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An electrical-balance duplexer achieving the state-of-the-art linearity and insertion loss (IL) performance is presented, enabled by a partially depleted RF silicon-on-insulator CMOS technology. A single-ended configuration avoids the common-mode isolation problem suffered by topologies with a differential low-noise amplifier. Highly linear switched capacitors allow for impedance balancing to antennas...
The electrical-balance (EB) duplexer concept explored in [1-4] suggests a possible integrated multiband alternative to conventional fixed-frequency surface-acoustic-wave (SAW) duplexers. The basic principle of the EB duplexer is to balance the impedances seen at the ports of a hybrid transformer to suppress signal transfer from the TX to the RX through signal cancellation (Fig. 2.2.1). While the potential...
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