Integrated Low-Loss CMOS Active Rectifier for Wirelessly Powered Devices

Efficiency Evaluation of a MOSFET bridge rectifier for Powering LEDs using Piezo-electric Energy Harvesting Systems

“…MOS-FET Bridge AC to DC converter is one which replaces the passive diodes in the conventional AC to DC converter [8] with an operational amplifier-controlled counterpart and a switch is added across the transducer. The proposed MOSFET Bridge AC to DC converter reduces the conduction drop, so that the maximum power is extracted from the transducer [9].This leads to better conversion capability and power extraction. Fig.4 shows the circuit diagram of a MOSFET bridge AC to DC converter with switch control.…”

“…The delay for switch control is achieved by the combination of NOT gates. The input to the delay circuit is provided by detecting the zero crossing of the P and N node voltages [9]. Similarly during the negative half cycle the same modes of operation occur but here M P 2 and M N 1 are involved.…”

A High Efficiency 0.13μm CMOS Full Wave Active Rectifier with Comparators for Implanted Medical Devices

“…Rectifiers are usually designed to use conventional diodes that have a built drop voltage of 0.7V, which is suitable for conventional applications but it is unusable for circuits running on power supplies of 1V or less. Alternatively to the conventional diodes, Schottky diodes can be used, but the manufacturing process of low forward drop voltage can be more expensive than the traditional processes [4] because they might not be present in some regular processes and require extra fabrication steps [5]. An alternative is the use of diode connected MOS transistors to replace the conventional diodes in a bridge connection.…”

“…An alternative is the use of diode connected MOS transistors to replace the conventional diodes in a bridge connection. CMOS transistors connected as diodes can work at high frequencies, such as the Scientific and Medical -ISM band (13.56MHZ) that has been widely used [4,5,6]. One problem of this solutions is that diode connected MOS transistors in a bridge connection offers low ON-OFF switching speed which in turn creates an undesirable reverse current.…”

A High-Efficient Low-Voltage Rectifier for CMOS Technology

“…The last of the aforementioned problems, the reverse flow of the leakage current, is frequently solved by using complicated circuits for controlling the moments of switching on and off the MOS transistors. Due to the need for using voltage comparators, such solutions have a very limited bandwidth, typically below 20−30 MHz [12,13].…”