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In this paper, a versatile, re-programmable, current-input bioinstrumentation board is presented for electrochemical amperometric measurements. The proposed instrument has been fabricated on a six layer printed circuit board (PCB) and exploits dual switched-capacitor (SC) integration and sample-and-hold (SH) techniques. It comprises off-the-shelf switch and amplifier ICs and a commercially available...
This paper presents an efficient on-chip switched-capacitor DC-DC buck converter targeting μW power range applications. The proposed switched-capacitor converter has an input of 1.2V and generates multiple output voltage levels, namely 1V, 0.8V and 0.6V based on two digital bits. In addition, the switched-capacitor converter has the capability to drive a wide range of load currents from 10μA to 800μA...
Switched Capacitor (SC) converters have been used for several years in low-power, power electronic energy conversion systems. However, because of their attractive features such as low-weight and high-density energy conversion and with the emergence of new circuit topologies and SiC switching devices, these circuits have recently been proposed for higher power applications. The resonant switched capacitor...
In this paper, we present a single to independent two-phase matrix converter (iS2MC) consisting of eight Gallium Nitride (GaN) based monolithic bidirectional switches for the first time. The modulation algorithm for the switches in the iS2MC was designed more easily than that in the three-phase matrix converter. So far, common emitter back-to-back Insulated Gate Bipolar Transistor (IGBT) configuration...
This paper proposes an estimation algorithm of phase currents of inverter systems with the planar bus bars for brushless DC motors (BLDCM). In these inverters, a DC-link single current sensor measures the sum of a smooth capacitor current and phase currents of BLDCM. It is essential to extract phase currents from the measured single current to control BLDCM. Therefore, in this paper, the phase current...
The article will describe possibilities and utilization of controlling of magnetic energy recovery switch, as well as simulation and practical realization of this device. The article is devided to four parts. The first part deals with MERS circuit description. MERS simulation is the goal of the second part. The third part contains measurement description and analysis of obtained measured results....
To effectively reduce output ripple of switched-capacitor DC-DC converters which generate variable output voltages, a novel feedback control scheme is presented. The proposed scheme uses pulse density and width modulation (PDWM) to reduce the output ripple with low output voltage. The prototype chip was implemented using 65nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented proper for low-voltage Switched-OPAMP (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled...
In recent studies,1,2 switching characteristics of PVDF were investigated in the time domain by measuring charge and current responses to the stepwise application of electric fields in circuits with RC time constants smaller than 1 µS. Switching times for polarization reversal of 4 µS and larger were reported depending on the field strength and temperature.1,2 Similar shapes of current vs. time curves...
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