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

Abstract

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 dualway communication between users and the central control station via satellites. The receiver (RX) RF frontend 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 mm 2 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. INDEX TERMS BeiDou-1, RF transceiver, radio determination satellite service system, low-IF receiver, complex band-pass filter, on-chip low dropout regulators.

Design of Chinese-English Wireless Simultaneous Interpretation System Based on Speech Recognition Technology

“…e chairman unit, the delegate unit, and the translator are used for data communication through the nRF24E1 wireless transceiver chip. eir basic circuits are all similar [6], as shown in Figure 2. e nRF24E1 chip is the core of the wireless data acquisition and transceiver part.…”