View allAll Photos Tagged capacitance
Vishay’s new RFCS surface-mount thin film RF capacitor has the industry's highest self resonance frequency (SRF), which ranges from 8.5 GHz to upwards of 20 GHz depending on capacitance. The RFCS series of capacitors replaces the previous generation HPC product line. (For hi-res version, select "View all sizes" from Actions pulldown menu above.)
This 3D stereographic photo is of the CardioMEMS device, an implantable pressure sensor that wirelessly measures pulmonary artery pressures without requiring any batteries. It is used for heart failure patients to monitor their hemodynamics and estimate their volume status. This aids in prophylactically adjusting diuretics and heart failure medications before a patient becomes symptomatic and has to present to a hospital for a heart failure exacerbation. Reducing hospitalizations and HF exacerbations would aim to reduce mortality and improve quality of life.
The device is pretty amazing as it is very small and works indefinitely without batteries. The main component is a 15mm x 3.4mm x 2mm rectangle with two nitinol wire loops on each side that extend the length of the device to 4.5cm. Nitinol is a metal alloy of nickel & titanium that exhibits shape memory and superelasticity. Nitinol is commonly used for stents and other medical devices as it is biocompatible and folds up nicely in a tiny catheter before being deployed in the body where it expands to its full size and shape. This anchors the device in the distal pulmonary artery.
Its theory of operation is exceedingly simple in terms of design. It consists of a three dimensional coil of wire and two metal plates on two wafers of fused silica encased in silicone. The coil is produced through electrodeposition of gold onto a silica wafer in a vacuum chamber. Fusion bonding is used to join the silica wafers. The coil of wire forms an inductor and the two metal plates act as a capacitor in physics & electronics terms. This arrangement connected in a parallel loop forms a resonant LC circuit (L=inductance, C=capacitance). Depending on the capacitance and inductance of the components, the circuit will oscillate at a perferred resonant frequency. The capacitor in the CardioMEMS is exposed and very thin allowing the silica crystal and metal plates to deform with changes in pressure from the blood within the pulmonary artery. Changing the distance between metal plates of a capacitor changes its capacitance value thereby changing the devices resonant frequency. An external machine can ping and excite the coil with various electromagnetic radio frequencies until it is able to find its resonant frequency. By working backwards, the measured frequency can be converted into an estimated capacitance which can be correlated to an estimated pressure measurement.
The device is placed during the right heart catheterization (RHC) procedure when the physician threads catheters from a patient's veins through the right atria, past the tricuspid valve, through the right ventricle, and finally past the pulmonary valve into the pulmonary artery. Fluoroscopy or video x-rays along with radiopaque contrast are used to visualize the blood vessels and guide the catheters to their destination. During the RHC, the cardiologist will use a Swan-Ganz catheter to measure the actual pressure and calibrate the device's measured pressures to actual pressures.
doi.org/10.1177/1753944719826826
This photo is in 3D crossview. You cross your eyes while keeping the screen centered and it should become one image at the center in 3D. More Instructions for viewing 3D images: www.3dphoto.net/text/viewing/technique.html
Stereo Viewer for all my photos: jongames.com/stereophoto/
The rating is 250VAC and the capacitance (not shown) is 0.047uF. To be on the safe side I've ordered a replacement rated at 275VAC.
The capacitance of the aircraft to hold an electronic charge is maxed out, and demonstrated by St. Elmo's fire offering assurance that all aboard will have their "fill" of static electricity. It makes the hair stand up on your arms.
For computing, telecom, and industrial applications, Vishay’s T59 series of vPolyTan multi-anode polymer surface-mount chip capacitors delivers the industry’s highest capacitance density, while maintaining best-in-class ESR.
Today I finally got to play a musical instrument I've wanted since I was a kid.
UPS have just delivered my Moog Theremin - an electronic device that you play without touching (your hands alter the capacitance of a couple of circuits including an antenna: one for volume, one for pitch) and I've already been making eerie science fiction noises with it, all the while with a big grin on my face.
Himalayal HIVT serial Intermediate transformer is special designed for high capacitance or untra high capacitance power transformer testing. The system can be act as power transfromer testing source.
For power transformer testing, its normal to equip power frequency ac test transformer, medium frequency motor generator and high capacitance intermediate transformer to act as power source.
I'm really impressed with how well this tester works. Both with measuring capacitance and testing for leakage.
