Home > Instructions > Active feedback improves amplifier phase accuracy systems

Active feedback improves amplifier phase accuracy systems

Takeshi Godai established Onkyo in with the intention of addressing what he felt was a lack of satisfactory Japanese-made dynamic speakers. The first Onkyo-branded product was not in fact a speaker, but a cartridge pickup for record players. The company invested the profit from its crystal pickup sales into speaker research and development and planned to build a factory. At the time, most speakers were made using imported pre-made paper cones. In defiance of convention, Onkyo developed an in-house production method for its own paper cones—and in so doing, formed the origin of our sound story.


We are searching data for your request:

Active feedback improves amplifier phase accuracy systems

Schemes, reference books, datasheets:
Price lists, prices:
Discussions, articles, manuals:
Wait the end of the search in all databases.
Upon completion, a link will appear to access the found materials.
Content:
WATCH RELATED VIDEO: Dr. Duncan French: How to Exercise for Strength Gains \u0026 Hormone Optimization - Huberman Lab #45

US7202805B2 - Amplifier gain calibration system and method - Google Patents


A methodology based on Principal Component Analysis PCA and experimental design has been developed to generate a compact variation-aware timing model for a standard cell in a cell library. The model incorporates variations in the input waveform and loading, process parameters, and the environment into the cell timing model.

Principal Component Analysis is used to form a compact model of a set of waveforms impacted by these sources of variation. Cell characterization involves describing how waveforms are transformed by a cell as a function of the input waveforms, process parameters, and the environment.

The models have been evaluated by calculating the delay of paths. The results demonstrate improved accuracy in comparison with table-based static timing analysis at comparable computational cost.

The supply voltage decrease and power consumption increase of modern ICs made the requirements for low voltage fluctuation caused by packaging and on-chip parasitic impedances more difficult to achieve. Most of the research works on the area assume that all the nodes of the chip are fed at the same voltage, in such a way that the main cause of disturbance or fluctuation is the parasitic impedance of packaging.

In the paper an approach to analyze the effect of high and fast current demands on the on-chip power supply network. First an approach to model the entire network by considering a homogeneous conductive foil is presented.

The modification of the timing parameters of flip-flops caused by spatial voltage drops through the IC surface are also investigated. In this paper the Nexp transistor model is considered as a way of granting the accuracy of results in the characterization of submicron CMOS circuits. The analytical model proposed is valid for a ramp input, and takes into account all the operation regions of the transistor as well the influence of the gate-to-drain capacitance.

An application example considering the use of the model for the evaluation of the delay associated to the CMOS inverter is considered. The validity of the results obtained with analytical model of a 1. In this paper a procedure to measure the energy induced by crosstalk coupling in VLSI circuits is presented.

Due to the high frequency signal components it is not feasible to determine the energy consumption by directly measuring the current and voltage supply. Two approaches based on the measurement of a capacitor discharge are proposed. The methods are validated by electrical simulation and experimental measurement on a specifically designed and implemented in a 0. The converter operates from a 1. The possible configurations are 2-bit, 3-bit, 4-bit resolutions and power down.

The power consumption changes according to the configuration selected from 1. The small ADC core area m x m and the low power consumption enable the integration in a low voltage and low power front-end. Monolithic Active Pixel Sensors MAPS using standard low cost CMOS technology available from industrial manufacturers have demonstrated excellent tracking performances for minimum ionizing particles and biomedical imaging applications.

Fernandes3,4, Manuel Medeiros Silva3,4. The number of comparators is doubled for each additional bit in resolution. However, the cost should be measured by area and power consumption, rather than by the number of circuit elements. In this paper we use comparators with very low area and low power, which have high offset voltage; using Wallace-tree encoding is equivalent to performing comparator reordering, and the resolution is improved without using offset compensation or calibration.

This technique is demonstrated by statistical simulation. As an example, we designed a 6 bit ADC in a 0. A figure-of-merit of 0. This work presents an alternative technique for impedance measurement of cell-cultured systems over micro-electrodes. It is based on preserving the input voltage amplitude at a constant value potentiostat by using a feedback loop configuration.

