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A low-voltage differential signaling (LVDS) driver with 3-bit programmable slew-rate control has been designed and fabricated in 0.13um complementary metal oxide semiconductor (CMOS) process. On-chip programmable capacitors allow cost saving compared to external capacitors and fine tuning to driver output slew-rate. This enables system designers with the flexibility to optimize driver slew-rate for...
We have developed Silicon Drift Detector (SDD) based X-ray spectrometer for the future planetary/space exploration missions. This spectrometer provides the energy resolution of ∼150 eV at 5.9 keV for the pulse peaking time of 3 μs and the detector kept at −40°C. The energy resolution of the SDD based X-ray spectrometer depends on the detector leakage current and the electronics noise associated with...
GPU for high performance computing shows high current consumption and fast current variation which presents a big design challenge for power delivery. In this paper, power delivery design for a computing GPU is discussed focusing on package capacitors. Current behaviour of a computing application is illustrated first. The related power delivery challenge is presented with simulation and measurement...
The key to designing power distribution network (PDN) is to obtain correct current drawn by integrated circuits (IC). This paper suggests an exact IC current extraction method using a measured voltage of a board and new transfer function which reflects the effects of the scope's noise. Voltage waveform is measured at the location where the closest decoupling capacitor from an IC would be removed in...
An emulated multi-path PID compensator for buck converter with a large step-down ratio for application to a LCD TV is presented. The emulated multi-path PID compensator is adopted in order to avoid output noise and achieve fast transient characteristics. Furthermore, the proposed buck converter with the large amplitude of its sawtooth waveform is robust to noise such as ground bouncing voltage. The...
This paper provides an area-efficient, low power and high precision current-to-voltage integrator for photocurrent measuring by using correlated double sampling. A novel CDS scheme is devised by using an interstage capacitor instead of the large error store capacitor to reduce kT/C noise. An integrator prototype with the proposed technique is fabricated using 0.8-µm 2P2M CMOS process for demonstration...
We have seen in EMI tests that adding additional turns to an EMI choke of a low pass filter actually worsens the conducted emissions. The reason for this is explained and demonstrated by analysis and by Pspice modeling of the EMI filter circuit and components. It is also demonstrated that the damping resistance of the EMI filter plays a very important role in EMI conducted emissions.
This paper presents a measurement-based data-processing approach to obtain parameters of multiple current components through a bulk decoupling capacitor for power integrity studies. A lab-made low-cost current probe is developed to measure the induced voltage due to the time-varying switching current. Then, a post data-processing procedure is introduced to separate and obtain the parameters of multiple...
DC leakage currents of MLCC (Multi Layerd Ceramc Capacitor)s show the typical Poole Frenkel relationship between the normalized current log (I/V) and the normalized voltage V within the specified voltage across the device without any local breakdown characteristics, giving the PF constants and the barrier heights of the insulating BaTiO3 layers. The typical 1/f noise characteristics are also observed,...
SiC-JFET based inverters can achieve very fast switching, hence reducing the commutation losses, at the cost of increased Electro-Magnetic Interferences (EMI). To keep the EMI conducted emissions within reasonable limits, we propose to integrate some small-values capacitors directly into the power module. Common Mode (CM) is investigated and compared with a standard configuration. The high frequency...
A high precision low dropout regulator (LDO) with nested feedback loops is proposed in this paper. By nesting a zero-tracking compensation loop inside of the negative feedback loop comprising an Error Amplifier, the independence of off-chip capacitor and ESR is ensured for different load currents and operating voltages. Therefore, in low Iddq or low voltage scenarios, the total error of the output...
This paper presents a low-power high-resolution CMOS interface for capacitive sensors. The circuit is based on the use of a switched-capacitor charge amplifier, which converts the input capacitance to a voltage, which modulates the period of a relaxation oscillator. Auto-calibration is used to eliminate the undesired effects of transfer-parameter drift. The interface is suited for capacitive sensors...
An extremely sensitive vibrating reed electrometer is built, that is able to reach sub-aA current resolution within a one-minute measurement. The input leakage current of the set-up is -0.12 aA, that is less than 1 electron per second. Crucial for this extreme sensitivity and low leakage current is the development of an input stage with only vacuum gap capacitors. The stability and sensitivity of...
We present a novel technique to generate an accurate dc current in the pA range. This source works by the charging of a capacitor using a voltage ramp with a precisely controlled slope. We generate this ramp with a precalculated Δ-Σ modulation sequence. The accuracy is limited by the voltage stability of the arbitrary wave generator used to generate the pattern.
A digital background correction technique combined with data weighted averaging (DWA) algorithm is presented to overcome the digital-to-analog converters (DACs) unit element mismatch errors in multibit sigma-delta modulators (ΣΔMs). This technique needs a background measurement process. The circuit-level simulation results confirm the validity of the measurement process and the system-level simulation...
In this paper, we report on the noise analysis of low current measurement systems for biomedical applications. We analyzed resistive feedback, capacitive feedback and current conveyor circuits for low current measurement systems. Detailed noise analysis are presented and matched with measurement data using a 0.5-μm fabrication process. Based on the theoretical analysis and the measurements, the capacitive...
This paper proposes a method for modeling chip-package resonance using impulse response. To extract chip and package electrical circuit parameters, we assume a circuit equivalent to the loop from the chip to the package decoupling capacitor as the RL-RC parallel circuit and convert it into an RLC parallel circuit. We apply this method to devise an electrical circuit model capable of expressing chip-package...
Electro-statically driven micro-mechanical structures are an interesting and frequently used category of MEMS elements. Investigation of their properties is important both for better understanding the device operation and for fault detection and diagnosis. To follow the movement of micro-parts in such elements involves difficulties since device packages inhibit looking into the chip. Our motivation...
A 2.5 V second order RF bandpass filter is presented. A new Q-enhancement structure stacked on a LNA is fabricated in a 65-nm CMOS process with a die area of 1.1 mm ?? 1.1 mm. The frequency range is adjustable in a 25% range from 1.7 GHz to 2.2 GHz while the Q is adjustable up to 50. Q and the center frequency are adjusted by binary weighted switchable capacitors. The filter draws 42 mA including...
Multilevel converters have emerged as a promising alternative to traditional two level converters, especially flying capacitor converters because of the fact that this topology requires only a main DC-link voltage and presents a easy way to increase the output voltage levels by increasing the number of cells. Unfortunately, a balancing of capacitor voltage is required. Recently, predictive control...
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