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In this paper, we present a multi-string LED driver which is capable of driving five parallel LED strings with two series LEDs in each string. The current in the LED strings is regulated using a boost converter with a hysteretic control loop. Accurate current matching is achieved using a regulated cascode current mirror architecture. The loser-take-all circuit enables dynamic cancellation of LED forward...
A fourth-order Butterworth active Gm-C complex IF filter for dual-mode GNSS receiver is presented. This filter operates at center frequency of 7.161MHz and in bandwidth of 4MHz with pass-band gain of over 10dB and image rejection of over 35dB, which meets requirements of BD2 and Galileo Systems. The proposed CMOS fully differential transconductor has wide tuning range, high linearity and low power...
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...
Split-transistor compensation (STC) is introduced as a new compensation technique applicable to power management of Internet-of-Things (IoT) devices. An extension of the split-length compensation (SLC) technique [1]-[3], STC significantly reduces the area of the required on-chip compensation capacitor, while maintaining the two major benefits of SLC: reduced minimum supply voltage and no additional...
A scheme to achieve simultaneously extremely high slew rate improvement and avoiding open loop gain degradation in one stage super class-AB op-amps is introduced. It overcomes the serious shortcoming of super class-AB OTAs that show very high output current enhancement factors at the expense of degrading the open loop gain. The proposed scheme uses dynamically biased cascode transistors to avoid gain...
Physically unclonable functions (PUFs) facilitate many security applications such as secure key generation, device authentication, counterfeiting detection and prevention. This paper presents an area efficient PUF with high reliability. We exploit the process variation of a single load transistor for the current mirror working at the subthreshold region, which is converted to a unique digital signature...
Interfacing techniques for near-threshold computing are described in this paper. A bi-directional input/output circuit with integrated level shifters is proposed for multiple near-threshold power domains. The circuit provides conversion ranges of 0.38 V to 1.2 V and 0.45 V to 3.3 V depending on the targeted output voltage. Eight different configurations of I/O circuits are evaluated with level shifters...
A controlled comparison of three compensation techniques — nested Miller compensation (NMC), Split-Length compensation (SLC) and the new Split-Transistor compensation (STC) — is performed in a multi-stage low-dropout voltage regulator (LDO). The LDO with STC used 41% and 84% lower total compensation capacitance compared to the LDOs with SLC and NMC, respectively. To verify the proposed compensation...
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