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- Sample_and_hold abstract "In electronics, a sample and hold (S/H, also "follow-and-hold") circuit is an analog device that samples (captures, grabs) the voltage of a continuously varying analog signal and holds (locks, freezes) its value at a constant level for a specified minimum period of time. Sample and hold circuits and related peak detectors are the elementary analog memory devices. They are typically used in analog-to-digital converters to eliminate variations in input signal that can corrupt the conversion process.A typical sample and hold circuit stores electric charge in a capacitor and contains at least one fast FET switch and at least one operational amplifier. To sample the input signal the switch connects the capacitor to the output of a buffer amplifier. The buffer amplifier charges or discharges the capacitor so that the voltage across the capacitor is practically equal, or proportional to, input voltage. In hold mode the switch disconnects the capacitor from the buffer. The capacitor is invariably discharged by its own leakage currents and useful load currents, which makes the circuit inherently volatile, but the loss of voltage (voltage drop) within a specified hold time remains within an acceptable error margin.For practically all commercial liquid crystal active matrix displays based on TN, IPS or VA electro-optic LC cells (excluding bi-stable phenomena), each pixel represents a small capacitor, which has to be periodically charged to a level corresponding to the greyscale value (contrast) desired for a picture element. In order to maintain the level during a scanning cycle (frame period), an additional electric capacitor is attached in parallel to each LC pixel to better hold the voltage. A thin-film FET switch is addressed to select a particular LC pixel and charge the picture information for it. In contrast to an S/H in general electronics, there is no output operational amplifier and no electrical signal AO. Instead, the charge on the hold capacitors controls the deformation of the LC molecules and thereby the optical effect as its output. The invention of this concept and its implementation in thin-film technology have been honored with the IEEE Jun-ichi Nishizawa Medal in 2011.During a scanning cycle, the picture doesn’t follow the input signal. This does not allow the eye to refresh and can lead to blurring during motion sequences, also the transition is visible between frames because the backlight is constantly illuminated, adding to display motion blur.".
- Sample_and_hold thumbnail Sample-hold-circuit.svg?width=300.
- Sample_and_hold wikiPageExternalLink v=onepage&q=sample%20and%20hold&f=false.
- Sample_and_hold wikiPageExternalLink v=onepage&q=sample%20and%20hold&f=false.
- Sample_and_hold wikiPageExternalLink MT-090.pdf.
- Sample_and_hold wikiPageExternalLink product_detail.jsf?isbn=0&catno=k12557.
- Sample_and_hold wikiPageExternalLink an517.pdf.
- Sample_and_hold wikiPageID "571325".
- Sample_and_hold wikiPageRevisionID "583548339".
- Sample_and_hold hasPhotoCollection Sample_and_hold.
- Sample_and_hold subject Category:Digital_signal_processing.
- Sample_and_hold subject Category:Electronic_circuits.
- Sample_and_hold comment "In electronics, a sample and hold (S/H, also "follow-and-hold") circuit is an analog device that samples (captures, grabs) the voltage of a continuously varying analog signal and holds (locks, freezes) its value at a constant level for a specified minimum period of time. Sample and hold circuits and related peak detectors are the elementary analog memory devices.".
- Sample_and_hold label "Sample and hold".
- Sample_and_hold label "Sample and hold".
- Sample_and_hold label "Sample-and-Hold-Schaltung".
- Sample_and_hold label "Устройство выборки и хранения".
- Sample_and_hold sameAs Sample-and-Hold-Schaltung.
- Sample_and_hold sameAs Sample_and_hold.
- Sample_and_hold sameAs m.02r6tz.
- Sample_and_hold sameAs Q836482.
- Sample_and_hold sameAs Q836482.
- Sample_and_hold wasDerivedFrom Sample_and_hold?oldid=583548339.
- Sample_and_hold depiction Sample-hold-circuit.svg.
- Sample_and_hold isPrimaryTopicOf Sample_and_hold.