Machining the MHV high voltage connector mount. The plan is to design a high slew rate opamp charge amp to make response cable capacitance insensitive, and some buffered outputs to PHA, rate counters and other instruments. Needs to have good overload tolerance, as unscheduled high energy pulses will be trying to drive it offscale in normal operation.
Offering industry-best capacitance-voltage ratings in six molded case codes, Vishay’s T58 series of vPolyTan solid tantalum surface-mount chip capacitors delivers increased volumetric efficiency for handheld consumer electronics.
MERAKI is a responsive environment with live performance. Interactive wires are attached to 4 spatialized speakers and human body capacitance is therefore used to trigger alterations on sound and image. Live guitar, melodica, voice and midi controllers are used to create a sonic atmosphere that floods the space with a large range of sonic impulses. [Photo © 2013 Emilio Vavarella.]
sealed wet tantalum capacitor is the only such device qualified to the MIL-PRF-39006/33 specification to offer capacitance from 15 μF to 680 μF over a wide voltage range from 50 V to 100 V.
Less ringing this time, not sure what I did differently here. Probably has a more to do with the dynamics of the arc itself. It looks like the broken IR-sensor-now-IR-PV-Cell is fairly nonlinear, exhibiting compression as intensity rises which is to be expected due to the shunt resistor not being a constant current source and the large internal capacitance. So... not really sure how to interpret without a way to calibrate and linearize! At least I have a baseline for future reference :)
A fifties style impedance bridge (ESI 250DA). Extremely versatile. A Wheatstone, Capacitance Comparison, Maxwell and Hay Bridge rolled into one. Accuracy is basically 0.1% without going into detail. Also notice the great Fluke 887A in the background. Everybody should have one.
This is a MMC I made for my ZVS flyback driver becuase the previous caps were getting warm at around 300W. Still has the same total capacitance of .5uF.
ON Semiconductor provides thyristor surge protection devices (TSPDs) for surge protection circuits. They now have introduced the NP-MC series - a new family of ultra-low capacitance Thyristor Surge Protection Devices (TSPDs) that provide protection to sensitive electronic equipment from transient overvoltage conditions.
The Vishay Polytech T55 series of vPolyTan™ surface-mount polymer tantalum molded chip capacitors has been enhanced with higher capacitance and lower ESR in the A, B, and T (low-profile B – 1.2 mm max.) case sizes.
Replacing the stock Nichicon GU power filter capacitors of Cayin LA34 Tube Integrated Amplifier with the same capacitance and size.
As explored last year in the form of the "TouchMe Tree" (http://illutron.dk/posts/205) we have used capacitive touch sensing to create a Christmas tree whose lights only turn on when the tree is being touched or played with.
(Text from our original post at illutron.dk/posts/205)
Using a AC switch mode power supply as a switch mode generator to create noise, the plant’s capacitance is measured, and added to when a human touches it (thus adding capacitance). As the voltage varies, the noise changes and is filtered in such a way that the lights get brighter as the tree is being touched. Depending on how long the tree was touched for, the lights fade away to nearly being off until they regain a steady flow and return to a normal lit state.
Technically, this is being done via a single ATTiny45 chip, a string of Christmas LEDs, and wire connecting to the base of the Christmas Tree.
Credit is due...
Music:
"Our Slanted Voices"
by DoKashiteru
Original Illutron/GeekPhysical TouchMe tree project:
illutron.dk/posts/205
Fantastic tree-loving friend:
Nina Rydahl Andersen
My steampunk costume for halloween this year. Chronal Adventures!
The device in my hand is the Chronological Fluctuation Capacitance Machine.
Officially it supports 1pF to 500µF with auto-ranging. It also measured a 1000µF cap, but locked up after that. Can't blame it for that I think. Auto-ranging is pretty quick with small capacitances.
This 3D stereographic photo is of the CardioMEMS device, an implantable pressure sensor that wirelessly measures pulmonary artery pressures without requiring any batteries. It is used for heart failure patients to monitor their hemodynamics and estimate their volume status. This aids in prophylactically adjusting diuretics and heart failure medications before a patient becomes symptomatic and has to present to a hospital for a heart failure exacerbation. Reducing hospitalizations and HF exacerbations would aim to reduce mortality and improve quality of life.
