scholarly journals A Capacitive Feedback Transimpedance Amplifier with a DC Feedback Loop Using a Transistor for High DC Dynamic Range

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4716
Author(s):  
Jung-hoon Noh
Keyword(s):  
Feedback Loop ◽  
Thermal Noise ◽  
Dynamic Range ◽  
System Stability ◽  
Design Parameters ◽  
Transimpedance Amplifier ◽  
Simple Method ◽  
Noise Current ◽  
Dc Component ◽  
Capacitive Feedback

This study proposes a capacitive feedback transimpedance amplifier (CF-TIA) using a transistor in the direct current (DC) feedback loop for high DC dynamic range. In some applications, the background DC input can vary widely from the minimum to the maximum, and TIA have to sense the target signal even on the top of the maximum DC input. In a conventional CF-TIA, however, the allowable DC input is constrained by the value of the resistor in the DC feedback loop. To allow a fairly high DC input, the resistor is set to a very low value. This causes the thermal noise current to increase significantly. The increased thermal noise is always present even in the minimum DC input, thus degrading the overall noise performance. The circuit proposed herein overcomes this shortcoming by using the transistor instead of the resistor. The adverse effect of the parasitic capacitance of the transistor on system stability is compensated for as well. Then, the analyses of the overall frequency response and design parameters, including the cut-off frequency and attenuation ratio associated with system stability, are presented for the proposed circuit. In addition, in order to cope with the problem that stability is dependent on the amount of DC input, a simple method for ensuring system stability regardless of DC component value is introduced. The presented analyses and the method are generalized for all CF-TIA applications.

scholarly journals A 4 GHz Single-to-Differential Cross-Coupled Variable-Gain Transimpedance Amplifier for Optical Communication

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 3042
Author(s):  
Samuel B. S. Lee ◽  
Kiat Seng Yeo
Keyword(s):  
Optical Communication ◽  
Dynamic Range ◽  
Visible Light Communication ◽  
Cmos Process ◽  
Transimpedance Amplifier ◽  
Bandwidth Enhancement ◽  
Variable Gain ◽  
Noise Current ◽  
Dc Power ◽  
Capacitive Load

This letter presents an inductorless transimpedance amplifier (TIA) for visible light communication, using the UMC 40 nm CMOS process. It consists of a single-to-differential input stage with a modified cross-coupled regulated cascode design, followed by a modified fT-doubler mid-stage with a combined active inductor and capacitive degeneration design for bandwidth-enhancement and differential output. The mid-stage also has an attached common-mode feedback (CMFB) circuit. Both the input and mid-stages have gain-varying and peaking-varying functions. It has a measured gain range of 37.5–58.7 dBΩ and 4.15 GHz bandwidth using a 0.5 pF capacitive load. The gain range results in an input dynamic range of 33.2 µA–1.46 mA. Its input referred noise current is 10.7 pA/Hz, core DC power consumption is 7.84 mW from a VDDTIA of 1.6 V and core area is 39 µm × 26 µm.

Decentralized Adaptive Control of a Directly Driven Hydraulic Manipulator: Part 1: Theory

1995 ◽  
Vol 209 (3) ◽  
pp. 191-196 ◽  
Author(s):  
K A Edge ◽  
F Gomes de Almeida
Keyword(s):  
Adaptive Control ◽  
Variable Structure ◽  
System Stability ◽  
Design Parameters ◽  
Variable Structure Systems ◽  
Model Following ◽  
Reference Type ◽  
Control Objective ◽  
Manipulator Design ◽  
Following Error

A new approach to adaptive control of manipulators is presented in this paper. The proposed controller for each individual axis is of the model reference type, designed through the use of variable structure systems theory. A novel feature of the controller is the introduction of a series-parallel model of the model-following error. The use of this model ensures system stability even if the manipulator design parameters or payload bounds are exceeded. Chattering of the system, associated with variable structure systems, is eliminated by arranging for the control objective to be physically achievable.

