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The paper presents a 24 V chopper offset-stabilized operational amplifier with symmetrical RC notch filters, having a 4–24 V supply range, and being realized using a 0.25 ßm BCD process. The amplifier has a typical offset voltage of 1.2 μV, a minimum PSRR of 128 dB, a minimum CMRR of 120 dB, a minimum open-loop gain of 134dB, a noise PSD of 30 nV/√Hz, 1.8 MHz unity gain bandwidth, and THD + noise...
The paper presents a system that allows the passive reduction of noise and vibration of a three-phase induction machine with a stator damper winding connected to capacitors. This is a simple and effective system for reducing the flux density harmonics of a machine. The theoretical study is based on the equivalent circuit of a machine equipped with the damper winding and the modeling is based on the...
Analog systems, where good and stable supply plays an important role in total system performance, need highly accurate, clean and reliable low dropout linear regulators (LDOs). High performance and low area are also important in voltage reference circuits for achieving smallest cost and best in the industry Analog-to-Digital (A/D) and Digital-to-Analog (D/A) conversion. This paper describes a smart...
The analytical noise model of HgCdTe focal plane array (FPA) pixel based on capacitive transimpedance amplifier (CTIA) is presented. It allows to evaluate the noise-equivalent power (NEP) and input dynamic range (IDR) of short-wavelength infrared HgCdTe FPA. The noise model takes into account the following noise mechanisms: photodiode shot noise due to fluctuations of the radiation flux and dark current,...
This paper presents a new current mode control using charge control concept to improve the performances of the constant on time control. These days, constant on time control is widely used in VR applications for its higher light load efficiency and higher bandwidth design capability. In this constant on time configuration, inductor current ripple based current mode control is very popular in today's...
Behavioral EMI models for the prediction of common-mode (CM) and differential-mode (DM) noise based on Thevenin equivalents were developed earlier for a dc-fed motor-drive system. It was shown that beyond the switching frequency of the drive, the CM noise model behaved like a two-port linear network and could predict changes in the input-side EMI due to any changes in the load-side parameters or vice...
During the dynamic test of high power switching devices, it can be challenging to measure both high speed and low amplitude signals accurately. This paper uses fast response on-die temperature sensing as an example to investigate the electromagnetic interference control of a typical double pulse test (DPT) setup. Three common noise sources are identified: 1) Conductive common-mode noise caused by...
A single-shunt current sensing technique is widely used in industrial system to reduce the cost and mounting space of current sensors in an inverter. In addition, a pulse shift control technique, which maintains the pulse duration and achieves reliable current detection, is used in a single-shunt current sensing system. In this paper, the RMS current on the DC-link capacitor with a pulse shift control...
A compact hybrid open stub EBG structure for broadband power noise suppression is proposed. With an additional lumped component on proper locations of open stub, the proposed EBG structure could offer a wider bandgap to cover the whole associated WLAN bands or an aggregated bandgap ranging from WLAN band to above 10 GHz. A 1-D equivalent circuit model is also developed with validation by full-wave...
A 12-bit 20-MS/s charge redistribution successive approximation register analog-to-digital converter in a 65-nm CMOS technology is presented in this paper. To address the issue of long DAC settling time in bit-conversion, an improved internal clock generator is proposed. In addition, a novel SAR controller is introduced to minimize the critical path and improve the conversion speed. Simulation results...
We discuss the readout of a kind of novel 64-pixel quantum dots photodetector array which has high current gains but low dark currents and thus has high signal to noise ratio. Photocurrent spectrum tests demonstrated that the photodetector shows excellent light absorption from 600nm to 900nm both in room temperature (300K) and liquid nitrogen temperature. High gain-adaptive capacitive trans-impedance...
This paper presents an open loop readout circuit technique for capacitive inertial sensors using a charge balanced and ratiometric approach. The charge balance is achieved through a delta-sigma loop allowing for direct analog-to-digital conversion at comparatively lower power. Techniques for achieving differential implementation, noise and offset cancellation are also discussed in lieu of the limitations...
This paper proposes an active resonant power supply noise cancelling with fast voltage drop sensor using the combination of delay-locked loop (DLL) and vernier time-to-digital converter (TDC). Also, we propose the capacitor selector circuit realizing the active insertion of capacitors in less silicon area. These components enable one clock noise detection with fine resolution. Simulation results show...
This paper explores the benefits and costs of integrating an on-chip DC-DC converter as voltage regulator module for reliable power delivery networks (PDNs). We perform detailed time-domain and frequency analyses on PDNs to assess the impact of on-chip DC-DC converter on PDN impedance and overall supply noise behavior. As results show, the reliability of PDNs depends on the DC-DC converter design...
A global reference-circuit (RC), which means one RC is shared with many sensing circuits (SC), is being considered for high-bandwidth STT-RAMs because of the low power consumption and small area characteristic. However, using the global RC for high-bandwidth STT-RAMs causes a droop effect and coupling noise effect, leading to the significant performance degradation. Thus, the validity of using the...
This paper focuses on the electromagnetic interference (EMI) research and analysis of the MHz switching frequency GaN MOSFET based on the LLC resonant DC-DC converter. In this paper, first, the CM coupling paths are studied to get simplified models. Then the impact of the parasitic capacitors (both the capacitors to the ground and the capacitors in the devices) on the CM current are analyzed. Finally...
This work presents guidelines for the design of an on-chip ramp signal generator for static Built-In Self-Test (BIST) of ADCs. The proposed ramp generator is based on a fully-differential switched-capacitor (SC) integrator conveniently modified to produce a very small integration gain. The main non-idealities affecting the linearity of the generator are discussed on a practical implementation in a...
A common mode EMI reduction technique of a flyback converter using a wire shield is presented. The capacitance model of the flyback transformer is derived and it is used to determine the values of the wire shield turns and compensation capacitor minimizing the noise voltage. The experimental results for an actual adaptor are provided to verify the effectiveness of the proposed method.
A 14b 750MS/s 21.1mW current steering digital-to-analog converter (DAC) is presented, which maintains <-168dBm/Hz noise spectral density beyond the Nyquist frequency to minimize TX leakage in SAW-less FDD LTE. A hybrid wideband R-2R LSB segmentation with an impedance attenuator minimizes glitch noise across process and temperature without requiring accurate scaling of switches and switch drivers...
This paper presents multi-objective optimization of a front-end electronics implemented in multichannel integrated circuit for silicon sensors readout in the Silicon Tracking System in the CBM experiment at the FAIR center. We present the optimization towards low-power (< 8 mW/channel) and low-noise while keeping the channel pitch of 58 μm and minimum number of external components required for...
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