The device is pretty amazing as it is very small and works indefinitely without batteries. The main component is a 15mm x 3.4mm x 2mm rectangle with two nitinol wire loops on each side that extend the length of the device to 4.5cm. Nitinol is a metal alloy of nickel & titanium that exhibits shape memory and superelasticity. Nitinol is commonly used for stents and other medical devices as it is biocompatible and folds up nicely in a tiny catheter before being deployed in the body where it expands to its full size and shape. This anchors the device in the distal pulmonary artery.
Its theory of operation is exceedingly simple in terms of design. It consists of a three dimensional coil of wire and two metal plates on two wafers of fused silica encased in silicone. The coil is produced through electrodeposition of gold onto a silica wafer in a vacuum chamber. Fusion bonding is used to join the silica wafers. The coil of wire forms an inductor and the two metal plates act as a capacitor in physics & electronics terms. This arrangement connected in a parallel loop forms a resonant LC circuit (L=inductance, C=capacitance). Depending on the capacitance and inductance of the components, the circuit will oscillate at a perferred resonant frequency. The capacitor in the CardioMEMS is exposed and very thin allowing the silica crystal and metal plates to deform with changes in pressure from the blood within the pulmonary artery. Changing the distance between metal plates of a capacitor changes its capacitance value thereby changing the devices resonant frequency. An external machine can ping and excite the coil with various electromagnetic radio frequencies until it is able to find its resonant frequency. By working backwards, the measured frequency can be converted into an estimated capacitance which can be correlated to an estimated pressure measurement.
The device is placed during the right heart catheterization (RHC) procedure when the physician threads catheters from a patient's veins through the right atria, past the tricuspid valve, through the right ventricle, and finally past the pulmonary valve into the pulmonary artery. Fluoroscopy or video x-rays along with radiopaque contrast are used to visualize the blood vessels and guide the catheters to their destination. During the RHC, the cardiologist will use a Swan-Ganz catheter to measure the actual pressure and calibrate the device's measured pressures to actual pressures.
doi.org/10.1177/1753944719826826
This photo is in 3D crossview. You cross your eyes while keeping the screen centered and it should become one image at the center in 3D. More Instructions for viewing 3D images: www.3dphoto.net/text/viewing/technique.html
Stereo Viewer for all my photos: jongames.com/stereophoto/
For smartphones, tablets, notebooks, and wearables, the Vishay Semiconductors VBUS05M2-HT1 bidirectional symmetrical (BiSy) 2-line ESD protection diode offers low capacitance and leakage current in the ultra-compact LLP1006-3L package.
www.cryscore.com/silicon-on-sapphire.html
A Brief Introduction of Silicon on Sapphire Technology
Silicon on sapphire (SOS) technology is a hetero-epitaxial process for metal-oxide-semiconductor (MOS) integrated circuit (IC) manufacturing that consists of a thin layer (typically thinner than 0.6 µm) of silicon grown on a sapphire (Al2O3) wafer. SOS is part of the silicon-on-insulator (SOI) family of CMOS (complementary MOS) technologies. Typically, high-purity artificially grown sapphire crystals are used.
The silicon is usually deposited by the decomposition of silane gas (SiH4) on heated sapphire substrates. The advantage of sapphire is that it is an excellent electrical insulator, preventing stray currents caused by radiation from spreading to nearby circuit elements. SOS faced early challenges in commercial manufacturing because of difficulties in fabricating the very small transistors used in modern high-density applications.
This is because the SOS process results in the formation of dislocations, twinning and stacking faults from crystal lattice disparities between the sapphire and silicon. Additionally, there is some aluminum, a p-type dopant, contamination from the substrate in the silicon closest to the interface.
Why is Silicon on Sapphire Technology So Important to Integrated Circuit
Due to sapphire has high permittivity that can eliminate the interaction between components of the integrated circuit, not only can reduce leakage current and parasitic capacitance, enhance radiation resistance and reduce power consumption but also can improve the level of integration and two-layer wiring, thus, sapphire is the ideal material for large scale and very large scale integrated circuit.
Silicon on sapphire technology provides ideal isolation and reduces the parasitic capacitance at the bottom of the PN junction, so it is suitable for high-speed large scale integrated circuits to achieve high speed and low power consumption. This process is generally used to make CMOS circuits.
In addition, in the SOS microelectronic circuit design and production, all kinds of semiconductor devices usually need to make on the structural integrity silicon thin film, and because thermal expansion coefficient of silicon is similar to sapphire, a silicon monocrystalline film (100) can be grown on the surface orientation(1-102) of the sapphire substrate by heteroepitaxy.
