Questions tagged [integrated-circuit]

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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Subthreshold Analog Accelerator - How is current derived through two sub-threshold transistors in series?

Was browsing the following paper: Fick, Laura, et al. "Analog in-memory subthreshold deep neural network accelerator." 2017 IEEE Custom Integrated Circuits Conference (CICC). IEEE, 2017. When I ran ...
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62 views

Trying to identify an IC; don't recognize the logo. Top markings 4307 and RR623

The only markings on this chip (other than the logo, which I don't recognize) are: 4307 and RR623. This chip is on an audio circuit board, in the sub-woofer of a TV sound system. I did a search in ...
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45 views

Automatic power switching between two DC sources with a switch to charging in the second position

I am designing a circuit which will automatically switch to be powered by a single 18650 when the other voltage source is disconnected. It will use a DPDT switch, the second position of which will ...
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1answer
41 views

Reading signal from 190v magnetic pickup

I am using a magnetic pickup to detect the phase and RPM of a rotating assembly. The magnetic pickup produces a pulse once per rotation when a ferrous interrupter passes the pickup. Dependent on the ...
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97 views

What is needed to convert 2 DisplayPort lanes into 4?

Essentially, I'm trying to connect a source with only two HBR2 lanes to a device that requires four HBR1 lanes. Theoretically, the bandwidth is there. But what kind of an IC would I need to accomplish ...
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69 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
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541 views

TDA7294 100W Audio Amplifier Causing Unexpected Problems

This is the circuit I will be referring in this question: TDA7294 is described in this data sheet. Upper IC with added external components is a well-known circuit and can be found on many websites ...
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122 views

Help to identify 10-pin IC in a GPS unit

I am trying to repair a GPS unit. There was a zener diode (to56 PolyZen protection diode) which had blown off and I had replaced. This is part of the battery charging circuit I believe, as once I ...
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4answers
3k views

How to display 2 digit number in binary adder circuit?

I've made 4 bit adder circuit using 4008 IC. And the sum output of the two 4 bit numbers from that IC was feed to one BCD to 7 segment decoder (74LS47) so that I can get decimal output. But since I ...
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318 views

Rise and fall times typical values for a switching signal in 90 nm technology

I have fabricated NMOS and PMOS devices on simulation using Silvaco software, the fabricated device (CMOS) is shown below. Now, I want to find the dynamic power dissipation of the CMOS inverter by ...
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206 views

How to add two output expressions to calculate the third expression in Cadence icfb 5?

I am trying to calculate the average propagation time carry_TP from carry_TPHL and carry_TPLH which I already got the expression from the calculator tool and works well. Now how do I make the third ...
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1answer
150 views

Resistive on-die termination

It is widely known that resistive termination (e.g. 50 Ohm to ground) is superior when noise is no concern. Specifically in the block diagrams of RFICs I see many 50 Ohm resistors to ground directly ...
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29 views

Unused/floating pins on BTS5016

I plan to use Infineons PROFET BTS5016 in a coming project. https://www.infineon.com/dgdl/Infineon-BTS5016-2EKA-DS-v01_00-EN.pdf?fileId=5546d4625a888733015aa41a5e161129 I will not use the ...
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0answers
21 views

How do determine MOSFET parameters in LTSPICE

I am designing a phase locked loop on LTspice (which I'm new to), but have come across a snag in the procedure: Is there a way to determine the output resistance of a mosfet (as the I'm not able to ...
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39 views

Powering Negative Vcc on Op Amp with no negative supply voltage

I am making a shunt current sense resistor circuit. I will place this circuit on my main PCB board to measure the current going through all the different channels. I have a supply voltage of 12V Vcc ...
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1answer
18 views

Allegro padstack not showing my pads

I have implemented a schematic for an IC (BGM13S32F512GA-V2R) and I am trying to create a footprint but when I try to place the padstacks, they do not appear in the default library... so I went into ...
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1answer
73 views

