High‐resolution common‐depth‐point reflection profiling:Field acquisition parameter design

Geophysics ◽  
1986 ◽  
Vol 51 (2) ◽  
pp. 283-294 ◽  
Author(s):  
Ralph W. Knapp ◽  
Don W. Steeples
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Spectral Response ◽  
Seismic Energy ◽  
Energy Sources ◽  
Spectral Character ◽  
Analog To Digital ◽  
Field Recording ◽  
Analog To Digital Conversion ◽  
Point Reflection

The results of a seismic reflection profiling exercise are strongly dependent upon parameters used in field recording. The choice of parameters is determined by objectives of the survey, available resources, and geologic locality. Some simple modeling and/or a walkaway noise survey are helpful in choice of field parameters. Filtering data before analog‐to‐digital conversion in the field can help overcome limitations in the dynamic range of the seismograph. Source and geophone arrays can be used to a limited extent in high‐resolution surveys to help attenuate ground roll. Proper planting of geophones can be an important factor in obtaining the flattest spectral response. Various seismic energy sources provide the flattest spectral response. Various seismic energy sources provide different spectral character and varying degrees of convenience and cost.

Optically assisted high-speed, high resolution analog-to-digital conversion (Invited Paper)

2005 ◽  
Author(s):  
Henry Zmuda ◽  
Shane Hanna ◽  
R. J. Bussjager ◽  
M. L. Fanto ◽  
M. J. Hayduk ◽  
...  
Keyword(s):  
High Resolution ◽  
High Speed ◽  
Digital Conversion ◽  
Analog To Digital ◽  
Analog To Digital Conversion

scholarly journals A precision low-frequency Analog-to-Digital converter for advanced systems of technical diagnostics and nondestructive testing

2020 ◽  
pp. 6-16
Author(s):  
N. A. Lukin ◽  
◽  
L. S. Rubin ◽  
Keyword(s):  
Dynamic Range ◽  
Low Frequency ◽  
High Sensitivity ◽  
Technical Diagnostics ◽  
Digital Conversion ◽  
Wide Dynamic Range ◽  
Voltage Level ◽  
Analog To Digital ◽  
Analog To Digital Conversion ◽  
Nonlinear Analog

The main results of the development of a precision low-current meter based on a nonlinear ADC are presented. It is shown that the application of the method of nonlinear analog-to-digital conversion and a controlled voltage level at the non-inverting input of an integrating operational amplifier allows both high sensitivity and a wide dynamic range with a small spread of output codes. The use of the laboratory sample of the meter for cyclic tensile testing of steel specimens is described.

scholarly journals CMOS Digital Pixel Sensors With In-Pixel Analog-To-Digital Conversion

2021 ◽  
Author(s):  
Yong Chen
Keyword(s):  
Frequency Modulation ◽  
Dynamic Range ◽  
Pulse Frequency ◽  
Reference Voltage ◽  
Pulse Frequency Modulation ◽  
Digital Conversion ◽  
Analog To Digital ◽  
Analog To Digital Conversion ◽  
Pixel Sensors ◽  
Digital Pixel

This thesis deals with the designing of CMOS image sensors with in-pixel analog-to-digital conversion. A 2-stage memory write scheme for Pulse-Width-Modulation digital pixel sensors is proposed. It utilizes the characteristics of Gray-code counters and partitions a single data write operation into two separated write operations such that the size of the in-pixel memory can be significantly reduced. A Pulse-Frequency-Modulation pixel significantly reduces the integration time without sacrificing the dynamic range. Finally, a Pulse-Frequency-Modulation Digital Pixel Sensor with an in-pixel variable reference voltage is proposed. As compared with conventional Pulse-Frequency-Modulation pixels, the proposed architecture improves the dynamic range by adaptively adjusting the reference voltage in the pixel. All proposed digital pixel sensors are designed in TSMC-0.18μm 6-Metal 1-Poly 1.8 V CMOS technology and analyzed using Spectre from Cadence Design Systems with BSIM3V3 device models. The effectiveness of the proposed digital pixel sensors is validated using simultation.

scholarly journals Analog-to-digital conversion that allows to increase the dynamic range a standard ADC using the properties of electrical signals

2018 ◽  
Vol 245 ◽  
pp. 10003
Author(s):  
Stanislav Gritsutenko
Keyword(s):  
Dynamic Range ◽  
Linear Equations ◽  
Railway Transport ◽  
System Of Linear Equations ◽  
Digital Conversion ◽  
Analog To Digital ◽  
Electrical Signals ◽  
Analog To Digital Conversion ◽  
Low Entropy

A method is proposed to significantly increase the dynamic range of current and voltage meters in the traction networks of railway transport. The method is based on the low entropy of signals of this type and is based on the calculation of samples whose amplitude was distorted due to the output beyond the ADC dynamic range. The approach with the solution of system of linear equations is considered. An approach without solving a system of linear equations is presented. The accuracy of the method is discussed at the end of the article.

Readout Integrated Circuits with Pixel-Level ADC for Ultraviolet FPA Applications

2012 ◽  
Vol 229-231 ◽  
pp. 1499-1502
Author(s):  
Bin Xu ◽  
Yong Gang Yuan ◽  
Ding Ma ◽  
Neng Bin Cai ◽  
Xiang Yang Li
Keyword(s):  
Integrated Circuits ◽  
Dynamic Range ◽  
Cmos Process ◽  
Low Light ◽  
Digital Conversion ◽  
Analog To Digital ◽  
Multiple Channel ◽  
Analog To Digital Conversion ◽  
Pixel Sensors ◽  
Digital Pixel

An array of 128×128 digital pixel sensors (DPS) that performs both in pixel light current integration and analog-to-digital conversion is presented. The pixel fabricated on a DP4M CMOS process provides a digital output of ultraviolet light intensity via an integrated multiple-channel bit-serial (MCBS) ADC. Due to low light current (~pA) of ultraviolet focal-plane-array, the architecture of capacitive trans-impedance amplifier (CTIA) is used. The proposed readout integrated circuits have a 12-bit resolution, 70dB dynamic range and 99% of linearity.

Sign in / Sign up

Export Citation Format

Share Document