A CMOS RF BeiDou-1 Transceiver for Regional Positioning and Short Message Service Applications

This paper presents a fully integrated CMOS radio-frequency (RF) transceiver for BeiDou-1, a radio determination satellite service system which can provide regional positioning and short message service. The proposed transceiver incorporates a low-IF receiver and a BPSK transmitter to realize a dual-way communication between users and the central control station via satellites. The receiver (RX) RF front-end down-converts the 2491.75 MHz RF signals to a 12.24 MHz IF band with a bandwidth of 8.16 MHz. The complex band-pass filter utilizes passive compensation technique to compensate the phase lag and achieve in-band flatness. The 4.08 Mchip/s baseband signal alternatively selects one of the differential 1615.68 MHz local signals to achieve BPSK modulation for the transmitter (TX). Besides, on-chip low dropout regulators adopt improved power supply rejection ratio techniques by integrating active filtering to obtain stable 1.5 V supply voltages. The transceiver is fabricated in a 130 nm CMOS technology and occupies an area of 5.88 mm2 with electrostatic discharge circuitry and pads included. The RX channel achieves a 106 dB maximum voltage gain with a 65 dB dynamic range, a 4.95 dB noise figure and a 46 dB image rejection ratio. The output power for the TX ranges from −10 dBm to 5 dBm, with a phase error less than 1.5 degree.

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