A 24-mW Two-Stage Feedforward Self-Interference Cancellation Receiver With Automatic Gain Control Loop
Journal
IEEE Transactions on Microwave Theory and Techniques
Start Page
1
End Page
12
ISSN
0018-9480
1557-9670
Date Issued
2025-12-05
Author(s)
Abstract
This article presents a low-power two-stage feedforward self-interference cancellation (SIC) receiver designed for frequency-division duplex (FDD) applications. By relocating the feedforward SIC path to the second stage, the additional noise contributed from the SIC path can be reduced by the first-stage amplifier. Moreover, an automatic gain control (AGC) loop continuously monitors the amplitude difference between the two paths and adjusts the programmable-gain amplifier (PGA) gain until the residual interference is minimized. Measurement results show a maximum conversion gain (CG) of 46 dB and a minimum noise figure (NF) of 4 dB across the 6.4–7.1-GHz band. The SIC technique achieves up to 32-dB interference suppression while maintaining receiver performance under TX interference up to −20 dBm. The prototype consumes 24.1 mW and occupies 2.58×1.35 mm2. The proposed receiver demonstrates competitive power efficiency, SIC performance, and robustness for emerging FDD wireless applications.
Subjects
Automatic gain control (AGC)
feedforward technique
frequency-division duplex (FDD)
power-efficient
self-interference cancellation (SIC)
transformer feedback
two-stage
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Type
journal article