An integrated circuit (IC) is an electronic circuit built onto a single plate of a semiconductor material, normally silicon. Modern ICs may contain billions of transistors and they have played a major part in the miniaturization and performance improvements of modern electronic systems.

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Alternative to LTC2644 with larger packaging

I am looking for an alternative to the LTC2644 (pdf). It's a DAC that converts a PWM into an analog signal. But since I have to solder them with my clumsy hands on the circuit board myself, I am ...
4
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1answer
71 views

Why Cadence not revealing their prices for their software product? [on hold]

I contacted the Cadence office as a PhD student and also a faculty member to inquiry their price for an academic license. After 8 emails back and forth I noticed that they are not willing to answer ...
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18 views

Pulse filter in IR2125

I am trying to implement the chip IR2125 as follows : http://www.infineon.com/dgdl/ir2125.pdf?fileId=5546d462533600a4015355c85ba31694 But I have been unable to find what kind of pulse filter is being ...
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0answers
24 views

How to choose value of a load resistor for a bandgap voltage reference circuit? [on hold]

I need a small help, could you please tell how to choose value of a load resistor for a bandgap voltage reference circuit test bench? Best, P.
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2answers
48 views

Analog crosspoint switches [on hold]

I am looking for analog crosspoint ICs that have a high number of channels, that can operate over 10V and are bi-directional. Currently I am using the circuit CD22M3494 and I am looking for an ...
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1answer
37 views

Must exposed pad (EP) for thermal dissipation be connected to ground for testing on breadboard

I am testing a MCP8063, 8-lead 4 mm x 4 mm DFN package with exposed pad. I have it deadbug to fit onto a breadboard. I have yet to get it to run a motor. Must the EP be grounded in order to test the ...
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2answers
258 views

Possiblity of Using Transistor as Resistor

I would like to know it if is posible to use NMOS transistor to act as a resistor with a sinusoidal power supply ? The circuit I have is very simple; it consists of a 20Vpp-sinusoidal source ...
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1answer
40 views

Why does this dual monstable not function as such?

I have wired up a simple circuit here to test the cmos one-shot multivibrator. The top half of the chip seems to work but the bottom half does not. I even replaced the chip with a new one and I get ...
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0answers
77 views

Is it a practical technique to add a dedicated flash/RAM IC to increase a microcontroller's memory to avoid writing to an SD card?

I'm working with an Atmega328P microcontroller. This microcontroller will be generating data and will be storing that data onto an SD card. My project will also be battery powered. My research has ...
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1answer
53 views

How large can the working die size in a wide PDIP package be?

What is the maximum die size for a 0.6" wide Plastic DIP package?
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0answers
29 views

How do I create a 5 second delay in my simple infrared barrier circuit?

I am building a simple infrared barrier circuit. When the barrier is cut, I want a five second delay before my piezzo goes off. I've read about the 555 timer IC but I don't exactly know how to use it ...
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1answer
112 views

What is the most common logic family in modern CPUs?

I know there are a lot of logic families, from the old RTL to LVC, but which is the most common of them? Can you also explain the reasons? I also wanted to know: which is the fastest and which has ...
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2answers
56 views

Does an IC package type have same dimensions regardless of who manufactures it?

There are numerous IC package types, popular ones being DIP, QFP, SOIC e.t.c and they have variations depending on how many pins they have I am designing my Eagle library and have a question. Is it ...
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3answers
185 views

How to deal with really tiny op-amps?

Every time I order an op-amp from DigiKey the op-amp arms are waaaay too small. Too small to prototype in my circuit board, and sometimes too small to solder. Is my only option to make a custom PCB, ...
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0answers
27 views

Voltage distribution in IC in MATLAB Simulink

I tried to simulate the IC IR2121 using simulink. I am trying to test the IC that I simulated. When I connect the voltage source directly to the Vcc, it gives an error stating that the current ...
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1answer
54 views

TSOP-54 Adapter for prototyping

I am using an ARM M based development board (1) from TI. I wish to extend RAM (from default 256KB to 256 KB+ 8MB)by following the provided reference design (2). The design uses an ISSI DRAM ...
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0answers
15 views

UCD90120A JTAG SVF export data flash hex file needed

I'm using the UCD90120A sequencer and I've wired the JTAG to a connector and the PMBus to my processor. Now during prototyping and before the processor is powered I'm counting on JTAG to upload my ...
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35 views

Photo-interrupter filter and digitizing circuit

I am trying to design a circuit that can filter and digitize a photo interrupter signal. I have the signal from the photo-interrupter (3.3V/ground) connected to a low pass RC filter with resistor ...
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1answer
49 views

How to get a CMOS transistor SPICE model?

