| dc.description.abstract | This study presents 2.45 / 5.5 GHz concurrent dual-band low-noise amplifier (LNA) and dual-band power amplifier (PA) designs that employ dual-band bridge-T coil-based miniature dual-band impedance matching network. The proposed concurrent dual-band amplifiers are targeted for application in the 2.4- and 5-GHz bands of the IEEE 802.11 WLAN system. First, the proposed dual-band LNA adopts the cascode common source inductive degeneration topology, and dual-band impedance matching circuits are employed to achieve simultaneous noise and impedance matching at two operation frequencies. The proposed 2.45 / 5.5-GHz dual-band LNA is implemented through the heterogeneous integration of TSMC 0.18-μm CMOS and AFS Corp. integrated passive device (IPD) technologies, and the overall circuit size is 2.85 mm × 1.75 mm. At 2.45 / 5.5 GHz, the measured small signal gain is 15.6 / 12.1 dB, the measured input and output return loss are better than 10 dB, the measured noise figure is 2.6 / 2.8 dB, while the measured input P1dB and input IP3 are -18 / -14 dBm and -5.5 / -2 dBm, respectively. The measured power consumption under a VDD of 1.8 V is 11.9 mW. Next, the proposed dual-band PA is operated in the class-AB mode, and it utilizes dual-band impedance matching circuits to achieve maximal output power delivery at the two operation frequencies. The proposed 2.45 / 5.5-GHz dual-band PA is implemented in WIN 0.15-μm pHEMT GaAs technology, and the chip area is 2.5 mm × 2.0 mm. The measurement output power is 24.3 / 24.6 dBm while the peak power added efficiency (PAE) is 31.4 / 32.6 % at 2.45 / 5.5 GHz. The measured small signal gain and input return loss are 12.9 / 9.3 dB and 11.9 / 11.9 dB at 2.45 / 5.5 GHz, respectively. Under the IEEE 802.11ac EVM and transmit spectrum mask specifications, the maximum output power for 16-QAM modulation is 19.1 / 20.3 dBm, while the EVM and ACPR are -27.3 / -27.4 dB and -29.0 / -28.6 dBc, respectively. Through these two dual-band amplifier design examples, this study proves the feasibility of dual-band bridge-T coils for dual-band impedance matching network designs. | en_US |