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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...
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...
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...
We present a CMOS differential neural amplifier with high input impedance, which topology is inspired by the instrumentation amplifier. The miniaturization of the MEAs goes with an increase of the electrodes impedance and necessitates high input impedance neural amplifiers; otherwise it results in a significant loss of signal and low SNR. The circuit presented here is designed on a 0.35 μm CMOS technology...
A novel integration structure of EMI filter based on multilayer ceramic is proposed in this paper. The inductors and capacitors of the new structure can be designed separately, which is advantageous to manufacture. Besides, the Insertion Loss(IL) is usually measured under the condition of the source impedance and load impedance are both 50Ω, which is different from the actual situation. In the process...
The output voltages at parallel simultaneous switching output (SSO) channels are affected by impedance of power distribution network (PDN) and SSO patterns. In this paper, a target impedance for PDN is directly extracted from the allowable signal output variations due to the SSO patterns.
In the design of high complexity systems, the significance of signal integrity plays a vital role and in turn depends on the occurrence of different noises such as crosstalk noise, reflection noise, switching noises and active periodic noise. These noises are more in the design of IC, PCB layout design and multilayered PCB. However the impact of Simultaneous Switching Noise (SSN) noises in a IC with...
Power supply noise is a serious issue for advanced CMOS LSIs and systems, since the performance of LSI chip is becoming more sensitive to power supply fluctuation under the lower power supply voltage. Because power supply noises are strongly related to the anti-resonance peak frequency in the total power distribution network (PDN), suppressing the anti-resonance peak is one of the most important design...
Power loss at the output stage of conventional constant current neural stimulators is notably high. This is particularly disadvantageous for applications in implantable systems where power budget is limited. We present a novel electrical stimulator architecture for significantly reduced power loss and low noise operation. The system generates a calibrated output voltage profile for driving electrode...
This paper presents a biopotential analog front-end (AFE) IC for measuring electroencephalogram (EEG). The AFE is based on the AC-coupled chopper stabilized instrumentation amplifier architecture to achieve the low noise. To increase the input impedance, the capacitive input impedance boosting loop (CIIBL) is proposed. The CIIBL forms a positive feedback loop between input and output of the instrumentation...
Power supply noise generated by integrated circuits is one of the major sources of EM radiation from PCBs. The reduction of power supply noise can be realized by means of devices that bypass the current among power supply planes, such as bypass capacitors, ground vias and so on. In a previous work the effect of current bypass devices on the far field radiation from multilayer PCBs was very efficiently...
This paper investigates and compares eight most frequently used edge radiation suppression methods. Optimization and improvement for each method are discussed to achieve better radiation suppression performance. In addition, many helpful design guidelines are obtained through a comprehensive comparison of these methods, to guide better EMC design for PCB. Base on this work, one can get a good guideline...
As data rate of serial interface has increased dramatically, timing margin has gotten tighter and tighter. Supply voltage has also kept deducing according to silicon process technology. However, supply noise is hardly reduced due to higher data rate, a huge number of transistors and slower improvement of packaging technology. Therefore, the jitter due to supply noise can be quite large compared to...
In this paper, an efficient noise isolation technique in mixed-signal systems using semi-lumped element resonators is presented. The resonators act as a filter which can be implemented between the power delivery networks of RF and digital circuits. The power filtering is accomplished due to a short circuit that can be induced between the ground and power planes of the RF domain at the designed resonant...
In this paper, we propose the use of the modified nodal analysis (MNA) method to rederive cavity-mode equation of PCB power-bus structures with discrete capacitors. In some frequency, it shows impedance inaccuracies in the traditional double summation to calculate the transfer impedances for the studied PCB power-bus structures with discrete capacitors. Using our proposed method, we not only achieve...
Decoupling for power rails that demand large current, such as FPGA core, is difficult. The capacitors required for derived solution requires excessive board area for placement and raise system cost significantly. Switcher with high loop Band Width helps reducing the decoupling needs with all the design improvements. In this paper, we proposed a 3-stage behavioral model for switcher to help PCB designer...
A common-mode (CM) active filter was designed in a compact package to suppress CM conducted emission at a switching mode power supply. A very compact structure was implemented in the voltage-sense voltage-compensation feedforward topology. The proposed filter was analyzed, and a prototype was applied to a real switching mode power supply (SMPS) board, demonstrating its usefulness by experiments.
This paper demonstrates possible design approaches for the virtual ground fence, a novel design concept for shielding power plane noise. The basic idea of a virtual ground fence is replacing discrete capacitors with quarter-wave stubs. This allows decoupling of power plane noise in the GHz spectrum. Such noise filtering is critical in a mixed-signal system, where there is switching noise generated...
This paper studies the methodology of power integrity (PI) analysis for high speed printed circuit board (PCB) design. This involves the analysis of AC and DC characteristic of the PCB, and also the loop stability of the switch mode voltage source. Besides this, the best practices of designing a power rail with excellent fidelity are discussed in detail in this paper. The basic theory of operation...
This paper presents a methodology for assessing the impact of critical components in a PWM VSI servo drive on conducted electro-magnetic interference. Conducted emissions at the ac mains input are caused in part by the coupling and leakage of high frequency common-mode currents through complex return paths in the drive system. Common-mode currents are caused by switching of IGBTs at high slew rates...
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