A 10.56-GHz Broadband Transceiver with Integrated T/R Switching via Matching Network Re-use in 28-nm CMOS Technology

In this paper, in which an innovative architecture with ultra-compact transformer-based transmit/receive (T /R) switching via matching network reuse is introduced to certify the input noise matching of low-noise amplifier (LNA) and the output matching of power amplifier (PA) simultaneously. A three-coil transformer is introduced in the PA input-stage to change the optimum load impedance of PA output stage, thereby further increasing the output power of PA without affecting the noise match of LNA, due to the linearity enhancement technology the Pout and Psat of PA increased about 3.4 and 3.3-dBm, respectively. The new architecture is implemented in a 28-nm CMOS technology. Test results prove that the insertion loss of the proposed T/R switch introduced at the RX and TX end is only 1.5-dB, benefit from this, RX obtained 4.3-dB noise figure, TX obtained 9.9 and 14.1-dBm OP
_1dB
and Psat. With the matching network re-using T/R switch the whole transceiver only occupies 2.4*2.4 mm
^{^}
2 chip area.