What is the name for an IC that accepts an analog voltage and outputs a...
I want to isolate an analog signal. One way of doing this is to convert the analog signal to PWM, isolate the pulses with an optoisolator, and filter the PWM on the other side. Obviously I could do...
View ArticleWhat value determines the current flowing between two interconnected ICs?
If I connect two ICs (lets say two Arduino UNOs with one pin configured as OUTPUT and another as INPUT), something must limit the current so that there is not a short circuit when driving HIGH. What...
View ArticleWant to learn how the layers of a die from a SoC Processor IC is...
Does anyone know how the layers of a die from a SoC Processor IC (Qualcomm Snapdragon) found in many smartphone devices are arranged ? How the chipset (which handles the IO such as USB, Touch Screen)...
View ArticleHow difficult is to reverse engineer a IC Die?
Can anyone tell me how difficult, time consuming and expensive is to reverse all layers of a die ? Say a die from a recent model SoC Processor IC found in smartphone devices such as the Qualcomm...
View ArticleVoltage of Logic Low on ICs
I’m currently trying to create a 4 bit ALU using the CD4011BE quad 2-input CMOS NAND gate ICs. However, I’m having some trouble when creating the full adders. Sometimes, when the IC outputs logic low,...
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What are the holes on an optical flow sensor IC?
The right hand image is a flow sensor IC for an optical mouse available from Sparkfun. On the left is another optical flow IC with a camera attached from a Chinese distributor. It seems that the holes...
View ArticleWhen do I call it CPU and when IC-Chip?
Currently I’m a it confused. A IC (integrated Circuit) Chip implements one or many circuits on a chip in order to control any kind of stuff. However, a CPU is from my point of view also a BIG circuit...
View ArticleSoC Multi Cores and Boot Loaders
I have discovered that a typical SoC or MCU (multi core) have a boot loader which loads the bootstrap core. Could anyone tell me does each core require its own dedicated boot loader ? Is it possible to...
View ArticleHow to mount an OLGA package IC for development
I need to mount an IC with an OLGA package in a protoboard or wirewrapping board for development. There is no development kit in the manufacturer’s website for this IC, so all I have is two samples of...
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Why can't I simulate a current sensing IC (LT6100) using Proteus 8?
According to this image, I should be able to design a high side current sensing circuit with a gain of 10V/V using an LT6100: However, if I try to simulate this using Proteus 8 I get an error. Here is...
View ArticleWhat does “ku” or “kU” mean with regards to procuring ICs? (not about RF)
NB: This is not referring to RF subject matter. I’m seeing 1ku and 10ku on procurement documentation for purchasing motor driver ICs (TI DRV8811 and some others). Does this mean “one-thousand units”?...
View ArticleARM Multi Cores on SoC's at Close Proximity
Could someone help me understand whether it is correct to assume that all ARM cores on a device such as a smart phone must be closely located on die for faster communications ? Otherwise would the...
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Why can't I simulate a current sensing IC (LT6100) using Proteus 8?
According to this image, I should be able to design a high side current sensing circuit with a gain of 10V/V using an LT6100: However, if I try to simulate this using Proteus 8 I get an error. Here is...
View Article2 channel per circuit component election
I was looking for some references for a level shifter connected to an intel edison and a found that they used a 74LVC(H)1T45 which have one channel per circuit. Then I found the same IC but with two...
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7805 efficent circuit?
The below circuit is 12v Input & 5V max@3Ampere output. The work of the 7805 is only to open the base of the transistor.(and naturally regulate that voltage at the base to 5v) What about efficency,...
View ArticleIdentifying ICs via markings
I’m having a little trouble identifying 2 ICs – I’ve tried the Google, can’t seem to get a lock on it. Anyone have any ideas? One is from international Rectifier – P311T is the number next to their...
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Bias common source with current source load
How would you choose Vb and bias voltage for M1 to make M1 and M2 operate in saturation mode for the configuration below: M1 saturation: Vout – Vb < Vt1 M2 saturation: Vin – Vout < Vt2 How to...
View Articleun-identified IC's
I would like to ask for identification of a few IC’s and their functions, I’ve collected up a lot over the years mostly from prying them very carefully off circuit boards that did not work due to other...
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Switching multiple outputs with a single input
Here’s my problem. I need a way to switch between two inputs of four signals each (four 5V lines and 4 3V3 lines). They need to be switched together, and ideally with a single jumper or an electrical...
View ArticleSuggestion on Input selector
I am working on a design where I have 2 digital signals one is TX while other is RX. and at the output both are connected to same connection. This means my output is bi-directional. I am looking for a...
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