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We propose μLeech, a new embedded trusted platform module for next generation power scavenging devices. Such power scavenging devices are already widely deployed. For instance, the Square point-of-sale reader uses the microphone/speaker interface of a smartphone for communications and as power supply. While such devices are used as trusted devices in security critical applications in the wild, they...
We describe a highly-programmable integrated sustaining amplifier for reconfigurable MEMS-referenced oscillators. The frequency response, voltage gain, and phase shift of the amplifier can be independently controlled using bias currents, thus enabling it to be interfaced with a variety of MEMS devices with resonant frequencies in the 10–120kHz range. The chip, which was designed in 0.5μm CMOS, also...
The audio-susceptibility of the average current-mode controlled buck dc-dc converter in continuous-conduction mode is presented in this paper. The average current-mode control scheme used in this paper regulates the true average component of the sensed inductor current and is not affected by a high inductor current ripple at low duty ratios. The principle of negative feedback for converters with the...
In this study, a new voltage-mode fractional-order oscillator using two unity-gain voltage buffers, two operational transconductance amplifiers, one resistor, and two capacitors is presented. The design procedure of integer-order as well as fractional-order oscillator employing in total 20 MOS transistors is discussed. Effects of fractional-order capacitors on amplitude, phase, condition of oscillation,...
A general methodology of device array mismatch characterization is introduced, analyzed and verified. Instead of measuring each device's parameter individually, the device array is configured as a data converter and the mismatch information is extracted from the differential linearity (DNL) of the converter. Systematic and random mismatch are characterized separately using the proposed decomposition...
In this paper, the sensitivity of the optical receiver is revisited. An analytical expression that reveals the dependency of the sensitivity on both the data rate (fbit) and the bandwidth shrinkage factor (n) is derived. The proposed sensitivity model provides guidelines for selecting the front-end topology. Based on that model, a three-stage front-end is implemented in 65 nm CMOS technology and 18...
In this paper, an electronically tunable immitance circuit is proposed. The presented circuit can be configured as a tunable grounded inductor or capacitor multiplier. The proposed circuit employs a single active element called Voltage Differential Current Conveyor, a single resistor and a single capacitor. The presented circuit does not require element matching constraints. It is linearly tunable...
The voltage divider phase shift filter (VDPSF) has been used in the past to construct inductorless narrowband filters with moderately high Q values, for example, Q = 50. This work reports a new configuration of this filter that can achieve extremely high Q values over a range of frequencies from very low to very high values. A typical value is Q = 2500, but can be even higher. These high values of...
This paper proposes a novel fully differential ultra-low voltage transimpedance amplifier (TIA) based on a CMOS translinear circuit. Following a simple bias strategy, its transimpedance gain can be adjusted to the desired accuracy either by means of an external resistor or using internal voltage and current references. To a first order approach, the transresistance results independent from technological...
Printed electronics have gained increased interest in recent years, and printed sensors, which promise mechanically flexible multifunctional electronics over large areas, are raising remarkable attention. Numerous low cost printing technologies have been developed on different flexible/stretchable substrates including textiles. This paper presents a brief summary of various passive sensors (humidity,...
Conventional ring amplifier suffers from stability problem, the problem is exacerbated when process, voltage and temperature (PVT) variations are taken into considerations. Prior works are mainly focused on stability problem, the influence of PVT on transient response were barely discussed. In this paper the influence of process variations on stability and transient response is analyzed, a process-...
Gradient errors in device arrays cause mismatch between device parameters, which in turn degrade linearity performance of data converters realized with these arrays. A practical “outputs averaging” technique for string DACs is presented to release complex routing problems in gradient reduction patterns. An N-bit string is divided into multiple substrings and the substrings' outputs are averaged to...
A 40V tolerant current limited voltage source for a wide input current range is presented. Integrated current limited voltage sources are needed for diagnosis purposes in automotive applications like airbag squib drivers that deploy airbags. The topology proposed here overcomes the conventional on chip Zener based topology that is sensitive to process variations and provides reliable operation in...
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