Pull down through LED

I've built my own version of 8-bit computer based on various examples in the Internet. Once built I started to face some issue with unpredictable memory changes when it was not supposed to. After I'd ...
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37 views

Charge and power distribution circuit with multiple batteries

I’m looking for solution for electric vehicle charge and power distribution system PCB. For some reasons I want to split battery to several Li-Ion packs in separated units (hulls). I see the next ...
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74 views

6-pin SMD identification - top marking B7 AP

I am trying to repair a Garmin Echo fishfinder after moisture got into it, I have replaced the op amp but it seems the 6-pin device above it is also faulty. The trouble is I can't identify what it is. ...
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49 views

Can someone help me in getting to know what is wrong with my Frequency multiplier circuit using 565?

I just learned the working of NE565 and I tried to simulate a Frequency as multiplier using 565 in Proteus , but I don't know why PIN 4 of my NE565 is not giving any output . Its coming plane blank in ...
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1answer
60 views

Transistors and Diodes maximum current per size

As you can understand my knowledge in electronics is limited. I am trying to find throughout the internet a way to find the maximum current I can put through a transistor or diode versus their size. ...
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1answer
139 views

What capacitor needs to be used for a circuit that limits the current?

I have the following circuit that is intended to limit the current that passes through diode D1 In this case, we can see on the graph that the current is limited at 5.31mA We can see on the graph ...
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64 views

How to understand min/max voltage specification in datasheet?

I've seen different types of min/max voltages in this datasheet and not sure whether I've understood them correctly, so I want to double-check it here. As shown below, there two types of min/max ...
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1answer
89 views

Implementing a SN74LS245 Octal Bus Transceivers With 3-State Outputs in Logisim

I'm testing out different circuit simulator programs and I was able to build the integrated circuit SN74LS245 Octal Bus Transceiver in a program called Digital ...
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1answer
91 views

How do I use one output to block an input until that output turns off?

I have a device with two inputs, each with an associated output. I require a means of allowing only one input-output circuit to be active at a time. If a second input is activated while the other is ...
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65 views

Battery Monitoring IC communication via SPI

I am trying to use Max14921(Battery monitoring system) to measure voltages of 16 cells of a battery pack. I have used stm32f103c8t6 as mcu. The problem is that I could never communicate with IC. I ...
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40 views

Pin config for CIS scanner

I've salvaged a linear scanner from an HP scanner cum printer. The scanner senor model is CA4B94. It's got two portions on a single flat ribbon cable. One is for the motor, so I guess it's safe to ...
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0answers
44 views

LED Chaser using counting IC

Total beginner here, I'm trying to build an "LED Chaser" circuit using an IC (CD4022BE) that counts to eight (from zero to seven, and then it wraps around and goes back to zero). Before trying to ...
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1answer
36 views

how to calculate sampling rate for DAC from its data sheet

I need to find the sampling rate of the DAC from its data sheet, could you please suggest me any formulae to find the sampling rate from settling time, no of bits, bandwidth. As I didn't find ...
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2answers
125 views

Looking to identify an old National 8-pin DIP (M8440)

I have a rail of these 8-pin DIP's that I'm guessing was bought 15 - 20 years ago. My guess is that they could be op-amps or comparators. There are 3 printed lines on these chips: N M8440 28930 35-...
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36 views

Resources for learning about transistor configurations?

