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This letter proposes a new concurrent CMOS voltage-controlled oscillator (VCO). The oscillator consists of two sub-VCO operates at 4GHz and 6GHz respectively. The two sub-VCOs are coupled by a pair of MIM capacitors. The proposed oscillator has been implemented with the TSMC 0.18μm BiCMOS technology. By controlling the supply voltages, the VCO has three different operational modes, capable of generating...
This letter presents a lower power and wide locking range divide-by-2 with capacitive cross-coupled injection-locked frequency divider (ILFD) implemented in the TSMC standard 0.18 μm CMOS process. The ILFD is based on a capacitive cross-coupled VCO with one injection MOSFET for coupling the external signal to the resonator. The ILFD uses one 3-dimensional inductors to reduce the die area. At the supply...
In this paper a 12bit 10GSps current-steering digital-to-analog converter (DAC) in 280GHz fT 0.7um InP HBT technology is presented. The DAC core works in a double-sampling way, which reduces the maximum clock frequency by half. The double-sampling switch is separated to reduce the inter-symbol-interference. An improved current steer switch architecture is adopted to enhance high frequency dynamic...
This paper presents an effective design solution for a high-sensitivity current-shunt monitor which operates with an independent supply voltage from 5 to 16 V and achieves a wide input common-mode voltage range from −16 to 60 V. The proposed current-shunt monitor adopts two amplifiers, a current source and several resistors to constitute a feedback circuit and successfully sense drops across shunt...
In order to study the influence of vertical grounding electrode on impulse grounding resistance of substation ground network, the grounding model was built in COMSOL, and the impulse grounding resistances of substation grounding grid in different distribution, length and quantity of vertical grounding electrode were simulated and calculated. The results show that the closer the vertical ground to...
This paper presents a low-power all-digital first-order single-bit delta-sigma time-to-digital converter (TDC) with a differential bi-directional gated delay line time integrator. The differential time integrator features low power consumption accredited to the use of only one bi-directional gated delay line in performing time integration, full compatibility with technology scaling, rapid time integration,...
Presents a low offset current sensing circuit based on switched-capacitor, in which resistance sensing technique is used. Under the control of clock switch, the switched-capacitor integrator could feed the operational amplifier offset voltage back to major circuit as a negative feedback regulator periodically to reduce the influence from the offset to the output. It is shown in the HSPICE simulation...
In order to work out the accident caused by the impact or frequent current into the ground on person or equipment near the substation when transmission line tower is short-circuited, the technology of multi-point monitoring to scattered current in the ground were studied in this paper. And then the method is verified by simulation and experiment. At the same time, the scattered current of not monitored...
Lightning is an important factor in the biosafety of the surrounding area of the tower, and its core lies in the dispersed current damage. Lightning current flows into the earth, resulting in the imbalance of current, the unbalance of current leads to the unbalance of the voltage around the tower. Aiming at the problem of lack of soil dispersed current test and safety assessment, the experiment of...
In order to solve the safety problem about person and equipment caused by the dispersed current during the transmission tower being lightning struck, it is necessary to study the characteristics of the dispersed current. In this paper, the dispersed current model of the tower grounding device is established in COMSOL. The distribution of the dispersed current around the tower is discussed, and the...
Modular multiplication, addition, and subtraction being the core operation of Elliptic curve public(ECC) system, the decrease of area and the merging of structure have been a hot topic in recent years. This paper first analyzes the difference between multiplication type and addition type of modular multiplier. Then, Combined with the structural characteristics of the modular adder, and mixing modular...
In this paper, on-wafer de-embedding methods for passive components are evaluated for millimeter wave integrated circuit (MMW IC) design support. An electromagnetic simulation aided de-embedding (EMSAD) technique is proposed. The electromagnetic model is calibrated by matching the open-short de-embedded measurement at relatively lower frequencies. A set of Ground Coplanar Waveguide (GCPW) test structures...
In this paper, it introduces some new developments of several new LTCC microwave stereo integrated circuits, including: X-band ultra wideband balun, ultra wideband 3dB orthogonal directional couple, a new bandpass filter with highly steep band, ultra-wideband and palanar magtic T, bandpass filter with double transmission zeros, quintuple-mode dual-band filter, ultra broadband vivaldi antenna with...
In whole system, the user usually only offers a voltage with noise as input logic voltage to digital receiver, to guarantee the right logic control, it requires that the IC chip must have a stable inversion level with logic high and logic low input voltage. For COMS process, in traditional design scheme, it usually uses a normal digital inverter as input-unit schematic, and changes the width or length...
This paper proposes an asynchronous cycle circuit by providing Click element and joint module rather than clock-domain. The asynchronous mode of operation re-uses the simple asynchronous control protocols, takes full advantage of characteristics of Click, and commendably inherits the elasticity of the asynchronous micropipeline. The circuit in this paper has some individual coin. As a result, we can...
This paper presents a partition level floorplan method for physical design of digital integrated circuit, which based on data flow analysis. It uses Cadence company P&R tool innovus to make floorplan, and takes a X86 CPU's south bridge design for example to introduce how to use this method to guide floorplan in detail. This method is more effective to improve the quality of floorplan for advanced...
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