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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55 views

9 Transistor full adder -ve value waveform

I am working on my 9 transistor full adder show below at 180 nm tech with 1.8v source, pulse width is 1ns ie. 500MHz But problem is my adder sum and carry waveform show –ve value at some points as ...
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2answers
36 views

PMOS, NMOS length width concept for low power circuit

Why for low power consumption width of NMOS taken same as length of feature and Width of PMOS taken as 2.5 times width of NMOS ? e.g for feature size 180n width of NMOS 180n and width of PMOS 450n. Is ...
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2answers
310 views

How do IC's know when there is a downward or upward transition of a clock pulse?

Title pretty much says it all. But how do most IC's, micro-controllers, etc. know when a clock cycle starts a downward or upward transition from the clock source?
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54 views

can anyone give the list of IC design [closed]

Hello I am learning IC design, I know there exist some technologies like SOC and 3D IC but can anyone give me correct information and tools used by companies like Intel and AMD to design IC's. I ...
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1answer
80 views

2 Transistor XOR Cell Floating Output Problem

I designed the following 2T XOR cell for my full adder purpose: Theoretically it gives correct output for all input combinations. But on Tanner Eda using 180nm technology 5V supply, it gives logic ...
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0answers
74 views

6 Transistor Full Adder

I am working on a 6 Transistor Full Adder whose circuit diagram is The circuit works fine but there is a problem: it needs a 25k resistor at XNOR and SUM point to show the complete Full Adder ...
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1answer
82 views

8 Transistor Full Adder

I am working on 8 Transistor full adder which is based on 3 Transistor XOR cell. I have studied many IEEE Papers for 8 Transistor Full adder. All have same ckt as above.But the full adder is not ...
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3answers
76 views

Op Amp reason for virtual ground [duplicate]

I'm very new to this topic Operational Amplifiers. Just started studying for my 4th semester. Can someone please explain to me why there is a virtual ground at the node after Rin. What is the reason ...
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0answers
51 views

DC shunt current measuring

I am trying to build DC shunt based high current measuring using bus bar. Each bus bar has a 1000V 20A rating. Is any IC available to measure? I have done with hall sensor based. So my plan to build ...
5
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1answer
173 views

How is EMI avoided inside of an IC?

I was re-watching this video about how CPUs are made and at the time of the video the link points to, I thought "Isn't there some EMI problems with all those transistor signals flying all over the ...
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4answers
169 views

Which of these marks signifies Pin 1 on the STM32F (LQFP64)?

I'm using the STM32F105, in a LQFP64 package. It has two circular markings, on opposing corners of the IC. This picture is for a different ST ARM, but the markings and silkscreen are similar: The ...
2
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0answers
70 views

Why are chips limited in their dimensions? [duplicate]

I am reading a book about digital logic and chip design. The book mentions that around 2012, the largest chip size that could be reliably manufactured is at about 858 mm². However, the book doesn't ...
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1answer
30 views

Planar process vs. 3D chip

As far as I know, the planar process of making IC, especially CMOS IC, is already a 3D process because a layer is added on top of an existing layer to realize various things (cf. Wikipedia IC Layout). ...
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1answer
28 views

making Tphl and Tplh equal

Let's say we have the following netlist ...
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3answers
89 views

Looking for 4 bit memory option

I'm building a small and simple 4-bit CPU and I'm looking for an IC to store the program opcodes. I've considered using eeproms although they seem too large for my purpose, being in the kilobyte ...
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0answers
41 views

What are my options for dual 4-input OR gates using the 74LS00 series ICs?