So far in order to simulate CMOS circuits I relied on a library that I had to randomly download from Internet such as this one: http://ecee.colorado.edu/~ecen4827/spice/ltspice/5827_035.lib Inside ...
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1answer
33 views

Timing characteristics serial- & parallel input adressing

Hello I am looking on some analog and digital multiplexers that have high supply voltage along with high amounts of channels and I've found some that are programmable either serially or parallely and ...
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2answers
88 views

Is there a processor IC inside a microcontroller package? [duplicate]

I am reading about the TI TM4C12x microcontroller, which is available as an IC: The datasheet of one of its variants can be found here: http://www.ti.com/lit/ds/symlink/tm4c123gh6pz.pdf On the ...
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2answers
62 views

How does Touch Board work?

Some days ago I saw this device called Touch Board. It looks a bit like an Arduino (in fact it's based on Arduino). You can connect conductive materials to it, like aluminium foil. The board is able ...
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2answers
52 views

Defining wire jumper inside IC in software

Since I'm using Eagle to try to form a single-sided PCB and the autorouter completed my circuit by 99% (2 airwires to go), I thought of constructing my circuit so that I insert a flat jumper wire ...
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1answer
23 views

Replacement for MC12149 (Voltage Controlled Oscillator)

I need to build up a VCO from 250-350 MHz. I have found an interesting IC called MC12149 from Motorola. However, it seems to be archived and no longer manufactured. Looking at the datasheet, it looks ...
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1answer
20 views

MUX re-configuration speed

I am looking for some high voltage, high channel, analog multiplexers that I can change the configuration of very fast and I am just wondering if I am looking at this data correctly. When I look at ...
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12 views

Hey how do I increase the resistance of a photoresistor with increase in light intensity using Arduino? [migrated]

I'm building a laser tripwire of sorts and instead of shutting u when the laser points on it (which is essential for my project) it beeps louder. Here's the code ...
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1answer
33 views

Input capacitance of a differential amplifier

This lecture (page 11) shows how to calculate input impedance of a differential amplifier. As you can see from the image below the input capacitance is calculated through the steps shown at the right....
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1answer
54 views

Somethings about Infineon BTN8962

I want to design a BDC driving board with Infineon BTN8962.(Infineon BTN8962 is a half of H-bridge IC) As we all know,BDC driving circuit is just like this: In this picture,We set a High side MOS(...
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111 views

What is the ABEL code for this 12x1 Multiplexer and Truth Table

I have to create a 12x1 multiplexer using two 8x1 multiplexers. Here is the truth table, I need the ABEL Code.. Please tell me how to write the ABEL code for this truth table of the given scenario. ...
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0answers
69 views

24V to 3.3V Level Shifter

this is my first post so please excuse me for incomplete or improper text. I am developing an interface board to connect ‘Converter control unit’ to HIL system. For this purpose I need to level shift ...
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0answers
36 views

Confusion in creating 16 input Multiplexer using two 8input multiplexers

I have 16 inputs A0 to A15. Selection pins: 4 (S0 to S3) I want to create a 16 input multiplexer using two 8input multiplexers combination. But I dont know where to connect the selection pins and how ...
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2answers
18 views

SR Latch settles on equilibrium state with lower voltage supply

I need to use SR latch for my design and it was working fine. Until I started it with lower voltages. CON8 and O4 are the inputs. CON9 is the output. When I use 15V supply, it works very fine: ...
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2answers
1k views

Can I replace multiple NPN transistors with some kind of IC?

I am currently using BC 547 transistor and an Arduino Uno to turn a low power switch on and off. I have successfully achieved this with one of the Arduino output pins, but would like to replicate this ...
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2answers
53 views

Making a singing greeting card [closed]

I have very limited knowledge of electronics (the little that I learnt in high school physics) and I'd like to make a customized singing birthday card for my sister. The card could be triggered with ...
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1answer
21 views

How to use BSIM3v3 capacitance for hand calculation?

