Rectigulator: a hybrid of rectifiers and regulators for miniature wirelessly powered bio-microsystems

High-efficiency high-current drive power converter IC for wearable medical devices

“…In [4], the behaviour of the regulating PMOS is similar to that of the LDO, whose PMOS is operating in the linear region. The problem of high dropout voltage in [4] is solved by the adaptive rectifier [5]. In this circuit, the rectifier output is controlled by a feedback loop and can be adjusted to an appropriate level before LDO.…”

“…Similar types of the power stage transfer function can be compensated by either a type-II or a type-III compensator [11]. In this case, we use a type-II compensator because there are fewer components in the compensation network than the type-III c Active rectifier, with/without DC limiter, and LDO [3] d Rectigulator or adaptive rectifier and LDO [4,5] e Switching rectifier (Boost) and LDO [6] compensator. To reduce the system noise, the bandwidth of the loop is selected at 50 kHz, and the phase margin is at 50 degree.…”

“…1d, the rectifier and the regulator circuits are combined together to form an adaptive rectifier or a recti-gulator [4,5]. In [4], the behaviour of the regulating PMOS is similar to that of the LDO, whose PMOS is operating in the linear region. The problem of high dropout voltage in [4] is solved by the adaptive rectifier [5].…”

A fully integrated AC-DC regulator over wide frequency range for implantable bio-medical devices

“…In conventional AC-DC regulator, a rectifier is adopted to convert AC power to unregulated DC power and a regulator is used to reduce output voltage ripple. A novel circuit called "rectigulator", which stands for the hybrid of rectifier and regulator, using two negative feedback channels in turn to convert AC power to DC power was verified by discrete components [1]. However, with MUXs which generate pulse controlling signal, the circuit suffers from digital noise like traditional DC-DC regulator.…”

“…Similar to [1], the three cross-couple structures M 1-M6 work as a rectifier which converts AC input to unregulated DC output.…”