نتایج جستجو برای: dc offset

تعداد نتایج: 80203  

2008

A low-noise, 2.5V reference is constructed by stacking four 2.5V reference ICs in series. The resulting 10V output is divided back to 2.5V, and a low-noise unity-gain buffer added. This stacked-reference design reduces noise because the noise from each IC, being random and uncorrelated, partially cancels each other out. The low-frequency 1/f noise (LF noise) generated by a voltage reference at ...

2014
Amir Mahmood Soomro Shahnawaz Farhan Khahro Shahnawaz Talpur Liao Xiaozhong Farhan Manzoor

This paper explores a configuration for boost half bridge DC-DC converters, connected in parallel at the input and series at the output, such that the converters share the input current and load voltage equally. A stable control scheme has been developed to achieve this objective. In order to verify the effectiveness and stability of control scheme, input-parallel output-series (IPOS) connected...

1999
Anthony Chan Carusone David A. Johns

Analog adaptive filters with digitally programmable coefficients can provide speed, power, and area advantages over digital adaptive filters while overcoming the dc offset problems associated with fully analog implementations. However, digital estimates of the filter states and gradient signals must be generated from the filter output in order to perform LMS adaptation. State observers studied ...

2004
D. Czarkowski

A systematic derivation of DC-circuit and small-signal-circuit models and characteristics for pulse-width-modulated buck-derived convertors operating in the continuous conduction mode is presented. Starting from voltageand currenttransfer functions of an idealised switching part of the convertor and using the linearisation technique, pure linear-circuit models of lossless convertors are derived...

Journal: :Journal of physics 2022

Abstract A MOSFETs switching times calculation method for the known modulation strategy bidirectional buck + boost DC-DC converter is presented. former low-loss, constant-frequency based on a negative inductor offset current takes place at beginning of each conversion period which provides ability to turn converter’s MOSFET switches under zero-voltage and zero (ZVS/ZCS) condition. Time interval...

2004
Bruce R. Land Bruce R. Johnson Robert A. Wyttenbach Ronald R. Hoy

We describe the design of inexpensive equipment and software for physiological stimulation in the neurobiology teaching laboratory. The core component is a stimulus isolation unit (SIU) that uses DC-DC converters, rather than expensive high-voltage batteries, to generate isolated power at high voltage. The SIU has no offset when inactive and produces pulses up to 100 V with moderately fast (50 ...

2009
Rong Wu Kofi A. A. Makinwa Johan H. Huijsing

This paper presents a chopper instrumentation amplifier for interfacing precision thermistor bridges. For high CMRR and DC gain, the amplifier employs a three-stage current-feedback topology with nested-Miller compensation. By chopping both the input and intermediate stages of the amplifier, a 1 mHz noise corner was achieved at an input-referred noise power spectral density (PSD) of 15 nV/ Hz. ...

2002
Chris D. Holdenried James W. Haslett

In this work, parallel feedback amplifiers (PFAs) are presented as a means of generating ultra broadband logarithmic amplifiers. The low frequency gain equations and an AC model of PFAs are given. A circuit is presented for automatic, on-chip DC offset error reduction. In addition, circuits for achieving temperature and process stable, high power, low noise logarithmic amplifiers are described....

2000
H. C. Huang P. W. Cheng H. S. Kwok

We have performed systematic characterizations of flicker in silicon light valves. It was found that there were four conduction mechanisms accounting for the flicker. These four mechanisms were residual dc charge on the silicon surface, voltage holding capability of the liquid crystal cell, voltage holding capability of the silicon panel, and parasitic capacitor coupling of the pixel. Major cau...

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