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This paper presents a directly triggered asynchronous successive approximation register (SAR) logic with variable delay unit. With the help of the designed logic, the CDAC can be settled directly by the comparator result that avoids long propagation delay as conventional SAR logic does. Moreover, a variable delay unit is designed which provides more settling time to the last several bits to get more...
This paper deals with a technique to reduce glitches in digital-to-analog converters (DACs) using Gray code input. These DACs are designed using MOSFETs, and their operation with glitch reduction was confirmed with SPICE simulation. It has been believed that good topologies of Gray code input DACs do not exist, but we show here their paradox. We also show with simulation that our Gray code input DACs...
In this paper, we propose a radio frequency lateral double diffused metal oxide semiconductor device with part of stepped buried oxide layer, and establish a model of the surface electric field of the device. From the simulation results, it is concluded that the surface electric field distribution model is basically consistent with the simulation results, and the new peak electric field is obtained...
From the varying threshold voltage of MOSFET caused by the external factor, this paper analyzes the variation tendency of amplifier's gain. It makes clear how the gain of three different amplifiers changes in theoretical. After that, EDA tools are utilized to verify the theoretical calculation. The theoretical and simulation result show that threshold voltage(Vth) is a sensitive parameter of amplifier's...
A novel self-turnoff control circuit for program process of one-time programmable (OTP) cell is proposed. Utilizing the current turnoff technology after the breakdown of OTP cell, it lowers the power consumption efficiently compared with traditional structures without turnoff mechanism. In addition, an additional delay circuit is also attached to the self-turnoff circuit to ensure the complete breakdown...
A new DC cancellation technique for a mixer-first receiver in UHF RFID reader is presented in this paper. A band-pass filter composed of an inductor and a capacitor is proposed to cancel the large DC component caused by the carrier leakage at the output of the passive mixer where the mixer is the input stage of the receiver to achieve a high 1dB compression point. Simulation results indicate that...
To improve the performance of typical first-order bandgap references, a high precision bandgap voltage reference with second-order curvature correction is proposed in this paper. Utilizing a temperature independent current (has nothing to do with the temperature of first order) and a proportional to absolute temperature (PTAT) current, a proportional to the square of temperature (PTAT2) current can...
This paper presents our study on the soft-switching converters with voltage-mode. The switching converters are well-known to obtain high efficiency, but their resonant voltages of the voltage-mode converters go very high. We propose here a soft-switching converter with the clamp circuit in order to reduce the peak voltages. We have investigated the difference of the characteristics with/without the...
As a basic logic unit of integrated circuit, the stability of parameters of inverter have a direct effect on the performance of system. This paper starts from parametric drift of traditional inverter caused by the variation of threshold voltage of MOSFET. Then a new parametric drift-resistant inverter is proposed. This structure utilizes compensation circuit to solve parametric drift such as the decrease...
In order to make the buck converter obtain smaller voltage ripple and higher efficiency at the same time, the pulse skipping width modulation (PSWM) mode in buck converter application is proposed in this paper. This novel controlling mode combines the advantage of pulse skipping modulation (PSM) with improving voltage ripple especially in lighter load and pulse width modulation (PWM) having higher...
A bulk-driven operational transconductance amplifier (OTA), which adopts the chopper stabilization technique to attenuate the flicker noise and offset, is proposed in this paper. Operating in the subthreshold region, the chopped bulk-driven OTA has the abilities to work in low-voltage condition, thus consuming only nanowatt power. The circuit was simulated on UMC 180 nm CMOS process. Simulation results...
A comprehensive simulation analysis method is proposed to improve the bottom select gate (BSG) transistor's Vth distribution by adopting under-channel implant in this work.
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