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In the next generation of mobile network, 5G, mm-wave (mmW) communication is considered one of the main disruptive technologies to increase data rates and improve spectrum efficiency. Wireless backhaul with stationary or moving nodes is one of the best candidate use-cases. This paper provides a comprehensive analysis on the architecture and design of mmW transceiver with automatic gain control (AGC)...
Saw-Less Frequency Division Duplexing and Full-Duplex transceivers require very high receiver linearity. Self-Interference Cancellation can relax the specification but results in very high power. We propose a low-power direct-conversion single-ended receiver with passive SIC. A 28 nm CMOS prototype achieves an effective IIP3 > 25 dBm for both IB and OOB SI with only 20 dB cancellation and 25 dB...
A mixer-first receiver enhanced with capacitive positive feedback is proposed to obtain a steeper filter roll-off and enhanced linearity, while keeping low noise figure. It covers all sub-6GHz cellular bands and achieves a high IIP3 of +39dBm and blocker 1dB gain compression point of +12dBm for a blocker frequency-offset of 80MHz at fLO=2GHz. The NF ranges from 2.4dB at fLO=1GHz to 5.4dB at fLO=6GHz...
A 2.4 GHz 365nW wake-up receiver (WuRX) with RF envelope detection using rectifier-antenna co-design for passive voltage gain and RF filtering is presented. The RF frequency-tunable WuRX uses a programmable 32-bit OOK wake-up signature, achieving sensitivity of −61.5dBm for 2.5 kb/s without any off-chip matching components between IC and antenna. RF filtering in the high-Q rectifier-antenna interface...
The IEEE 802.22 system was standardized in 2011 as a fixed wireless communication system for regional area networks using TV white-spaces (TVWS). Due to its wide coverage area of 10–30 km, the IEEE 802.22 system is expected as a backbone wireless network system in developing countries as well as a public safety broadband communication system even in leading countries. This wide coverage enables a...
In this paper we present a chip-set of 4 wideband SiGe BiCMOS transceivers optimized for the stringent specifications of various microwave links in the 5–44 GHz range. Each receiver and transmitter covers full frequency bands of 5.6–8.5 GHz, 10–15.5 GHz, 17.5–26.5 GHz and 27–43.5 GHz and demonstrates high dynamic range and excellent noise figure and linearity. Radio links demonstrate error-free operation...
This paper presents a new harmonic rejection mixer (HRM) circuit that uses resistive scaling to achieve very high linearity and a harmonic rejection ratio (HRR) greater than 35 dBc. The mixer employs 4 double-balanced mixers driven by 8 LO phases with 12.5% duty cycle to isolate different paths. The mixer switches have been implemented with thin- and thick-oxide transistors to improve linearity further...
This paper presents a 65 nm CMOS 25–30 GHz hybrid beamforming receiver with eight antenna inputs and two baseband output streams. The receiver uses the Cartesian-Combining architecture, which is introduced for two baseband streams. Each antenna signal is complex-weighted independently and combined with weighted signals from other antennas prior to downconversion. Each RF-domain complex weight is realized...
This work presents the design of a dual band frequency modulated continuous wave (FMCW) radar receiver (RX) at the 2.4 and 5.8 GHz industrial, scientific and medical (ISM) bands. The designed low noise amplifier (LNA) has a single ended 50 Ω input stage followed by an active balanced-to-unbalanced (balun) stage. The radio frequency (RF) signal is then down-converted to a low intermediate frequency...
A 4-state, highly linear, reconfigurable mixer is presented in this paper. The proposed mixer is an essential part of the environment-aware receiver, introduced in this article. A set of switches are used in the LO and IF stages of the mixer to digitally tune the linearity of the mixer in exchange for lower power consumption. Three sets of cross-coupled pairs are utilized in the mixer to dynamically...
This paper presents a MICS/ISM band receiver for ultra-low-power applications with a passive RF front-end. A shunt passive mixer along with low input capacitance amplifiers is introduced to decrease the large load capacitor and minimize power consumption of the Local Oscillator (LO) buffers without significant noise figure (NF) degradation. Measurement results show that the receiver consumes 89 μW...
The bandwidth of the RF amplifier severely limits the use of gain-boosted N-path receivers at high frequencies. Apart from limitation on the achievable impedance matching, the noise figure degradation severely handicaps the performance of the receiver. This paper describes a linear periodically time-variant (LPTV) analysis of the gain-boosted N-path receiver taking the amplifier bandwidth into consideration...
Identifying an object's spatial direction (or orientation) plays a fundamental role in a variety of applications, such as automatic assembly, indoor navigation, and robot driving. In this paper, we design a fine-grained direction finding system called Tag-Compass that attaches a single tag to an object (whose size may be small) and identifies the tagged object's orientation by determining the spatial...
Cascaded integrator-comb (CIC) filters in a direct-RF sampling receiver reduce the quantization noise of an analog-to-digital converter (ADC) and out-of-band blockers being folded into the signal band. A higher order provides more attenuation for them but proportionally increases the power consumption and chip area. We present the procedure to determine the orders of a multistage CIC filter by using...
This paper presents a wideband blocker-tolerant Direct ΔΣ receiver (DDSR). Blockers are attenuated through selective input impedance matching and optimized gain design. The created impedance profile provides low receiver input impedance at blocker frequencies, while at desired frequencies, the impedance is boosted to matched condition through an up-converted positive feedback from the DDSR output...
A new wake-up receiver (WuRx) designed in 0.13 μm CMOS process is hybrid-integrated with a micro-electromechanical system (MEMS) RF resonator. While only consuming 166 nW of power (18.8 nW for the comparator and 147 nW for periphery), the WuRx is capable of detecting RF signals as weak as −60 dBm. In order to achieve this sensitivity, a passive voltage-boosting network comprised of a high quality...
Integrated GPS receivers have become a basic module in location based services, such as position sharing, wild animal monitoring, and location tracking. However, GPS modules have a serious battery drain problem due to their high computation load. This paper aims to reveal the impact of key software parameters on GPS energy consumption, by establishing an energy model for a standard GPS receiver architecture...
Software Defined Radio (SDR) is an emergent technology for future network centric operations as it can support dynamism of Mobile Adhoc Networking (MANET) waveforms through its inherent benefits of re configurability, portability and reusability. Unlike conventional radio, designing Physical layer for MANET waveform over SDR platform demands a new design approach and consequently must be tested thoroughly...
This work presents a novel method we call: Frequency Injection Interfacing (FII), for OFDM communication systems. With FII, an external system or observer can communicate to an OFDM receiver through a frequency encoder that injects additional frequency content into the received signal. Specifically, the null subcarriers at the edges of the OFDM waveform are turned on or off to represent a binary code...
Hybrid Analog-Digital transceivers are employed with the view to reduce the hardware complexity and the energy consumption in millimeter wave/large antenna array systems by reducing the number of their Radio Frequency (RF) chains. However, the analog processing network requires power for its operation and it further introduces power losses, dependent on the number of the transceiver antennas and RF...
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