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- W2246290274 abstract "A fully-integrated wireless transceiver (TRX) is presented for 750∼960MHz narrowband IoT applications by utilizing the guard band of mobile communication systems. The TRX consists of a low-IF receiver with 180 kHz signal bandwidth, a mixed-signal polar transmitter with 3.75 kHz signal bandwidth and a fractional-N frequency synthesizer. Current passive mixer is employed in the low-IF receiver to achieve lower 1/f noise and higher linearity. The on-chip I/Q imbalance calibration is integrated to improve the image rejection ratio (IRR) which could be realized automatically cooperated with one FPGA. The transmitter features polar architecture and inverse class-D PA to achieve high output power and efficiency. The thermometer coding and binary-coding-based array placement simplify the DPA layout and reduce the mismatch between the DPA cells. The RX achieves 4.01dB NF, 48dB IRR and 5∼65dB dynamic range. The DPA provides 23.2dBm maximum saturation power with 44.5% PAE. Furthermore, TX system verifications demonstrate 3.87% EVM for 891MHz n/4-DQPSK signals at 18.87dBm output power with −40dBc out-of-band rejection. The transmitter achieves a dynamic range from −35dBm to 20dBm while the demodulation threshold of the system is 10% (EVM)." @default.
- W2246290274 created "2016-06-24" @default.
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- W2246290274 date "2015-11-01" @default.
- W2246290274 modified "2023-09-27" @default.
- W2246290274 title "A 180nm CMOS wireless transceiver by utilizing guard band for narrowband IoT applications" @default.
- W2246290274 cites W2004197248 @default.
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- W2246290274 doi "https://doi.org/10.1109/asscc.2015.7387496" @default.
- W2246290274 hasPublicationYear "2015" @default.
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