A 16mA UWB 3-to-5GHz 20Mpulses/s Quadrature Analog Correlation Receiver in 0.18/spl mu/m CMOS

A 4.8-mW 10-Mb/s Wideband Signaling Receiver Analog Front-End for Human Body Communications

“…Table II summarizes the performance of the AFE. The AFE achieves the reception bit energy of 0.48-nJ/bit, which is 20 times more efficient than the UWB receiver in [4]. Therefore, the proposed AFE provides energy-efficient communications around the human body.…”

“…Alternatively, the UWB receivers have been widely developed to achieve higher data rate operation, but must operate at vast bandwidth inherently leading to increase of power dissipation. For example, according to [4], an UWB receiver based on impulse radio was reported with power consumption of about 30-mW at 3-to-5GHz bandwidth for wearable and wireless body area networks. In addition, it faces increasing cost for additional RF process, severe interference problem at very short range around human body, and FCC regulation.…”

Impulse-Based Scheme for Crystal-Less ULP Radios

“…For narrowband modulations (such as OOK, FSK or QAM), the specifications on frequency accuracy is very strict, since the allowed frequency error required at the receiver is directly proportional to the bandwidth of the RF signal. A possible solution can be the adoption of an Ultra Wide Band (UWB) system employing Impulse Radio (IR) modulation scheme [7]; the RF signal occupies a bandwidth of hundreds of MHz to comply with the radio regulations and a fully integrated reference for this application can be easily built. However, it will be difficult to meet the power requirements at the receiver due to the inherent wideband nature of UWB receiver.…”

A fully differential IR-UWB front-end for noncoherent communication and localization

“…Several different IR-UWB receiver architectures have been published, including analog correlation [2], [3], acting like a matched-filter receiver when operated with a properly synchronized template signal, and non-coherent energy detection. Previous works [4], [5] used single-ended circuit topologies, and employed the 3-5 GHz low band.…”