I have designed an ALU (Arithmetic Logic Unit) using Logisim and it's working quite well. In my design, I use a few 4-input OR gates. After reviewing this list of 7400 series ICs, I've come to the ...
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0answers
23 views

Issues With 74HC299 Register - Not outputting data after loading it

I am using a 74HC299 as an 8-Bit register in a project of mine. I am not using any serial circuits, it is just parallel input and output. I have it set up so that the master reset is hardwired to ...
4
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2answers
223 views

Cascading several SPI devices

Is it possible to cascade several different ICs on the same data line, in order to use less CS pins, by tying the digital output of each to the digital input of the next? I am familiar with this ...
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1answer
286 views

Weakest link in lifetime of electronic circuits

I'm working on a product, a single-board computer with an expected lifetime of 10-15 years, and I'm trying to identify the correct components to focus on for this. So far electrolytic capacitors ...
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3answers
143 views

What exactly is a microcontroller?

Can an optical mouse sensor chip (System On Chip) which has a digital signal processor, Serial I/O, and a set of registers be considered as a Micro-controller?
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2answers
83 views

Fan in Fan out problem

Fan out is the maximum number of inputs that can be connected to a specific output. Why can’t we connect more number of inputs to this output?
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4answers
1k views

Why do some people use resistors to create a HIGH connection on a chip?

This is a follow-up question to my previous one, What does Low/High mean on the connections of a chip?. To create a HIGH connection, you often just connect the pin to VDD, which is often above VIH ...
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1answer
92 views

What is difference? The name of IC's are punched or printed or stickered on top of it

I've seen in some IC's the name of it is 'printed' on the top side. But in some IC's the names are 'punched',they have impressions on the IC. And in some cases, a 'Sticker or a Label' has been ...
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2answers
173 views

Dimensions of TQFN-EP 48 lead package

I'm looking for the correct pcb footprint for the MAX1979 IC by Maxim, supposedly in a TQFN-EP package. While the land patterns are available on Maxim's website, there are apparently several 48 lead ...
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1answer
73 views

melting ic epoxy casing

I was attempting to remove solder with faulty solder braid (there was no flux in the section I was using (for some reason...)), and I kept the soldering Iron on it for far longer healthy. Now the ...
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1answer
46 views

Modifying a chip on a bought voltage measurer

I have bought a battery checker for my RC LiPo battery packs. The battery checker can measure and alarm at low voltages between 2.7 and 3.8 volts, however with LiPo batteries, the interesting range is ...
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1answer
99 views

AN7149N -based power amp usage

I have assembled AN7149N-based power amplifier according to the datasheet, but it shows no signs of life. The only changes I made were 2,7 ohm resistor instead on 2,2 ohm one, and 1000uF capacitor ...
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11answers
5k views

Why do we need so many transistors?

Transistors serve multiple purposes in an electrical circuit, i.e switches, to amplify electronic signals, allowing you to control current etc... However, I recently read about Moore's law, among ...
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4answers
307 views

Duplicate pins on an IC

I've realised that several ICs with simple components, such as the FDS6690, provide duplicate pins in order to comply with a standard IC package (e.g. SOT23). My question is - are these pins connected ...
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2answers
114 views

Possible to use 7447 to drive common-cathode 7 segment display?

I know that the 74(LS)47 is designed to drive common-anode displays. However, is it possible to make it drive a common-cathode display? What is the simplest (in terms of components) way of doing this? ...
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2answers
73 views

RAM/Latch Type IC

I was looking to find an IC (particularly in the 7400 series) that could act as a very simple RAM device, like a flip-flop or something. I came across 74hc373, but I'm not sure this is what I'm ...
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1answer
56 views

USB port suppressor

I am using SN65240PWG4 USB PORT SUPPRESSOR. This is a part of the schematic: (I have connected pins A (6) and B (8) to D- and D+ USB pins. C and D I must connect to the supply) In this schematic ...
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3answers
443 views

Power supply with LM723

I'm trying to troubleshoot a delinquent power supply I have. Most recently one of the transistors (Q1) actually exploded on it. This has led me into investigating the schematic, but try as I might, I ...
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2answers
66 views

Dynamic Logic - Transistor Sizing

If we have a circuit in dynamic logic: What should the size of the charge transistors (Qe and Qp) be? I know that increasing the size improves the speed but also increases the dissipation, and that ...
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2answers
133 views