As consequence, a new method for measuring impedance magnitude and phase without classical demodulation approaches is proposed.

A circuit implementation is proposed and simulation results are provided. The system can be also useful for impedance spectroscopy and 2D tomography. In this paper an application-specific integrated circuit ASIC for the measurement of the real and imaginary part of an impedance is presented. The ASIC includes an interdigitated sensor IDS , a 4 electrode sensor, the impedance measurement circuit, and additional circuitry for powering by an inductive link.

The power consumption was the most important parameter to optimize. The useful frequency range of the circuit goes from 10kHz to kHz when using resistors and capacitors as impedance. In this circuit an alternative interface to avoid the instrumentation amplifier with uncoupling differential DC is used, which allows optimization of area and power consumption.

The ASIC has been designed in a 0. Experimental results to verify its functionality are presented. Highly Accurate Contactless Potentiometers.

New potentiometers for contactless angle detection are presented. They use a magnetoresistive sensor bridge for detection of the direction of the magnetic field generated by a permanent magnet. Three different versions are presented, each one using a different integrated CMOS interface circuit for conditioning of the magnetoresistive sensor signal.

The first interface is very simple and all analog. Measurement results for the three sensor interfaces are provided, and their performance trade-offs discussed. This paper describes an integrated solution for an accurate DNA label-free detection. The sensor considered is capacitive and consists of two golden electrodes. A known DNA strands probe is immobilized over them and a capacitive shift occurs in presence of a complementary sequence inside the solution.

The shift amount has been previously evaluated by means of a charge sensitive amplifier CSA with an active feedback resistance, followed by a comparator and a counter on a prototyping board. Starting from the measurement results an integrated version is presented here using a low-noise CSA to reduce the low-frequency noise and offset. The proposed integrated version of the read-out demonstrates the ability to identify variation on the capacitive values of the sensor with a resolution of 0.

Mutual coupling between spiral inductors is usually a forgotten effect during RFIC design. This paper presents a complete study where mutual coupling between spiral inductors is analyzed.

The coupling in function of the frequency is described and explained, and its dependence with geometrical and electrical parameters is obtained. An electrical model that closely matches EM simulations up to the inductors resonant frequency is presented. Model and simulations are validated against experimental measurements in a test chip implemented in a 0.

The efficacy of some measures to reduce coupling is experimentally quantified. The impact of the layout of integrated inductors on their performance and especially on the quality factor is studied in this work.

The performance of an inductor with a coplanar waveguide CPW ground plane together with a vertical ground shield around the inductor is compared to the performance of an inductor without CPW ground plane. Patterned polysilicon ground shield are also incorporated and their influence is presented. Simulation results are given together with measurements for various layouts with and without polysilicon ground shields and CPW ground planes.

The inductance, series resistance and quality factor of RF CMOS inductor used in differential implementations are derived from a mixed mode differential and common-mode two-port model of the inductor.

The model parameters are extracted in terms of Z-parameters for various load conditions. Both differential and common mode signals are taken into account in the extraction method to account for signal leakage to ground at high frequencies.

Results are compared with published results from existing model parameter extraction methods. This paper presents the design and test of passive components and active circuits broad band amplifier implemented on a low cost SiGe:C BiCMOS technology optimised up to 10GHz to operate up to the lower edge of the millimetre wave band 30GHz. The measurements accuracy at this frequency is strongly dependent on the access pads.

Accordingly, their characterisation based on test structures is presented. Since the available spiral inductors has SRF lower then 30GHz, new inductors were designed, fabricated, tested and modelled for future use. An inductorless broad band amplifier was designed, implemented and tested. Adjacent channel filtering is a common problem in modern communication systems.

The resulting filter is compared with a classical Finite Impulse Response FIR with the same specifications, showing a significant advantage in terms of hardware complexity. Moreover, new stream types can be easily supported. The parser source code has been written in C language and has been optimized to speed up the execution in the target DSP. Digital Video Broadcasting DVB is recently receiving a large attention, as it is being adopted by many countries around the world.