I'm currently taking a circuits class that discusses various transistor amplifier configurations eventually culminating in building an op-amp. This includes various configurations such as the ...
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55 views

trying to ID a component Diode with PJO489 or PJ0489 and then EXP its a power dioide on a 24vDC psu

Hello I need to Identify this component the ruler is in mm its part of a control board and goes between the 24v input and the negative cathode side of the LEDs on the control panel. The cathode side ...
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75 views

Can anybody identify this SiTel IC

I am trying to identify an IC in order to repair a circuit board. Here is a photo of the IC in question: For reference, the markings on it are: ...
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0answers
85 views

CAN Transceiver Behavior during fault conditions

I was just trying to understand the CAN transceiver TJA1042T behavior during fault conditions: CANH short to BATT CANH short to GND CANL short to BATT CANL short to GND I'm powering on the ...
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31 views

Magnetic Field Strength Measurement at Extreme Temperatures

Hi I have just been given a project at work and we are magnetically stress testing DUTs at extreme temperatures going from -40 Degrees Celsius to 200 Degrees Celsius, I need to come up with a way that ...
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71 views

Drone camera chip identification help

I tried searching for this chip and looking for a similar manufacturer logo but with no succes. I'm trying to get a datasheet on it. It is from a drone that records 720p 30fps video.
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49 views

How is CAM implemented?

I have a book statement: A content addressable memory is a circuit that combines comparison and storage in a single device. I want to know how this is implemented in real world? Sounds like an ...
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1answer
75 views

What to do with unused pins for this ADC?

For my senior design project I'm using this ADC (HMCAD1511) https://www.analog.com/media/en/technical-documentation/data-sheets/hmcad1511.pdf I'm only using one of its four analog inputs - what ...
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1answer
61 views

LT1308A - High Voltage Modification

I am trying to understand how to modify the circuit below to output ~180V at 4mA minimum for a multiplexed nixie design. LT1308A Datasheet - Circuit on Page 17​ Voltage: The 1:12 transformer is ...
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1answer
61 views

I need to find Vin max(Common Mode) and min(common mode) for given circuit.

please let me know how i can proceed with this circuit
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117 views

Howcome there is current flowing through the gate of this transistor?

I have a few conceptual questions: If there wasn't Rg (Resistor between gate and drain), would Vin = Vout then? For small signal analysis, current can flow through the gate (AC) if there's a voltage ...
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1answer
61 views

Logic circuit shutting off at target voltage

I deleted the old question and posted another one because I felt the question is now substantially different. I have a potentiometer connected to a current source and I want the logic chip to cut off ...
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84 views

Jellybean Radio Button logic Chip

Below is an LTSpice simulation of a 'radio button' circuilt. Ignore the bottom button, I am working on a 'reset' mechanism to unlatch any of the other buttons. The idea is that the button you push, ...
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134 views

What are those components?

I am doing a reverse engineer project but I can't find what these components are. Can someone help me? The components have the folowing text on it: IC #1 = 7HUH 7HUH IC #2 = AAPQ AAPQ Here you ...
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35 views

Analyzing pinout of photodiode in a ic

I have dissasembled a pick up head from a CD Rom. I can control the laser and but I also want to "read" the photodiode that senses the light reflected back. It is packaged in a clear plastic and has 8 ...
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171 views

Impedance for TTL Hsync and Vsync Pulses

I'm just finishing up a sync combiner and audio/video PCB. I'm trying to impedance match my traces and I've done so for the 75 ohm RGB lines. Now I'm looking at the TTL level Hsync and Vsync lines ...
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2answers
293 views

How Replica Feedback bias circuit rejects supply noise?

I attached the circuit diagram along with a short description of its working principle. However, it's not clear how the circuit rejects supply noise. It will be great if someone can brief about what ...
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73 views

Identify Quad Flat package

I looked for days trying to find datasheet to this component. I concluded that this is a Quad Flat No-lead. But trying to search the marking code gets me nowhere. I did however find couple websites ...
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484 views

DIY PWM Fan Controller; Speed changing too fast

I couldn't think of a way to explain all this in one line, so apologies for the slightly vague title. I've built a PWM Fan Controller for a DIY Laptop Cooling Pad Project. It theoretically works, and ...
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207 views

Intrinsic glitch of the XOR PORT

Good evening, I'm dealing with the glitch of the xor gate. I read on the book 'Code Design for Dependable Systems: Theory and Practical Applications' that a glitch is generated when more than one ...