How to make a color-changing LED circuit that runs off of a coin cell

I've been curious for quite some time about the 2-lead RGB color-cycling LED's. I know that they have 3 tiny LED's inside and an IC, but I'm really curious to understand what's going on in the IC that ...
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1answer
49 views

Measruement of RF Signal strength / phase difference

I would like to measure the signal relative strength and phase difference of two bluetooth(BT) receivers. and I found a chip that will do exactly that, AD8302 ...
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2answers
63 views

Difference between 7446,47 etc

I have looked in the data sheets, as well as the TI article, but I am still unsure of the answer to this question: What is the practical difference between a 7446 ("BCD to 7 segment decoder/driver ...
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3answers
186 views

DC-DC step up from 3V to over 100V

I'm currently building a DC-DC step up circuit to step up 3V to 100V. I don't want to use transformer because i want to keep the circuit as small as possible. My thought is ... building a 30V-output ...
5
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4answers
325 views

Will the schematic I created for my project work?

Edit: I made it and it works like a charm :D . Only had to connect the switch -ve to the -ve lane and the switch +ve to the +ve lane (not shown in schematic!!) and the circuit works like a chram. I ...
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1answer
40 views

How do I reverse this following circuit, i.e. when the laser is off then it should stop buzzing?

All the necessary symbols are given in the circuit itself. When the laser is shooted to photoresistor, then buzzer stops. I want to stop the buzzer as soon as laser gets off.
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3answers
155 views

Noobie at IC, need help with basic circuit that isn't returning correct values

Okay, first of, I'm a complete newbie at ICs and circuits and I'm doing this for a school project. I request answers to be in laymans terms and not proper, complicated terms. For my first ...
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2answers
135 views

How can I add three AC signals?

I have three light sensors which outputs appropriate AC currents with respect to light intensities. I only have one pin left for my ADC IC that I have on my board so I can't sample three sensors using ...
1
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1answer
43 views

Determine the output voltage of an integrated ciruit

I'm planning to use an HPA674A (bq25504 EVM) which is based on the bq25504 IC to connect a device (wsn) that works from 2-3.6V which is connected to the Vstor pin and the storage element is connected ...
3
votes
2answers
143 views

Boost converter 100mV to 5V

I am trying to design a boost converter which converts 100mV to 5V. 100mV is the minimum I get from my DC motor which I used as a generator and max is around 1V. I tried searching for the IC's which ...
1
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3answers
130 views

Lower power version of ULN2803?

I want to drive around 80 LEDs from an Arduino with 10 8-bit shift registers. (Some will be RGB LEDs; I count those as 3.) I know of the TPIC6B595 high power shift register but it's expensive: 1.75 ...
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2answers
101 views

7-segment display driver IC [closed]

Which IC can I use to control 7-segment display? I want to make simple projects like a reaction timer but I don't have an Arduino or some other microcontroller available. What ICs can I use instead?
2
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3answers
189 views

What are the failure mechanisms in an integrated circuit?

Context I've always tried to design my circuits for chips to be well within their absolute maximum ratings. However understanding the failure mechanisms is vital to be able to debug a chip when ...
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2answers
74 views

Is it necessary to connect all power pins to power pic16f877a [duplicate]

I am using a pic16f877a for a project and I noticed that there are two VDD and VSS pins. I wanted to know weather all 4 pins had to be connected to power or just one VDD and one VSS pin. A circuit I ...
5
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3answers
525 views

PCB fabrication vs PCB assembly

What is the difference between PCB fabrication and assembly? Some companies like Golden Phoenix list that based on the size of PCB, it outputs a quote. Mine was 2.1 x 1.6 inch. It outputted 29 pieces ...
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1answer
69 views

Prevent Clipping and Hum in class d amplifier [closed]

I got this amp. Now at large volumes, there seems to be clipping. How can I prevent it from happening, rather than never playing at high vol. Can it be done by AGC or Dynamic Range Compression or ...