TY - GEN
T1 - Frequency-Domain-Equalization-based Full-Duplex Receiver with Passive-Frequency-Shifting N-Path Filters Achieving >53 dB SI Suppression Across 160 MHz BW
AU - Garimella, Sastry
AU - Garikapati, Sasank
AU - Nagulu, Aravind
AU - Kadota, Igor
AU - Davidson, Alfred
AU - Zussman, Gil
AU - Krishnaswamy, Harish
N1 - Funding Information:
ACKNOWLEDGMENT This work was supported by DARPA WARP.
Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - Wideband full-duplex (FD) transceivers pose a significant challenge as they require >100dB of self-interference cancellation (SIC) over large bandwidths. This work utilizes (i) a near-zero-power rotary clock-path passive frequency shifting technique for N-path filters while requiring only a single common LO signal across all filters, and (ii) a closed-loop adaptation algorithm to find the optimal configurations of various RF canceler filters using analytical modelling of tap non-idealities caused by frequency shifting and quality factor variations. The FD receiver achieves (i) tunable operation from 200MHz to 1GHz, (ii) wideband SI suppression of up to 53dB across 160MHz BW when operating at 720MHz (4.44x more fractional bandwidth (FBW) compared to [1]), (iii) a power consumption of 1.8mW/DoF (degree of freedom for each tap, almost 2x better than [1]), while (iv) handling TX power of up to +15dBm across an initial circulator isolation of 26dB.
AB - Wideband full-duplex (FD) transceivers pose a significant challenge as they require >100dB of self-interference cancellation (SIC) over large bandwidths. This work utilizes (i) a near-zero-power rotary clock-path passive frequency shifting technique for N-path filters while requiring only a single common LO signal across all filters, and (ii) a closed-loop adaptation algorithm to find the optimal configurations of various RF canceler filters using analytical modelling of tap non-idealities caused by frequency shifting and quality factor variations. The FD receiver achieves (i) tunable operation from 200MHz to 1GHz, (ii) wideband SI suppression of up to 53dB across 160MHz BW when operating at 720MHz (4.44x more fractional bandwidth (FBW) compared to [1]), (iii) a power consumption of 1.8mW/DoF (degree of freedom for each tap, almost 2x better than [1]), while (iv) handling TX power of up to +15dBm across an initial circulator isolation of 26dB.
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U2 - 10.1109/RFIC54547.2023.10186132
DO - 10.1109/RFIC54547.2023.10186132
M3 - Conference contribution
AN - SCOPUS:85166936094
T3 - Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
SP - 225
EP - 228
BT - 2023 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2023
A2 - Kitchen, Jennifer
A2 - Turner, Steven
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2023
Y2 - 11 June 2023 through 13 June 2023
ER -