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Noise analysis of a widely used switched capacitor unity gain sampler is presented, which in detail shows that the circuit structure can not only get rid of the offset voltage induced by the OTA involved, but also has the ability of suppressing 1/f noise with operation timing of the sampling capacitor, functioning as correlated double sampling in fact, however paying the price of increasing thermal...
An optimization design of an Under Voltage Lockout (UVLO) circuit in a bipolar CMOS DMOS (BCD) process is presented in this paper. Compared with the traditional structure, the proposed circuit effectively reduces the hysteresis voltage drift with temperature by introducing the high-order temperature compensation function to the band-gap reference. Thus, the reliability of the UVLO circuit is improved...
Power consumption is one of the key optimization objectives for modern integrated circuit designs. More than 40% of the total power consumption is contributed by clock trees due to their high frequency of switching and high capacitance. In the traditional physical design flow, placement is done before clock tree synthesis (CTS). CTS constructs a tree to connect the clock source with all the registers...
The cryptographic chip is widely used in government, military, finance, business and other fields, so the requirement of security is very high. The globalization of the integrated circuit supply chains has promoted the rapid development of the industry, but the chip is also vulnerable to malicious modified by the attacker, namely hardware Trojan implanted. The paper proposed a hardware Trojan efficient...
Microsystem technology based on micro machining technology and integrated circuit technology has the advantages of miniaturization, integration, intelligence, low cost, high performance, mass production and so on. An overview of the composition and working principle of the microsystem, it introduces the development history of micro system technology, current situation and industrial distribution pattern,...
An incremental delta-sigma modulator with a self-making capacitor having a high voltage operating ability for a 12-cell battery pack is proposed in this paper. The measured voltage range for each battery is from 0 to 5 V, and the maximum input voltage reaches to 60 V. The self-making capacitor adopting a metal over poly silicon with a relatively thin layer of oxide between the two plates is generated...
We have developed a GaAs-based Blocked-Impurity-Band (BIB) Detector for the application of Terahertz (THz) security check and astronomical observation. In this work, we have fabricated GaAs:Si and GaAs:Te BIB detectors and analyzed their spectral response characteristics at 3.5K The experimental results of GaAs:Si BIB device demonstrate that the spectral response increases when the bias rises from...
The degradation mechanism of 808 nm GaAs-based high-power laser diode bars (LDBs) which has 47 single laser diodes is investigated using infrared thermography, focused ion beam, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy techniques. We obtained the temperature distribution of the output facet and the results indicate that emitter 24, which is located...
This paper presents a low-power adaptive edge decision feedback equalizer (DFE) for 10 giga-bits-per-second (Gbps) serial links with 4 PAM (pulse-amplitude-modulation) signaling. Optimal tap coefficients are obtained adaptively using a sign-sign least-mean-square (SS-LMS) algorithm that minimizes the jitter of equalized data. Low-voltage-differential-signaling (LVDS) tap generators that double DFE...
A new quad band quadrature branch line coupler (BLC) has been presented in this paper. The proposed BLC has been designed with the help of the T shaped coupled line sections, quad band impedance inverter. The BLC has been designed using Advanced Design System (ADS) software for f1 = 0.66 GHz, f2 = 1.52 GHz, f3 = 2.57 GHz and f4 = 3.44 GHz operating frequencies. The Rogers 5870 substrate has been selected...
Synthesis and implementation are two fundamental steps of the hardware design. Mountains of work in this area synthesize and implement your design from Hardware Description Language (HDL) description to the target FPGA device. We present ISE plus Customized P&R, a tool-chain converting Verilog designs into XDL that contains Xilinx FPGA implement modules. A key aspect of this tool-chain is that...
In order to compensate for the effects of supply voltage, process and temperature on the oscillator frequency, we design a ring oscillator with digital calibration. By comparing the frequency deviation between the ring oscillator and the external reference clock source, adjusting the state of the control word, and then changing the number of resistors in the analog circuit to adjust the output frequency...
A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary...
The design and implementation of a K-band fast hopping frequency synthesizer based on DDS and PLL is described. Main technical specifications are as follows: frequency ranges from 24GHz to 27GHz, step frequency is 50MHz and lock time is less than 150ns. The parameters of loop filter and the analyses of phase noise and lock time are provided by MATLAB simulation to verify the feasibility of the design...
A low quiescent current low-dropout regulator (LDO) applied in energy harvest system is presented in this paper. With super-source follower, the LDO has only one pole within loop unity gain bandwidth. And current buffer compensation is utilized to maintain the phase margin under the full range of load current. In order to decrease the power dissipation on the resistors of voltage divider, the resistors...
An OVT based on Mach-Zehnder interferometer is proposed in this paper, which helps to convert the electro-optic phase delay into the displacement of the interference fringe. And then, the voltage applied to the electro-optic crystal is obtained by positioning the displacement of the fringe, and the effectiveness of this method is verified by experiments. The new OVT meets the requirements of 0.5%...
Due to process variations at the very low technology nodes, the manufactured chips are grouped into different speed bins. Currently, various types of maximum operation frequency (Fmax) tests are performed for efficient speed binning by applying complex functional or structural test patterns, which incurs high test cost. In this paper, a novel on-chip Binning Sensor is proposed which can monitor the...
Electrochemical reaction is the reason of smart meters failure under maritime climate coastal southeastern China. In order to ensure the smart meter runs reliable and stable under this kind of environment, the paper researches three anti-technology based on an analysis of the electrochemical reaction principle, combined with the specific circumstances of meter. In this paper, it analysis the core...
There will always have a greater residual stress in the processing process of the micromechanical gyroscopes straight elastic-beam. affecting the performance of micromechanical gyroscopes. According to the principle of stiffness equivalence, the original elastic-beam of the micromechanical gyroscope is improved to the beam of drive as the U-beam and sense as the carb-leg beam by the combination of...
In this work, the device structure of the mesa-type GaAs:Te blocked-impurity-band detector was designed. The fabrication processes were presented briefly, and optimization of the fabrication processes was investigated. A 3-micron-thick SiO2 film was deposited as resist to substitute for photoresist in the 50-micron-deep mesa etching process. In addition, a bi-layer photoresist lithography technique...
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