Abstract
In this research work, a reconfigurable 2.45-GHz RF-DC converter realized in a 180-nm complementary metal-oxide semiconductor (CMOS) technology is proposed to efficiently harvest electromagnetic energy. The proposed circuit is composed of a low-power path rectifier, a high-power path rectifier, and an adaptive path control (APC) circuit. The APC circuit is made-up of a comparator, two switches, and an inverter. The APC circuit senses the output voltages of the low-power path and the high-power path rectifiers and generates a control signal to automatically switch the proposed circuit between the lower-power path and the high-power path operation depending upon RF input power level. The proposed circuit obtains more than 20% measured power conversion efficiency (PCE) from −6 dBm to 11 dBm input power range with maximum efficiencies of 41% and 45% at 1 and 6 dBm input powers, respectively, for 5 kΩ load resistance. In addition, the proposed circuit shows excellent performance at 900 MHz and 5.8 GHz frequencies.
Highlights
In the past decade, an unprecedented development has been witnessed in the field of wireless power transfer (WPT)
As the power harvested from the ambient is limited, designing a low-power adaptive adaptive path control (APC)
Measurement results show that low-power path rectifier achieves high power conversion efficiency (PCE) than the the high-power rectifier
Summary
An unprecedented development has been witnessed in the field of wireless power transfer (WPT). An adaptive power harvester reported in [16] is composed of two differential sub-rectifiers and a control circuit. Power harvester reported in [16] is composed of two differential sub-rectifiers and a control circuit. The circuit reported power range by selecting optimum number rectifier stages based on levels. A self-biasing technique reported in [24] consists of an network off-chip to produce compensation voltage for rectifying devices. In [25], CMOS a dual rectifier path differential adaptive control circuit is reported. NMOS limitation of this approach is that each cross-coupled rectifier path uses five stages which results more switches areMoreover, in the path of RFswitches input signal increase the parasitic capacitance causing more power loss.
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