scholarly journals An improved AC-amplifier for electrophysiology

2009 ◽  
Vol 19 (1) ◽  
pp. 7-12
Author(s):  
Nikola Jorgovanovic ◽  
Dubravka Bojanic ◽  
Vojin Ilic ◽  
Darko Stanisic
Keyword(s):  
Dynamic Range ◽  
Cutoff Frequency ◽  
Instrumentation Amplifier ◽  
Single Chip ◽  
Common Mode ◽  
Differential Signal ◽  
Op Amp ◽  
Chip Technology ◽  
The Common ◽  
Dc Component

We present the design, simulation and test results of a new AC amplifier for electrophysiological measurements based on a three op-amp instrumentation amplifier (IA). The design target was to increase the common mode rejection ratio (CMRR), thereby improving the quality of the recorded physiological signals in a noisy environment. The new amplifier actively suppresses the DC component of the differential signal and actively reduces the common mode signal in the first stage of the IA. These functions increase the dynamic range of the amplifier's first stage of the differential signal. The next step was the realization of the amplifier in a single chip technology. The design and tests of the new AC amplifier with a differential gain of 79.2 dB, a CMRR of 130 dB at 50 Hz, a high-pass cutoff frequency at 0.01 Hz and common mode reduction in the first stage of the 49.8 dB are presented in this paper.

Optimization by parameter-perturbation correlation

SIMULATION ◽  
1968 ◽  
Vol 11 (2) ◽  
pp. 57-60
Author(s):  
Robert Gonzalez ◽  
Milo Muterspaugh
Keyword(s):  
Analog Computer ◽  
Steepest Descent ◽  
Design Parameters ◽  
Model Matching ◽  
State Variables ◽  
Parameter Perturbation ◽  
Simple Method ◽  
Matching Problems ◽  
Functional Value ◽  
Term Paper

This paper describes a simple method of steepest-descent optimization of a criterion functional F(α1, α2,...) depend ing on the state variables y i(t;α1,α2,...) of a dynamic system with design parameters α 1, α 2.... The system is simulated on a fast analog computer and the parameters are given mutually orthogonal sequences of binary pertur bations during successive computer runs. Simple correla tion of each parameter perturbation with the criterion functional value at the end of each computer run yields ap proximations for the gradient components ∂ F/∂α k needed for steepest-descent optimization with a minimum- of dig ital logic. As an example, two- and three-parameter model- matching problems are solved by iterative computation at 1000 iterations per second. A course term-paper for first-year graduate students

Reducing Design Margins by Adaptive Compensation for Thermal and Aging Variations

2012 ◽  
pp. 201-230
Author(s):  
Zhenyu Qi ◽  
Yan Zhang ◽  
Mircea Stan
Keyword(s):  
Design Parameters ◽  
Worst Case Analysis ◽  
Transimpedance Amplifier ◽  
Large Area ◽  
Negative Bias Temperature Instability ◽  
Worst Case ◽  
Adaptive Computation ◽  
Bias Temperature Instability ◽  
Computation Efficiency ◽  
On Chip

Corner-based design and verification are based on worst-case analysis, thus introducing over-pessimism and large area and power overhead and leading to unnecessary energy consumption. Typical case-based design and verification maximize energy efficiency through design margins reduction and adaptive computation, thus helping achieve sustainable computing. Dynamically adapting to manufacturing, environmental, and usage variations is the key to shaving unnecessary design margins, which requires on-chip modules that can sense and configure design parameters both globally and locally to maximize computation efficiency, and maintain this efficiency over the lifetime of the system. This chapter presents an adaptive threshold compensation scheme using a transimpedance amplifier and adaptive body biasing to overcome the effects of temperature variation, reliability degradation, and process variation. The effectiveness and versatility of the scheme are demonstrated with two example applications, one as a temperature aware design to maintain IONto IOFFcurrent ratio, the other as a reliability sensor for NBTI (Negative Bias Temperature Instability).

