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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What is this chip in a switching power supply marked IAFSN?

I am trying to identify chip on my constant current led driver. I think it is monolithicpower's chip but couldn't find which one. It's 6-pin, and marked as IAFSN
CnR's user avatar
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PCB ICs simulation models [closed]

I want to simulate the EMC test on my PCB. But I don't have the spice models of the ICs (DCDC, LDO, etc.). How can I represent these items or what is the best way to make an equivalent circuit?
Alan Alan's user avatar
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Doubt about implementing a high-side switch IC

I'm designing a power switch circuit with the TPS27SA08. This is the application circuit (page 33): As you can see, the datasheet says to put protection resistors between the IOs of the IC and ...
Gabriel Corrales's user avatar
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1 answer
52 views

High current/voltage power monitoring in small form factor

I am attempting to build an I/O board to integrate with software I have running on a Raspberry Pi 4. I need the board to monitor voltage and current (power would be a bonus) on 8 circuits running ...
Eric Lindsey's user avatar
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54 views

Determining if a multimeter will damage ICs - How to confirm?

I’m looking for a straightforward way to determine if a particular multimeter will damage sensitive electronics such as ICs. Specifically, let’s say I have a Fluke 117 multimeter and I am trying to ...
KRitiCal_m4ss's user avatar
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42 views

IC 4017 output modification to pulse when released button?

Normally working with 3 output LED, when press button in first time LED1 on LED2 and LED3 off then released button in first time LED1 still on LED2 and LED3 still off. When press button in secend ...
robert's user avatar
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Reusing an old camera's sensor chip [closed]

I just dug out an old camera out of the attic, what seems to be something from the Olympus Cam media lineup (don't remember which version). It's been dinged up and smashed pretty much, but I have the &...
bepispasta42069's user avatar
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37 views

Replacing MAX485ESA IC into a RS485 module but not working

I have been struggling a lot with a MAX485ESA IC I bought from aliexpress. What I want to do is replace the component from a rs485 module. For some reason they don´t work and I was wondering if anyone ...
user2808169's user avatar
2 votes
2 answers
44 views

I have a Li-ion “battery container” and I need help identifying an IC

I have 2 of these battery containers. They house 2 batteries each and have 1 PCB. The IC I need help identifying is an SOT23-5 with marking R3JR with an underscore under all the letters the other PCB ...
Noirher's user avatar
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Time period of V1 and V2 signal the integrator and schmitt trigger

Hello I have tried to solve this circuit several times and i cant figure out what i did wrong. You guys give me some tips. This is circuit with 2 op amp (2 stages) first one is schmitt trigger and the ...
miguel747's user avatar
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Is it necessary to match the operating ranges of the two stages in a two-stage amplifier

I'm trying to design a two-stage amplifier as shown below. What confuses me is that - is it necessary to match the operating range of the two stages (ie. Vocm of the first stage is within the Vicm ...
George Guo's user avatar
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How to test the stability of an OTA in this case?

I am designing an OTA for a current buffer (images from Analog Design Essentials): The OTA is just used to provide a high gain, to regulate the voltage on RE. My question is, how to test the ...
George Guo's user avatar
1 vote
1 answer
58 views

Modified sine wave inverter analysis

I would like to analyse this circuit, but I do not understand how this circuit works. J10 connector is connected a three wire, center tapped tranformer. What should be the input of the transformer to ...
Serkan Kaya's user avatar
1 vote
0 answers
25 views

How to design for an impedance matching device for non-TEM waveguides?

Let us start from the assumption that we are working with RF waveguides which do not support TEM modes. In such scenario, there is no physical (only formal) meaning to an equivalent voltage and ...
Bidon's user avatar
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Can inputs be at the source/drain of MOSFETs for digital logic circuits?

There is a question in my University exam requiring us to design a logic circuit for the following logic using the smallest number of transistors: I was trying to optimise at the gate level by using ...
ZHZ's user avatar
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2 answers
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Is the communication between memory controller and RAM serial?

I used to think that the communication between memory controller and RAM is parallel since we know that a RAM stick has multiple pins, just like this: But then, from Wikipedia article on memory ...
Noob_Guy's user avatar
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What is the standard procedure for analogue IC tapeout?

