A High Data-Rate Energy-Efficient Triple-Channel UWB-Based Cognitive Radio

This paper presents a fully integrated ultra wideband (UWB)-based cognitive radio (CR) transceiver for
$1\,{\text{Gb/s}}$
data-rate energy-efficient short-range wireless connectivity by scavenging triple discrete inactive frequency bands in 3.1–10.6
$\,{\text{GHz}}$
ISM band. The transceiver including receivers (RXs), transmitters (TXs), spectrum sensors, and synthesizers is implemented in
$1\,{\text{V}}$

$65\,{\text{nm}}$
standard CMOS technology. A novel pulse generator (PG) enables the TX to meet UWB emission mask and to reduce spectral sidelobe peak by
${< }{-}40\,{\text{dBc}}$
with low power consumption of
$3.6\,{\text{mW}}$
. A dual-mode RX front-end provides quadrature analog correlation (QAC) for analog domain matched filtering during communication and analog wavelet-based energy detection (ED) during spectrum sensing (SS) without changing circuitry. The transceiver achieves the minimum energy consumption of
$59.7\,{\text{pJ/b}}$
with
$1.97 \times {10}^{-4}\,{\text{bit error rate (BER)}}$
and the maximum energy consumption of
$102.3\,{\text{pJ/b}}$
with
$1.25 \times {10}^{-3}\,{\text{BER}}$
. Die area is
$4.6\,{{\text{mm}}^{2}}$
with on-die phase-locked loops (PLLs) and pads.