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Design and Analysis of an Electrical Balance Duplexer With Independent and Concurrent Dual-Band TX-RX Isolation.
- Source :
- IEEE Journal of Solid-State Circuits; May2022, Vol. 57 Issue 5, p1385-1396, 12p
- Publication Year :
- 2022
-
Abstract
- An electrical balance duplexer (EBD) supports dual-band TX-RX isolation enabling frequency-division duplexing (FDD) operation at 5-7 GHz for Wi-Fi 6/6E. A programmable balance network in the EBD can balance the antenna impedance ($Z_{\text {ANT}}$) in the TX channel and RX channel independently and simultaneously. An on-chip passive bandstop filter as a part of the balance network is implemented, achieving sub-2-dB passband insertion loss (IL) and >20-dB stopband rejection with 10% frequency spacing. This filter separates two impedance tuners in the balance network and enables the independent tunability at two bands. A comprehensive and rigorous analysis of general LCR two-ports shows the limit of the $s_{21}$ frequency selectivity when built with finite- $Q$ elements. The analysis guides the filter design, which guarantees the maximum frequency selectivity. The analysis is then extended to LCR ${N}$ -ports as the complete analysis. The EBD provides >40-dB isolation in an 80-MHz channel bandwidth in the TX band (5-6 GHz), for any $Z_{\text {ANT}}(f_{\text {TX}})$ within VSWR = 2, and independently in the RX band (6-7 GHz) when $Q_{\text {ANT}}< 4.3$. The EBD is designed for ≤4-dB RX IL and ≤3.8-dB TX IL, and it supports +29-dBm TX output. The EBD is implemented in Towerjazz 65-nm RF silicon-on-insulator (SOI) CMOS technology and occupies an area of 2.3 mm2. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189200
- Volume :
- 57
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- IEEE Journal of Solid-State Circuits
- Publication Type :
- Academic Journal
- Accession number :
- 156496552
- Full Text :
- https://doi.org/10.1109/JSSC.2021.3135509