtracted from the incoming signal, comprised of the intended received signal and SI, within LNA. The block diagram of IBFD transceiver with the proposed LNA is shown below.

Schematic

The LNA is comprised of Common-Source (M1) and Cascode (M4) for high gain, current reuse device (M5) for gain with low power, and Common-Drain (M2) for partial thermal noise cancellation of M1, M4, and M5. The wideband input matching is achieved using M2. SI is modeled and applied at different nodes of LNA in such a way that it becomes opposite with respect to incoming SI. Thus SI in the received signal will be canceled by modeled SI at different nodes of LNA. The schematic of the proposed circuit of the proposed LNA is shown below.

Design Goal

Implementation of SIC capabilities within wideband LNA by exploiting its differential property for 5G. The target performance of the proposed design is summarized in the Table below.

Factors

Targeted Value

SIC

>20dB

Gain

>17dB

Bandwidth

1-7GHz

Power

<20mW

Area

<0.02mm2

NF

<4dB

IIP3

>-5dBm

Supply Voltage

1.4-1.8V

Deliverables

Complete schematic of design, GDS, measurement results, and project report.

References

[1]       D. Bharadia, E. McMilin, and S. Katti, “Full duplex radios,” SIGCOMM 2013 - Proc. ACM SIGCOMM 2013 Conf. Appl. Technol. Archit. Protoc. Comput. Commun., pp. 375–386, 2013, doi: 10.1145/2486001.2486033.

[2]       R. Ramzan, S. Andersson, and J. Dabrowski, “A 1.4 V 25 mW inductorless wideband LNA in 0.13 mm CMOS,” in IEEE International Solid-State Circuits Conference, 2007, pp. 424–425.

Team

Hamza Saleem; Rashad Ramzan(rashad.ramzan@nu.edu.pk), Hassan Saif

Integrated Circuit Design Lab, NUCES (FAST-NU), ISB Campus, Islamabad-44000, Pakistan.

National University of Computer and Emerging Sciences (FAST-NUCES) introduced the first specialized MS Integrated Circuit (IC) design program in Pakistan in Spring 2020. We need your assistance to promote the IC design in Pakistan.  
 
The applied project is the MS thesis and we would like to tapeout the proposed circuit and them measure and publish and share the design in open source.  Your assistance in tapeout will be of real help. 
To know more about this nascent MS IC Design program please have a look at the link below. 

   

Owner

Hamza Saleem

Organization URL

http://isb.nu.edu.pk/rfcs2/

Summary

Self-Interference cancellation is the core problem in In-band Full-duplex radios in 5G. This new LNA will cancel Self-Interference at different nodes in it.

Tags

5G

IBFD

LNA

NR

SIC