This is probably a very broad question and I will try to be more specific. I'm asking this question to get a sense of the gap between my knowledge and a 'successful' tapeout, as I've heard many people ...
George Guo's user avatar
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1 answer
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Rds(on) value of MOSFET constant current LED driver IC

I am testing a non-isolated APFC buck constant-current LED driver IC (model no.: BP2362XH) in my LED driver circuit. It operates in critical conduction mode (according to the datasheet). There are a ...
Sanjaya Wijewardana's user avatar
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1 answer
36 views

Measurement of small signal voltage of switched capacitor dc-dc converter

I have a short question. I have a Switched capacitor dc-dc converter which I want to obtain the magnitude bodeplot in dB manually rather than using AC_analysis in the simulation (To understand how to ...
Kwok's user avatar
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0 answers
130 views

Simulation of transimpedance amplifier in LTspice

I am trying to simulate a circuit that is presented in a research paper by Dr Behzad Razavi. I am using LTspice for the simulation (please see the attached image and netlist for the circuit). I am ...
Masood Salik's user avatar
1 vote
2 answers
99 views

Which part on the circuit board has the software or firmware? [closed]

I am having difficulty to locate which part holds the firmware or software to make the board function properly. The board is used as a control for a 375 kW drive. I replaced the board with a new one ...
عمر العفيف's user avatar
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1 answer
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Unable to model Transresistance amplifier with feedback correctly

I spent the whole day trying to figure why transresistance amplifier modelled with z-parameters does not match with nodal analysis results but I sill can't figure out. I desperate need help on this... ...
Matt's user avatar
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1 answer
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Identify SOT23-5 IC marking 834sx inside mains power adapter

I have SOT23-5 SMD IC with markings 834sx From inside 17V power adapter: I need help identifying that IC used in the mains power adapter.
Berk 's user avatar
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2 answers
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h-parameter model for non-inverting amplifier

For a standard non-inverting amplifier as below: With nodal analysis, I got $$\frac {v_o} {v_i}=\frac {R_EZ_o+aZ_iR_E+aZ_iR_f} {R_ER_f + R_EZ_i + R_EZ_o + R_fZ_i + Z_iZ_o + R_EaZ_i}$$ However, with ...
Matt's user avatar
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0 answers
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Parameters for BJT spice-model

I need to make a spice model for BJT according to the stress test mode schedule (this is the current density and collector-base voltage). What parameters of the G-P model are responsible for these ...
Alex's user avatar
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What are the necessary conditions to prevent latch-up problem for Oscillators?

In his chapter on oscillator design, Razavi discusses the issue of latch-up and proposes several methods to eliminate it. However, he doesn't provide explanations for these methods. Could anyone ...
Tong Su's user avatar
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1 answer
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LS19-S, what to do with unused inputs>

I am using a LS19-s switch debouncing IC, and the datasheet does not specify what to do with unused inputs. I know for CMOS chips it standard to ground unused inputs and for TTL chips the unused ...
Zackery Fleming's user avatar
1 vote
1 answer
83 views

Determining the type of defective part on the PCB

I have a monitor that won't turn on. I opened it and found a burnt part on the board, but I can't identify that part. I want to know what this part is and what it does.
imna's user avatar
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2 votes
0 answers
82 views

Negative PSRR of Two-Stage Op Amp

From page 4-9 of this lecture note https://pallen.ece.gatech.edu/Academic/ECE_6412/Spring_2004/L180-PSRR-2UP.pdf, it gives example on how to model a Two-Stage Op Amp to find the PSRR- when \$V_{Bias}\$...
Matt's user avatar
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78 views

Can anyone identify this surface-mount sensor?

The picture shows a part of a brushless motor. The sensor looks like it may be a Hall-effect sensor, but I'm not sure. Can anyone help me identify it?
HNLinh's user avatar
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1 vote
1 answer
155 views

Does pole-splitting narrow or widen the bandgap width?

Razavi gives the answer of why the compensation capacitor should not be placed between the gate and drain of M3 transistor. Below are the quotations of his question and answer: Question: Explain why, ...
Tong Su's user avatar
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1 vote
1 answer
108 views

How is the boundary of input CM level calculated?

