In this paper, two high-resolution medium-bandwidth single-loop 4th-order single-bit sigma-delta modulators using a feed-forward and a feedback topology respectively are implemented in 0.13μm CMOS technology. The ove...
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In this paper, two high-resolution medium-bandwidth single-loop 4th-order single-bit sigma-delta modulators using a feed-forward and a feedback topology respectively are implemented in 0.13μm CMOS technology. The oversampling ratio is 50 with 312.5kHz input bandwidth, 14.66-bit and 16.62-bit resolution have been reached. The two circuits each consume about 8-mW from a single 1.2V supply voltage. After simulation, under the same circuit conditions, feedback structure gives better performance than feed-forward one. The experiment result could be a useful reference for the topology choice.
This work presents a low-power low-cost CDR design for RapidIO SerDes. The design is based on phase interpolator, which is controlled by a synthesized standard cell digital block. Half-rate architecture is adopted to ...
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This work presents a low-power low-cost CDR design for RapidIO SerDes. The design is based on phase interpolator, which is controlled by a synthesized standard cell digital block. Half-rate architecture is adopted to lessen the problems in routing high speed clocks and reduce power. An improved half rate bang-bang phase detector is presented to assure the stability of the system. Moreover, the paper proposes a simplified control scheme for the phase interpolator to further reduce power and cost. The CDR takes an area of less than 0.05 m m 2 , and post simulation shows that the CDR has a RMS jitter of UI pp /32 (11.4 ps @3.125GBaud) and consumes 9.5 mW at 3.125 GBaud.
In this paper, the effects of nanowire (NW) line-edge roughness (LER) in gate-all-around (GAA) silicon nanowire MOSFETs (SNWTs) are investigated by 3-D statistical simulation in terms of both performance variation and...
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In this paper, the effects of nanowire (NW) line-edge roughness (LER) in gate-all-around (GAA) silicon nanowire MOSFETs (SNWTs) are investigated by 3-D statistical simulation in terms of both performance variation and mean value degradation. A physical model is developed for NW LER induced performance degradation in SNWTs for the first time. The results indicate large performance mean value degradations due to NW LER in SNWTs. However, the LER induced parameter variation is still acceptable. In addition, as the LER correlation length (Λ) scales beyond the gate length, new distribution of performance parameters is observed, which has dual-peaks rather than single in conventional Gaussian distribution. The optimization for NW LER parameters is given for SNWT design as well.
This paper presents a 14-bit digital-to-analog converter (DAC) with pipelined dynamic element matching to eliminate signal-dependent distortions and achieve good linearity at high sampling frequencies. A return-to-zer...
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This paper presents a 14-bit digital-to-analog converter (DAC) with pipelined dynamic element matching to eliminate signal-dependent distortions and achieve good linearity at high sampling frequencies. A return-to-zero output stage is developed to enhance the dynamic linearity and increase the output impedance of current sources. And a novel current source array is employed to eliminate systematic and graded errors. The spurious-free dynamic range is 80.9dB at 312MS/s with a 150MHz input. The DAC is implemented in a 0.13-μm CMOS process, and consumes 48mW at 1.2-V power supply and 312MS/s.
In this paper, several techniques which relax circuit requirements of building blocks are presented to effectively realize wideband high-resolution cascade sigma-delta modulator. Three cascade structures have been pro...
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In this paper, several techniques which relax circuit requirements of building blocks are presented to effectively realize wideband high-resolution cascade sigma-delta modulator. Three cascade structures have been proposed in this paper. First, a MASH 2-2 with feed-forward topology in both stages has been explained to obtain low-distortion property and remove subtraction Second, a flexible SMASH 2-2 has been proposed to choose appropriate coefficients for different requirements. Third, a SMASH 2-2 with feed-forward quantization noise self-coupled structure has been displayed to cancel quantization error of the preceding stage totally. Detailed simulation results and comparisons demonstrate the performance of these topologies.
A novel LDMOS-SCR device for electrostatic discharge protection of power device is presented. The device is able to be fabricated in SOI 40V LDMOS process without any extra mask. Due to the new structure, a proper and...
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ISBN:
(纸本)9781424457977
A novel LDMOS-SCR device for electrostatic discharge protection of power device is presented. The device is able to be fabricated in SOI 40V LDMOS process without any extra mask. Due to the new structure, a proper and controllable triggering voltage and fine heat dissipation capability are achieved.
This paper presents a predictive electrostatic capacitance and resistance compact model of multiple gate MOSFET with cylindrical conducting channels, taking into account parasitic effects, quantum confinement and quas...
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ISBN:
(纸本)9781424457977
This paper presents a predictive electrostatic capacitance and resistance compact model of multiple gate MOSFET with cylindrical conducting channels, taking into account parasitic effects, quantum confinement and quasi-ballistic effects. The model incorporates the dependence of channel length, gate height and width, gate-to-contact spacing, nanowire size, multiple channels, as well as 1-D ultra-narrow source/drain extension (SDE) doping profile. The proposed non-iterative electrostatic model is successfully verified, and can be used to predict nanowire-based circuit performance. Based on the analytical model, we can further examine which parasitic components are affecting the delay. Results revealed that Qside. Cof, Rsd RQ are dominant factors and should be treated as a major design concern. Among all the parameters, Lsd Tg and Ndop are essentially important in parasitic design optimization. By selectively modifying these parameters, parasitic effect is evidently reduced.
In this paper, the impacts of diameter-dependent annealing (DDA) effect on nanowire S/D extension random dopant fluctuations (SDE-RDF) in silicon nanowire MOSFETs (SNWTs) are investigated, in terms of electrostatic pr...
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ISBN:
(纸本)9781424457977
In this paper, the impacts of diameter-dependent annealing (DDA) effect on nanowire S/D extension random dopant fluctuations (SDE-RDF) in silicon nanowire MOSFETs (SNWTs) are investigated, in terms of electrostatic properties, source/drain series resistance (RSD), and driving current. The SDE-RDF induced variations of threshold voltage (Vth) and DIBL in SNWTs with different diameters are found to be modest and decrease as the diameters down-scale. However, SDE-RDF induced RSd variation in SNWTs is enhanced by abnormal DDA effects, which aggravates the drive current variations with the downscaling of SNWT diameter. The results also show that Vth is the dominant factor in ON/OFF current ratio variation while RSd dominates that of ON current. The tradeoff between RSd and Vth dominant current variations is discussed to give some guidelines for SDE-RDF-aware design in SNWTs.
Voltage pulse dependent resistive switching behavior during SET process in HfO2-based RRAM device is investigated. When a resistor is connected in series to RRAM during the SET process, the resistance uniformity can b...
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Voltage pulse dependent resistive switching behavior during SET process in HfO2-based RRAM device is investigated. When a resistor is connected in series to RRAM during the SET process, the resistance uniformity can be improved. Voltage pulse controlled resistance states were observed. This behavior may provide the new application with the new function circuits.
A CMOS ASIC has been designed and implemented for readout and control of MEMS vibratory gyroscopes. A low noise design is achieved by using the technique of sinusoidal chopper stabilization with a chopping frequency o...
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