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The Direct RF-to-Information Converter (DRF2IC) unifies high sensitivity signal reception, narrowband spectrum sensing and energy-efficient wideband interferer detection into a fast-reconfigurable and easily scalable architecture. In reception mode, the DRF2IC RF front-end (RFFE) consumes 46.5mW and delivers 40MHz RF bandwidth, 41.5dB conversion gain, 3.6dB NF and −2dBm B1dB. 72dB out-of-channel blocker...
An IM3 cancellation technique is proposed and implemented in a 65nm CMOS 0.5–2.5GHz FTNC (frequency translational noise-cancelling) receiver with a wideband auxiliary path which also offers wideband interferer awareness. It achieves 8.8MHz BB BW, 40dB conversion gain, 3.3dB NF, +5dBm OB-IIP3, and −6.5dBm OB-B1dB without IM3 cancellation while consuming 36mW at 1.2V. Using IM3 cancellation, the equivalent...
Next-generation (Next-G) wireless terminals need to sense their ambient and adapt to the diverse deployment scenario requirements on the fly while leveraging technology scaling. Several key circuit and system innovations are required to make the realization of this vision possible. We discuss how compressed sampling can be exploited to design a rapid, GHz-wide and energy-efficient interferer detector...
To meet the demands of ever-increasing data throughput, carrier aggregation (CA) across frequency bands is becoming necessary. Different regional spectrum allocations lead to a large number of band combinations and challenge the antenna interface performance for inter-band CA. A dedicated antenna for each carrier severely increases the form factor of the device. Splitting the antenna signal with filter...
A field-programmable noise-canceling wide-band receiver front end with high performance LNTAs is presented. The common-source (CS) and common-gate (CG) LNTAs are split into several cells whose bias point can be individually programmed in class AB or C yielding a highly linear hybrid class-AB-C LNTA. The 40nm LP CMOS receiver prototype can be programmed on the fly to adapt to different RF environments;...
A 0.2–1GHz RF front end with a harmonic-rejecting N-path filter (HR-NPF) features tunable narrow band filtering as well as high attenuation at the 3rd and 5th order LO harmonics at the LNA output. The B1dB-CP is −2.4dBm at a 20MHz offset, and remains high at the 3rd and 5th LO harmonics thanks to the HR-NPF configuration. The reverse isolation of the LNA helps to keep the LO emission below −90dBm...
A low noise amplifier is presented that uniquely achieves wide-band input matching and good low-frequency noise performance at the same time. Its topology is a hybrid of distributed amplifier and a common-source common-gate noise-canceling amplifier. The proof-of-principle prototype in 65nm CMOS operates from DC up to 9.5GHz with more than 12dB gain, achieves a minimum noise figure of 2.8dB, P1dB...
This paper focuses on a new type of wireless devices in the domain between RFIDs and sensor networks — Energy Harvesting Active Networked Tags (EnHANTs). Future EnHANTs will be small, flexible, and self-powered devices that can be attached to objects that are traditionally not networked (e.g., books, toys, clothing), thereby providing the infrastructure for novel tracking applications. We present...
EnHANTs will be small, flexible, and self-powered devices that will be attached to objects that are traditionally not networked (books, furniture, clothing), thereby enabling various tracking applications (more details are available at enhants.ee.columbia.edu). We demonstrate a small testbed of En- HANTs prototypes. The prototypes communicate using in-housedeveloped ultra-wide-band impulse radio (UWB-IR)...
Considering that ordinary ZigBee based systems operate at a rate of 250 kbps, which imposes various limitations on their applications, and that there are 16 independent channels at 2.4 GHz, this paper presents a novel approach of FPGA controlled, ZigBee protocol based multi-frequency high speed wireless Ad Hoc network. The system employed five individual ZigBee modules around a FPGA controller, merging...
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