Category Archives: Components

FRAM guide from Fujitsu

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When looking at the application notes section of Fujitsu’s site, viagra here I came across their FRAM memory guide book. I was surprised as I did not know what FRAM really was and so I flipped throug. Basically, cheap a film deposition process was developed, which is compatible with standard CMOS processing, that introduces films who can maintain their polarization after the applied electric field is removed. We are all familiar with ferromagnetic devices, these are the pieces of metal that can be magnetized when placed in a constant magnetic field. Thanks to some nice electromagnetic research, we can do something similar with thin films and thereby create ferroelectric capacitors that are capable of retaining data without applied power while being as fast as SDRAM. It is clear that half of the Fujitsu guide is a sales pitch for their ICs, however, the other good is a fairly good introduction to the FRAM technologies. The basic technology is discussed along with some typical ferroelectric substrates. A reference list is also attached.

( mn05-00009-5e.pdf )

IC Friday: National Semiconductor’s LMC6442

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This weeks images are of the LMC6442 dual op-amp from National Semiconductor. The devices organization makes it somewhat easy to read with the top and bottom halves dedicated to the two op-amps. Looking at the bottom half, sick
the two inputs are at the bottom center and the op-amp output pin is in the bottom right corner. The circular structures that look like BJTs near the in/out pins are not for driving, page
but for ESD protection. It looks like the main differential transistor pairs are above the input pins around the center of the chip. The left portion of the device looks to be biasing/current-source circuitry while the right side two-three gain stages. Two metal capacitors can also be seen per op-amp which are likely used for frequency compensation.

I am going to try to focus the next few weeks on more analog ICs as well as an ADC and DAC, sales
these will hopefully be easier to “read” and will give some insights into IC layout.

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IC Friday: Sony’s CXM4000 (PS2)

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The chip on today’s IC Friday is Sony’s CXM 4000, dosage an unknown IC inside the PlayStation 2 game console. Nothing too surprising so I tried to capture as many of the processing layers as possible in a series of images.

Regarding the spring cleaning giveaway, all of the chips finally got sent out yesterday and will hopefully start arriving at their destinations soon. Any oily residue on the slides is just microscope oil which was used to limit light scattering at higher magnifications. This can be washed off with soap and water. The writing is typically with a sharpie marker and can be washed off using alcohol.

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Free instrumentation amplifier guide from Analog Devices (paper format)

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Like all component manufacturers, pulmonologist Analog Devices is eager to get their devices into the hands of engineers and into products on the market. They seem to want to push their instrumentation amplifier section so they are offering a free, symptoms printed copy of their in-amp design guide. The product can be selected from Analog’s viagra dosage 2886,734_770_65746,00.html”>Technical Bookstore which offers the book for free (two day shipping included). Although I mainly use Burr-Brown chips (from TI), I am open to using Analog’s devices as long as they offer some advantages. I am particularly looking for low-power in-amps to replace the INA2332s that I use as a certain batch seems to be prone to latch-up in the presence of a noisy DC power source. I will update this post when I get the book (on 5/21) so you can either order it now or wait until next week to see if it is really worth the time.

Impedance measurement handbook from Agilent

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To follow up the last post on resistor selection, pfizer
here is a the Agilent Technologies Impedance Measurement Handbook. I found this handbook to be quite useful and well written as it covers everything from the basics of measurement problems to examples of both low frequency and RF frequency impedance measurements. The authors focused on the often overlooked parasitic properties of common system components as well as the measurement systems themselves. They go on to outline methods to construct test structures and procedures to minimize these parasitics and go on to give practical examples. For obvious reasons, ed
all of the test equipment in the handbook is made by Agilent, however, other brands can be used just as well.

( 5950-3000.pdf )

Resistor selection app-note from Ohmite

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In all of my undergraduate and graduate career, information pills I have had very little introduction to passive component selection. Most of what I know come at the expense of poor designs and from Bob Pease’s book on troubleshooting analog circuits. It should be known that resistors typically have small associated capacitances and inductances which can lead to strange circuit effects, however, this application note focuses mostly on selecting the right resistor based on power rating.

As circuits get smaller, using a something as small as a 0201 format resistor becomes fairly attractive. The downside (there are always downsides!) is that as the package size goes down, so does the power rating. Other factors, like enclosure and cooling, can change the rated dissipation limit. Although the app note covers many of these factors, they also provide a useful “shortcut” sheet on the seventh page to simplify the possible de-rating calculations for a particular circuit design. This information is still missing from many third year EE circuit design courses, so hopefully this PDF will provide an adequate supplement.

( appnotes_res_select.pdf )