1,721,335 research outputs found
A 4.1-mW 10-MHz Fourth-Order Source-Follower-Based Continuous-Time filter with 79-dB DR
No full textIn this paper, a “composite” source-follower is presented. Using a positive-feedback, the structure synthesizes complex poles with a single branch. This allows to realize a single-branch biquadratic cell. Moreover, due to the intrinsic feedback present in any source-follower, the proposed cell performs larger linearity for smaller Vov (=VGS-VTH ). This is the opposite of other active filters and allows saving the power otherwise used to increase linearity. A fourth-order prototype satisfy typical WLAN 802.11.a/b/g baseband filter specifications has been realized in a 0.18um CMOS at 1.8-V supply. It achieves a 17.5-dBm IIP3 and a -40dB HD3 for a 600-mVpp_diff input signal amplitude. A 24-uVrms noise gives a DR = 79 dB, with 2.25mA current consumption
A 0.23 μ, 96 mV Input Voltage DC-DC Converter for Body Sensor Nodes
No full textThis paper presents an ultra-low power DC-DC converter to be embedded into body sensor nodes. The proposed DC-DC converter is used to step-up the voltage at the output of a micro-thermoelectric generator up to a usable supply voltage between 0.42 and 1.05 V. Measurements have been conducted on ten available samples. The resulting mean value of the minimum input voltage is 96 mV. At the minimum input voltage, the power consumption is only 0.23 . The operating temperature ranges from -40 °C to 100 °C
A 0.23μW, 96 mV Input Voltage DC-DC Converter for Body Sensor Nodes
No full textThis paper presents an ultra-low power
DC–DC converter to be embedded into body sensor nodes.
The proposed DC–DC converter is used to step-up the voltage
at the output of a micro-thermoelectric generator up to a usable
supply voltage between 0.42 and 1.05 V. Measurements have
been conducted on ten available samples. The resulting mean
value of the minimum input voltage is 96 mV. At the minimum
input voltage, the power consumption is only 0.23 μW. The
operating temperature ranges from −40 °C to 100 °C
A CMOS-28nm 880-MHz 4th-order low-pass active-RC filter for 60 GHz transceivers
No full textIn this paper a 4th order low-pass continuous time analog filter in CMOS 28nm technology is presented. The filter complies with the specifications of the 60GHz next-generation transceivers. A novel circuital topology is presented suitable to perform the low-pass filtering of the in-band signal, while the in-band thermal noise is high-pass filtered, improving Signal-To-Noise-Ratio. 880MHz -3dB bandwidth is obtained by a prototype of the filter simulated in 28nm CMOS technology. The overall power consumption is 4.8mW from a single 1 V supply voltage. 51dB@THD>40dBc is the SNR at 0dB gain. © 2013 IEEE
A 1uA Front-End for Pacemaker Atrial Sensing Channels
No full textA low-power front-end for a pacemaker atrial sensing channel based on peak detection is presented. The very tight system specifications in terms of power consumption and output noise, the need to operate with a supply voltage decreasing from 2.8 V to 2 V during the battery lifetime, and additional functionalities with respect to standard front-ends, like gain programmability and early sensing, make the design of this system a challenge. The front-end includes a preamplifier and a 3rd SC filter, and it is fabricated in a 0.8 μm CMOS technology. It features a 1 μA current consumption from a single nominal 2.8 supply (which, however, can decrease down to 2V), 5.1 mVrms total output noise and a maximum voltage gain of 740
A 1-uA Front End for Pacemaker Atrial Sensing Channels with Early Sensing Capability
No full textA low-power front end for a pacemaker atrial sensing channel based on level detection is presented. The very tight system specifications in terms of power consumption and output noise, the need to operate with a supply voltage decreasing from 2.8 to 2 V during the battery lifetime, and additional functionalities with respect to standard front ends, like gain programmability and early sensing, make the design of this system a challenge. The front end includes a preamplifier and a third-order switched capacitor filter, and it is fabricated in a 0.8 μm CMOS technology. It features a 1 μA current consumption at a supply voltage of 2.7 V, and an input referred total noise of 6.9 μVrms
2-D Video Rate SC FIR Filters Based on Analog RAMs
No full textMonolithic CMOS analog implementations of video systems are extremely attractive because of their low area and power requirements. Switched-capacitor circuits may advantageously replace many current digital solutions of video systems. However, special care must be used in order to handle, with standard CMOS technology, the problems related to the broadband characteristics of video systems. Moreover, two-dimensional (2D) filters require long delay lines, which are not easily implementable in the analog domain. Therefore, new design solutions must be developed, such as the architecture based on analog random-access memories for 2D video-rate switched-capacitor finite-impulse response (FIR) filters, proposed in this work. This structure can be optimized with respect to area requirements and precision requirements, because it allows the exploiting of impulse-response symmetries of linear-phase FIR fitters. The characteristics and the feasibility of the proposed design solution are demonstrated in the design of a 2D low-pass filter for picture-in-picture resizin
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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