I will briefly state my understanding of the following equation, and then pose three questions at the end. Equation (1) (2) refers to the circuit in the first picture, Equation (3)(4)(5) refers to the ...
Tong Su's user avatar
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-1 votes
1 answer
53 views

I need to find IC marked ID9MU

I can't find this IC in the red box
Mohamed Ehab's user avatar
0 votes
1 answer
68 views

Datasheet of camera autofocus driver IC

I have a camera lens with auto focus. I opened it and found a tiny (2x1 mm) IC. A search on Google for "auto focus IC" showed it has 6 pins (GND, Vcc, SDA, SCL, and 2 outputs for the voice ...
Thedark's user avatar
1 vote
1 answer
93 views

Identify part marked 'Z14' or '214'

Need help identifying the 6 pins SMD IC. This is a push button controller for servos with LEDs to identify position. Appears to say either Z14 or 214. Close up: Bottom: Original image: https://i....
Chris Schlodder's user avatar
0 votes
1 answer
69 views

How to compensate this circuit? [closed]

I'm using the circuit above to control the common-mode voltage of the 2 resistors. M16 is a current source. The OpAmp controls common-mode voltage by adjusting the resistance of M20. I need to adjust ...
George Guo's user avatar
0 votes
1 answer
60 views

I can't find this IC marked 54b8

What are the IC with the marking "54b8" in the photo?
Kareem Elzeftawy's user avatar
0 votes
1 answer
63 views

I can't find these ICs marked DK=H6G, AW=JFM

What are the ICs with the markings in the photos?
Kareem Elzeftawy's user avatar
0 votes
1 answer
106 views

I can't find this IC marked 9A1Ky

What are the IC with the marking "9A1Ky" in the photo?
Kareem Elzeftawy's user avatar
0 votes
2 answers
62 views

Making a timer on delay and off delay without microcontroller

I am new and want to make a compact circuit without a microcontroller. The idea is when you push the button/switch, it will delay the timer for at least 6 hours. After that, it will activate the motor ...
Spacing99's user avatar
0 votes
2 answers
74 views

For a MOS transistor, why is the maximum voltage of it be \$V_{dd}-V_{ov}\$?

Razavi stated that the maximum output swing at X or Y is equal to \$V_{DD}−(V_{GS}−V_{TH})\$ as shown in the following picture, the second picture is the Fig.4.3 I don't understand why the equation ...
Tong Su's user avatar
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3 votes
1 answer
218 views

Why it is difficult to use two-stage op-amps at high speeds?

Razavi motivated the design of the Gain-Boosting configuration by stating that, The limited gain of the one-stage op-amps studied in Sec. 9.2 and the difficulties in using two-stage op-amps at high ...
Tong Su's user avatar
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0 votes
1 answer
71 views

Identify 5 pin SMD component marked 'VTU'

This 5 pin SMD component is placed on Growatt 5KW control card (solar inverter). Marking code is VTU. What type of component this is?
Zahid Hasan Joarder's user avatar
0 votes
1 answer
103 views

I can't find these ICs marked Z20hD, K00 JB, S2UI [closed]

What are the ICs with the markings in the photos?
Mohamed Ehab's user avatar
2 votes
2 answers
100 views

Why does shorting the drains linearize the transconductance of the differential amplifier?

Why, by shorting the drains in Fig \$14.15\$ in this manner, will it allow the \$G_m\$ plots to add together? What will happen to the \$G_m\$ plot if we swap the shorting transistors, i.e., shorting ...
Tong Su's user avatar
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0 votes
2 answers
72 views

Electrolux Induction Stove Board IC bricked and 1 Resistor too [closed]

An integrated circuit has blown and how can I workaround that. Can I install other similar looking IC or also maybe directly solder some wires somehow to make the board circuit close.
osiris89's user avatar
1 vote
1 answer
67 views

Why is no data written to the I2C bus using this PIC12LF1822 code?

I am trying to implement a basic I2C Master write sequence for a PIC12F1822 Microcontroller. I am programming the device using the PICKit 3 programmer. I have heavily simplified the code to isolate ...
BlueShoes's user avatar
0 votes
0 answers
76 views

What is this 6-pin SMD from an ethernet switch?

Can anyone please identify this 6-pin SMD integrated circuit or what it does? I could not find it by the code written on it. It is from an ethernet switch and I need to replace it. The switch accepts ...
Hossein salamat's user avatar
0 votes
2 answers
201 views

CD14538 and MC14538 are advertised as interchangeable, but one works on my board and the other doesn't

I am repairing a board that originally uses MC14538 (dual monostable multivibrator) ICs. Since these are obsolete, I planned to use CD14538s, whose datasheet claims that the two are interchangeable. ...
Jean's user avatar
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2 votes
1 answer
111 views

Is this the leakage current of a MOSFET?

I'm trying to understand the leakage current characteristics of a 130nm PDK in Cadence. I set up a testbench by grounding the gate and source terminals of a nmos FET, and setting the drain voltage to ...
George Guo's user avatar

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