A new standard for handheld terminals called DVB-H has been recently proposed which demands for low power. This paper presents the implementation of a DVB-H receiver in a single chip.

Miguel Casas Sanchez, Jose A. Rizo Morente, Chris Bleakley, J. The effects of different levels of general and specific optimization on the energy and power consumption are measured for this processor.

Finally, Texas Instruments library routines are compared with the compiled versions. The paper provides an analysis of the results together with recommendations for improving performance.

The simulations of this model are faster to compute and very accurate in comparison with the device level simulations. One of the features of this high level description is the use of a macromodel for key components of the converter. Analog macromodels offer a very interesting tradeoff between simulation speed and accuracy.

The methods to extract behavioral parameters of the macromodels from device level simulations are well known and easy to implement. In this paper we use a macromodel to model the transconductance operational amplifier of each stage of the converter and integrate it into the VHDL-AMS description of the circuit. The design goals are first obtained from the system level, and then the possibility of using a ring oscillator is verified.

A differential topology is chosen for the inverter cells in the oscillator, because the jitter caused by common-mode noise is lower. This paper presents a behavioral model to ease the top-down design techniques for folding and interpolating analog-to-digital converters. It takes into account non-idealities in the converter blocks.

This model may be incorporated into a BIST design for on-chip analysis of digital-to-analogue converters. The analysis would consist of comparing the output response of the converter under test with the expected output response of the ideal converter model that is to be discussed. The model and comparison are implemented in hardware and is part of the overall digital circuit design.

The model is also capable of returning diagnostic information regarding the test to an external test arrangement.


Techniques of EMG signal analysis: detection, processing, classification and applications

To improve the current non-linear optically coupled isolation amplifier and high power consumption, we designed a low-power, high-speed and high-linearity BiCMOS optically isolation amplifier. There are only two push-pull output stages configuration bipolar transistor BJT in the design process, the rest of the circuit is the CMOS device. To improve amplifier gain linearity and stability, we introduce the complementary symmetrical photodiode, in the optically coupled part and every amplifier, negative feedback is introduced. Request Permissions. Optical coupling extends isolation-amplifier utility. Electronics, vol.

One of the applications of using positive feedback within an op amp circuit to provide switching, for which comparators provide much better performance as they.

This is how AI bias really happens—and why it’s so hard to fix


A methodology based on Principal Component Analysis PCA and experimental design has been developed to generate a compact variation-aware timing model for a standard cell in a cell library. The model incorporates variations in the input waveform and loading, process parameters, and the environment into the cell timing model. Principal Component Analysis is used to form a compact model of a set of waveforms impacted by these sources of variation. Cell characterization involves describing how waveforms are transformed by a cell as a function of the input waveforms, process parameters, and the environment. The models have been evaluated by calculating the delay of paths. The results demonstrate improved accuracy in comparison with table-based static timing analysis at comparable computational cost. The supply voltage decrease and power consumption increase of modern ICs made the requirements for low voltage fluctuation caused by packaging and on-chip parasitic impedances more difficult to achieve. Most of the research works on the area assume that all the nodes of the chip are fed at the same voltage, in such a way that the main cause of disturbance or fluctuation is the parasitic impedance of packaging. In the paper an approach to analyze the effect of high and fast current demands on the on-chip power supply network. First an approach to model the entire network by considering a homogeneous conductive foil is presented.

Dual AMR motor position sensor for safety-critical applications

active feedback improves amplifier phase accuracy systems

In earlier work, we examined the concept of negative feedback. Here, a portion of the output signal is sent back to the input and summed out of phase with the input signal. The difference between the two signals then, is what is amplified. The result is stability in the circuit response because the large open-loop gain effectively forces the difference signal to be very small. In this case, the combined signal looks just like the output signal.

These op amps operate over a wide supply range from 1.