As you all probably know, capacitances in BSIM3v3 are just the partial derivatives of the terminal charges with respect to the terminal voltages. They are not physical two terminal capacitors. Cij = ...
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1answer
32 views

Should I use NMOS or PMOS in CMOS demultiplexer circuit?

I am trying to design a simple 1:2 demultiplexer. I have two question here. First, is the following design right?: (simulation shows that it is working) in_D is the input data line, in_S is the ...
7
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1answer
107 views

Use of desiccant for storage and delivery of electronics

I have several questions regarding desiccant and electronic components: Is there a rule of thumb on how much desiccant, let's say silica gel, to use per volume unit or per package area unit? Must ...
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1answer
69 views

I want a regulator which can give me 4.4V ,2A output…? [closed]

Is LM78S05 is fit or not? How can I reduce it to 4.4 V? I have used a Si diode for reduction but I didn't get the idea about how to do it. I am making a mobile charger.... Input-230V ac~60Hz Output-...
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0answers
21 views

YCbCr MPEG Codec IC / DVR example design

I'm looking into recording analog (composite) video (PAL/NTSC) to a SD card. I found several Analog Video Decoder ICs to convert the composite analog video to, say, 8-bit YCbCr parallel data, however ...
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0answers
41 views

MOSFET gate capacitance in strong inversion

This lecture (page 4 and 5) said about gate capacitance of a MOSFET in various operating condition. From the table below, as you can see in strong inversion \$C_{ox}\$ and junction capacitance \$C_{...
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1answer
25 views

Channel to bulk capacitance in inversion

This lecture (page 11) said that as Vgs increases further, the inversion layer forms and the channel to bulk capacitance is “shielded”. So the channel to bulk capacitance is 0. Could anyone explain ...
11
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2answers
642 views

Odd bypassed resistor network in the representative circuit of an MC7805 - what does it do?

Another question recently asked about the MC7805, and linked to its the datasheet for the generic MC7800-series of regulators1. When I read it, I noticed Figure 1, Representative Schematic Diagram, ...
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3answers
50 views

How to implement this function in transistor level?

I need to design a circuit that has this function. There is an input signal whether ON or OFF. I need this: Once the input signal is ON first, my output must be ON also and after that it has to stay ...
0
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2answers
27 views

What are SD/SS, delay, and flag pins on LM2596?

I'm studying the TI datasheet for an LM2596. On page 4, at the top left in section 7.1 Absolute Maximum Ratings, it mentions: \$\overline{\mathrm{SD}}/\mathrm{SS}\$ pin input voltage (6V) Delay pin ...
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1answer
18 views

How do I calculate maximum current that each pin of PC8575 is able to sink?

http://www.nxp.com/documents/data_sheet/PCF8575.pdf Can somebody tell me which parameter one should look for while looking for calculating maximium Current source/sinked by a pin.
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2answers
84 views

How to decide the Temperature range of an IC?

I am using a MAX3241E ic in a device that has to run 24x7 out in the open. I am facing a problem deciding the temperature range of the the IC. Since it is out in the open, the ic has to withstand the ...
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1answer
48 views

I have a problem with replacing N74LS05N in an old pcb

As inputs are connected in parallel with control inputs to Com via 10kohm resistors (to tie them to 0V when control input is floating, in absence of input (input in my case 4.5V=HI or isolated by ...
3
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2answers
58 views

RF Emissions Testing and Discovery of Hidden Undocumented RF Device

I would like to know is it possible to induce RF emissions (incidental waves (re-radiation) from a RF device that is not transmitting ? The purpose of this testing is discover whether there is a ...
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1answer
30 views

level translator IC for SPI [closed]

In my current project I am working on the scheme and need a IC with following requirements: - It has to be a lever translator from 2.2V to 3.3V; - It has 5 channels; - on 2.2V side It has 3 ...
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2answers
45 views

Chip Design Computer Generated Files for Fabrication Process

Could someone provide an overview of how the chip design files are used by the fabrication process? What I mean is once the design engineer(s) have completed the computer generated design blue print ...