scholarly journals Simultaneous Determination of Glycyrrhizin and 15 Flavonoids in Licorice and Blood by High Performance Liquid Chromatography with Ultraviolet Detector

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yongqian Zhang ◽  
Jin Cao ◽  
Yingping Wang ◽  
Shengyuan Xiao
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Rat Plasma ◽  
Simple Method ◽  
Ultraviolet Detector ◽  
Different Types ◽  
High Dynamic

Licorice is the most frequently used herb in traditional Chinese medicine (TCM) with versatile functions. It is also a popular natural dietary supplement. While the dosages is very important for there are some side effects caused by licorice. The composition of licorice, its products should be well determined thereof. A simple method for simultaneous determining sixteen compounds in vary high dynamic range of content has been established. This method based on the detection at the characteristic ultraviolet spectra of different types of compounds in licorice. Glycyrrhizin and fifteen flavonoids were well measured. All of these compounds can be precisely quantified at their characteristic wavelengths. This method has been successfully applied to the analyses of different licorices, Sini Tang decoction, and rat plasma after oral administration of Sini Tang decoction. These compounds were found to be over 3000 times in content (from 0.01 μg/g to 34.5 μg/g) in some samples.

Estimation of Critical Value of Friction Coefficient for Brake Squeal Analysis

2005 ◽  
Author(s):  
Jinchun Huang ◽  
Charles M. Krousgrill ◽  
Anil K. Bajaj
Keyword(s):  
Friction Coefficient ◽  
Expansion Method ◽  
Critical Value ◽  
System Stability ◽  
Design Parameters ◽  
Complex Eigenvalue ◽  
Brake Squeal ◽  
Modal Expansion ◽  
Eigenvalue And Eigenvector ◽  
Brake Noise

Automotive brake squeal which is generated during brake application has become a major concern in automotive industry. Warranty costs for brake noise have been greatly increasing in recent years. Brake noise and vibration control are important for the improvement of vehicle quietness and passenger comfort. In this work, the mode coupling instability mechanism is discussed, and a method to estimate the critical value of friction coefficient is presented to predict the onset of brake squeal. A modal expansion method is developed to calculate eigenvalue and eigenvector sensitivities. Different types of mode couplings and their relationships with squeal are discussed. A reduced-order characteristic equation method based on the statically coupled eigenvalues and their derivatives is presented to estimate the critical value of friction coefficient. The significance of this method is that the critical value of friction coefficient can be predicted accurately without the need for a full complex eigenvalue analysis, making it possible to determine the sensitivity of system stability with respect to design parameters directly.

scholarly journals State-of-the-art VLBI imaging: 3C345

1991 ◽  
Vol 131 ◽  
pp. 354-357
Author(s):  
Ann E. Wehrle ◽  
Stephen C. Unwin
Keyword(s):  
Thermal Noise ◽  
Dynamic Range ◽  
State Of The Art ◽  
High Dynamic Range ◽  
Instrumental Effects ◽  
High Dynamic ◽  
Low Dynamic Range ◽  
Very High

AbstractMost VLBI images have low dynamic range because they are limited by instrumental effects such as calibration errors and poor u, v-coverage. We outline the method used to make a new image of the bright quasar 3C345 which has very high dynamic range (peak-to-noise of 5000:1) and which is limited by the thermal noise, not instrumental errors. Both the Caltech VLBI package and the NRAO AIPS package were required to manipulate the data.

scholarly journals Wide dynamic range transimpedance amplifier IC for 100-G DP-QPSK optical links using 1-^|^micro;m InP HBTs

2012 ◽  
Vol 9 (12) ◽  
pp. 1012-1017 ◽  
Author(s):  
Kimikazu Sano ◽  
Hiroyuki Fukuyama ◽  
Makoto Nakamura ◽  
Miwa Mutoh ◽  
Hideyuki Nosaka ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Transimpedance Amplifier ◽  
Wide Dynamic Range ◽  
Optical Links
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