Active-feedback frequency-compensation technique for low-power multistage amplifiers


Active noise cancellation ANC technology is a staple of the modern headphone industry. However, as our reviews show, not all ANC implementations are equal. In fact, there are quite a few different ways to implement ANC technology, each of which has implications for the quality and type of noise that a headset is good at cancelling out. Sound waves that are degrees out of phase, or the inverse of one another, cancel out when summed together. The anti-noise signal cancels out the actual background noise at the point it reaches your ear.

Top 100 Control Systems Objective Questions & Answers

These technology advancements are also leading the way to the transition to semi- and fully autonomous driving. This trend is leading to the development of more reliable, intelligent, higher-performance and redundant electrical actuator solutions that need to comply with the ISO functional safety standard. This is a risk-based safety standard, where the risk of hazardous operational situations is qualitatively assessed, and safety measures are designed into the components and system to avoid or control systematic failures and detect or control random hardware failures or mitigate their effects. These actuator systems generally use brushless DC BLDC motor drives , and as these systems are safety critical, the designers must design the solution hardware and software such that the system complies with the highest automotive safety integrity level ASIL D. Brushless DC motors , as the name suggests, have no brush contacts, and motor position sensors MPSs are needed to measure the relative position between the stator and rotor to ensure the correct stator coil energising sequence. This is particularly critical at start-up, when there is no back EMF available and it is impossible for the microcontroller to determine the relative rotor and stator positions.

Bias can creep in at many stages of the deep-learning process, the false positive and false negative rates of a prediction system.

SYSTEM ANALYSIS

A home audio system without a good subwoofer is like a rock band without a bass player: It just never sounds right. Even when we pitted it against much more expensive models, it emerged as the top pick in our listening tests, and its measured performance was excellent for a model at this price. We test subwoofers with an expert listening panel, and we conceal the identities of the subwoofers to eliminate bias.

Difference Between Inverting and Non-Inverting Amplifier

RELATED VIDEO: Low Pass Filters and High Pass Filters - RC and RL Circuits

Try out PMC Labs and tell us what you think. Learn More. EMG signals acquired from muscles require advanced methods for detection, decomposition, processing, and classification. The purpose of this paper is to illustrate the various methodologies and algorithms for EMG signal analysis to provide efficient and effective ways of understanding the signal and its nature. We further point up some of the hardware implementations using EMG focusing on applications related to prosthetic hand control, grasp recognition, and human computer interaction. A comparison study is also given to show performance of various EMG signal analysis methods.

Negative feedback amplifiers have an important role in reducing amplitude distortion, frequency distortion, and phase distortion. With feedback, the overall gain of the amplifier becomes.

A High-Speed and High-Linearity BiCMOS Optically Coupled Isolation Amplifier

Op-amp Tutorial Includes: Introduction Op amp gain Bandwidth Op amp slew rate Offset null Input impedance Output impedance Understanding specifications How to choose an op amp Op amp circuits summary One of the key aspects of the performance of operational amplifiers and their electronic circuit design is the gain. Operational amplifiers on their own offer huge levels of gain when used in what is termed an open loop configuration. Under open loop conditions, the op amp gain may be anything upwards of 10 , with some operational amplifiers having gain levels extending to well over ten times this figure. Even with op amps of the same type there may be large gain variations as a result of the fabrication processes used. Whilst op amps themselves offer huge levels of gain, this gain is seldom used in this form to provide signal amplification - it would be hugely difficult to utilise as even very small input signals would drive the output to beyond the rail voltages with the resulting limiting or clipping of the output.

Operational Amplifier as Integrator

About Help Login. SMAP will make global measurements of soil moisture at the Earth's land surface and its freeze-thaw state. These measurements will allow significantly improved estimates of water, energy and carbon transfers between the land and atmosphere. Soil moisture measurements are also of great importance in assessing flooding and monitoring drought.




Comments: 5
Thanks! Your comment will appear after verification.
Add a comment

  1. Nefertum

    This brilliant idea is all right about

  2. Taumuro

    Thanks for the information.

  3. Zolojinn

    I would love to read your other articles. Thanks.

  4. Meztiramar

    I don’t know how anyone, but I like such surprises !!!! ))))

  5. Kendrik

    This is your handiwork!