A Fully-Integrated Reconfigurable Dual-Band Transceiver for Short Range Wireless Communications in 180 nm CMOS

Abstract

?? 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.A fully-integrated reconfigurable dual-band (760-960 MHz and 2.4-2.5 GHz) transceiver (TRX) for short range wireless communications is presented. The TRX consists of two individually-optimized RF front-ends for each band and one shared power-scalable analog baseband. The sub-GHz receiver has achieved the maximum 75 dBc 3rd-order harmonic rejection ratio (HRR3) by inserting a Q-enhanced notch filtering RF amplifier (RFA). In 2.4 GHz band, a single-ended-to-differential RFA with gain/phase imbalance compensation is proposed in the receiver. A ???? fractional-N PLL frequency synthesizer with two switchable Class-C VCOs is employed to provide the LOs. Moreover, the integrated multi-mode PAs achieve the output P1dB (OP1dB) of 16.3 dBm and 14.1 dBm with both 25% PAE for sub-GHz and 2.4 GHz bands, respectively. A power-control loop is proposed to detect the input signal PAPR in real-time and flexibly reconfigure the PA's operation modes to enhance the back-off efficiency. With this proposed technique, the PAE of the sub-GHz PA is improved by x3.24 and x1.41 at 9 dB and 3 dB back-off powers, respectively, and the PAE of the 2.4 GHz PA is improved by x2.17 at 6 dB back-off power. The presented transceiver has achieved comparable or even better performance in terms of noise figure, HRR, OP1dB and power efficiency compared with the state-of-the-art

A 400MHz Single‐Chip CMOS Transceiver for Long Range High Definition Video Transmission in UAV Application

“…Aiming at the high speed and long range wireless transmission, we have designed a 300-to-400MHz transceiver together with high efficiency wide band modulation schemes such as QPSK/QAM. By applying delicate system planning and circuit design, the transceiver achieves a transmission data rate up to more than 72Mbps, -75dBm of the sensitivity under 54Mbps data rate which is comparable to some best published works [3,4] , and at the same time, the communication distance is much more longer than that of the 2.4GHz transceivers. The transceiver with above specification can be applied to high definition wireless video transmission in UAV.…”

“…The output spectrum are both well under the required spectrum mask for IEEE 802.11a standard. Table 2 summarizes the transceiver performance and makes a comparison between this work and other stateof-art transceivers [3,4,13] . Compared with other works, our proposed transceiver has the advantages in RX sensitivity and better TX EVM under the same data rate transmission.…”

“…In this HD video transmission system, narrow band, high sensitivity control channel and wide band, high speed data channel are supported simultaneously, so that Low-IF architecture is chosen for control signal and Zero-IF architecture is chosen for data signal. The Low-IF bandwidths consist of 120kHz and 360kHz which is prepared for potential low data rate applications to avoid the performance degradation caused by 1/f noise and DC offsets [4] . The Zero-IF bandwidths from 2.8MHz to 14MHz is tunable for high data rate applications to reduce the power consumption.…”

Low-Power, Low-Voltage Complex Gm-C Filter Structure With Self-Common-Mode Control

“…as in the design in Section IV, both (12) and (13) yield OPR = 5/, e.g., the OPRs are 5.0 and 3.3 for  = 1.0 and 1.5, respectively. Note that, the factor  plays a vital role in the filter's noise performances as will be analyzed in Section III.D.…”

An energy-efficient communication system using joint beamforming in multi-hop health monitoring sensor networks

“…For example, our design can detect packet collision in the PHY layer based on preamble and then feed the information to the MAC layer. Numerous OFDM transceiver designs have been reported in literature; we note [10], [11], and [12] for their focus on short-range communication or OFDMA baseband design. As compared to [11], we have proposed significantly more flexible and advanced design for the OFDM receiver.…”