At present, sapphire crystal has become a widely used substrate for the growth of semiconductor materials.
Gemsâ„¢ Sensors & Controls 830 series pressure sensor is designed for wet-to-wet differential pressure measurements of liquids or gases. They feature fast-response capacitance sensors that respond approximately 20x faster than conventional fluid-filled transducers.
Product Description & Specifications
* Humidity meter & Type K/J Thermometer (optional probe extra) are combined into one meter, intelligent.
* Precision humidity sensor for humidity measurement, high precision, fast response.
* Type K/J thermometer build in temperature linearity & precision cold junction compensation circuit, high accuracy.
* Microprocessor circuit assures maximum possible accuracy, provides special functions and features.
* Super large LCD display, easy readout.
* Dual function meter's display.
* Heavy duty & compact housing case, designed for easy carry out & operation.
* Records Maximum and Minimum readings with recall.
* Auto shut off saves battery life.
* Data hold function for stored the desired value on display.
* Show the humidity & temperature values on the LCD display at same time.
* Temperature function for C or F be selected by push button on front panel easily.
* Built-in low battery indicator.
* Humidity measurement uses a high precision thin-film capacitance sensor for fast response, not depend on air movement past the probe.
* Humidity probe built-in thermistor sensor for temperature measurement, fast response time.
* Wide range both of humidity & temp. measurement.
* Separate humidity & temp. probe, easy operation and remote measurement.
www.instrumentchoice.com.au/instrument-choice/environment...
MERAKI is a responsive environment with live performance. Interactive wires are attached to 4 spatialized speakers and human body capacitance is therefore used to trigger alterations on sound and image. Live guitar, melodica, voice and midi controllers are used to create a sonic atmosphere that floods the space with a large range of sonic impulses. [Photo © 2013 Emilio Vavarella.]
2 10 microfarad caps in series, and 1 2.2 microfarad cap in parallel = 7.2 microfarad . View corresponding blog post at www.pushtheotherbutton.com
MERAKI is a responsive environment with live performance. Interactive wires are attached to 4 spatialized speakers and human body capacitance is therefore used to trigger alterations on sound and image. Live guitar, melodica, voice and midi controllers are used to create a sonic atmosphere that floods the space with a large range of sonic impulses. [Photo © 2013 Emilio Vavarella.]
MERAKI is a responsive environment with live performance. Interactive wires are attached to 4 spatialized speakers and human body capacitance is therefore used to trigger alterations on sound and image. Live guitar, melodica, voice and midi controllers are used to create a sonic atmosphere that floods the space with a large range of sonic impulses. [Photo © 2013 Emilio Vavarella.]
We define the dependence on how much charge a capacitor can hold at a given potential difference as capacitance.
Capacitance is the ratio of charge/potential difference:
C=Q/ΔV
We measure this quantity in a unit called Farads, which is a very large unit. Most capacitors we use are masured in microfarads, nanofarads, or picofarads.
Note that we are using Q instead of q for charge. This is to distinguish between small charges and the total charge on the device.
Since Q=CΔV, we can explain the patterns we saw in lab. For a given potential, it's the capacitance that's changing as we change the capacitor geometry. We saw bigger plates caused more Q. That means more C. Plates that were further apart caused less Q. That means less C. So we see that C=kA/d. The constant in this case is a fundamental constant that we abbreviate as ε˳ which we call the permittivity. It's a constant like G, or π. It will always be given to you.
We can also use the definition of capacitance to understand the dependence of energy stored on electric potential. Since U=QV, we can plug Q=CV in to get a dependence of energy on potential and capacitance. As we charge a capacitor, it goes from zero potential difference to a final potential difference. The average potential for the capacitor as it charges is (0+V)/2. So we can plug CV in to Q, and (½V) in for V.
Effect of MOSFET Gate-to-Drain Parasitic Capacitance on Class-E Power Amplifier
Xiuqin Wei, Hiroo Sekiya, Shingo Kuroiwa, Tadashi Suetsugu, Marian Kazimierczuk
ON Semiconductor (Nasdaq: ONNN), a leading global supplier of high performance, energy efficient, silicon solutions announces the release of a new family of low capacitance Thyristor Surge Protection Devices (TSPD) designed to protect the next generation of high speed telecom equipment. The new devices provide a superior balance of small size combined with high surge capabilities while maintaining low capacitance and low leakage, an ideal combination for leading edge telecom products.