Analog circuits have a range of voltages, rather than just two as in digital logic.

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10 views

Calcuation of Gain // Instrumentation amplifier

I am using an instrumentation amplifier for my project . The differential signal applied to amplifier through sensor is 0-2mV i was wondering if i replace 2k2(R5) resistor with a 5k pot ...would i be ...
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1answer
52 views

Approximating a “Not Connected” pin on an IC with a high value resistor

I'm looking at using this[0] chip as a difference amp. However, I would like to be able to change the gain electronically. For this chip, the gain is set by either leaving unconnected, or grounding, ...
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1answer
44 views

Adding voids underneath analog signal for improved impedance matching

Using a snapshot of an eval board design below as an example, voids are added to the ground plane on layer 2 (green) right underneath the analog signal path on layer 1 (yellow). This causes the analog ...
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0answers
19 views

Is this a valid method for equalizer correction of reflecting sound by a fixed materiel? [on hold]

Think that you have a TV that has its both speakers are placed to each side of the chassis, and their output towards opposite side of the screen, facing to a flat materiel (wall, glass, wooden etc). ...
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30 views

Calculation of signal to noise ratio

Can u please help me answer the following question? An analogue TV signal is sampled at 450x500 pixels and each pixel is digitised at 32 levels of intensity. Picture frames move at a rate of 30 ...
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1answer
43 views

Advantages and disadvantages of reading a current-sense amplifier with different gains on I2C

I am writing an I2C wrapper for the MAX9611 chip. For the current-sense amplifier (CSA), according to the datasheet there are 3 selectable gains (1x, 4x and 8x): When I read the 12bit ADC registers ...
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3answers
43 views

bandpass filter

I was wondering why there is a low end pass ; low end stop; high end pass; and high end stop. I have never taken a analog filter class before, But if I want a bandpass filter wouldnt I just want a ...
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3answers
388 views

Why do we want higher power factor in ac motors?

Here is a simplified 3P electric motor below: This motor is simply combined of three coils facing toward to the rotator (in the center) 120 degree apart to each other. The user wants his rotator ...
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2answers
150 views

Why the audio subcarrier is never transmitted with baseband analogue video signal?

In the era of analogue video, when you needed to connect a local video source (STB, VCR, game console, DVD player, etc.), the most ubiquitous way to do so, next to using an RF modulator, would be to ...
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4answers
802 views

Can a NOT gate be used to achieve 180 degree phase shift?

I have seen from various sources which say that a NOT gate cannot be used to achieve an 180-degree phase shift. Is this claim true? Edit: The question is definitely sounding unclear because that is ...
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2answers
27 views

How to design an auto-adjusted equalizer?

Think that I have a speaker and a microphone. I want to adjust the equalizer automatically depending to the surrounding the system is in with just the speaker and a microphone. How can I do that? ...
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0answers
23 views

Looking for a low offset drift opamp [closed]

I need an opamp for a low frequency sensing application (around 1mHz). Since the device in question may be used outside and thus subject to temperature changes (sunlight, rain, etc.). A variation in ...
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0answers
45 views

RF/voltage clamp/limiter [closed]

I'm looking for a circuit that is called "RF clamp", "RF limiter", "voltage clamp" or "voltage limiter". The example of such circuit is a transistor Q on this picture: However, what I need is a ...
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1answer
49 views

C code for analog read of SD24 ADC (MSP430I2041)

I am trying to read the output of the ADC into an array by taking the output from the memory register but for some reason it is not working, the array values stay as 0: ...
3
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2answers
88 views

Why do we have 2 representations for load (shown below) in a power amplifier?

OR I get confused when i see two different ways to connect load resistor in a power amplifier. Why do we have two such representations (RL in series with collecor Vs RL connected across collector ...
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3answers
114 views

LtSpice computation limitation: Which conditions do affect it?

I am trying to simulate a transistor level circuit in LtSpice. There are more than 200 transistors in the design and a few opamps. Mostly logic structures. The problem is that LtSpice can not solve ...
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1answer
54 views

Op Amp DC multiplier

Is there a circuit (that only uses op-amp and resistors) that performs multiplication between two DC input signals v1 and v2? Similar to the Summing Amplifier but with multiplication.
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2answers
98 views

Stability of Constant Current circuit

we are developing constant current circuit with "High" current rate, about 3A. We are testing the second prototype, the circuit is this: Behaviour its ok, but we have observed, when we set high ...
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0answers
146 views

Thru-Hole Works, SMD Does not

I have been working on migrating a through-hole circuit design that works to a surface mount version. It is a preamp designed by an engineer named Ritter. Here is his schematic: www.ciphersbyritter....
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1answer
60 views

How can I simulate in PSpice the model LM13700?

Hello to everyone and apologies if this question has been asked before, but I am searching more than an hour every time before I post. I want to simulate the LM13700 Operational Transconductance ...
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55 views

Analog input protection

I want to design analog input, and i'm wondering about protection. Analog input should be able to interface: - +/- 10V, - +/- 20mA, (*Okey so let's assume ...
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0answers
19 views

Investigate methods for analog Input Overvolatge fault protection

I have 8 analog input coming from various 5v and 3.3v sensors that have to be interfaced to a 3.3v micro-controller. The main system voltage is 24v-48v , i need to protect the ADC inputs against over-...
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1answer
26 views

Getting started on industrial-grade tools for IC Analog Design [closed]

I want to become an IC Analog Designer but many software to design with focus on professional development is expensive and closed. I am graduated years ago, so I dont have access to the software ...
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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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1answer
40 views

Which informations do I need to calculate the efficiency and horsepower of a 3 phase induction motor?

As far as I know the magnetic force is responsible for the motor rotation. So, horsepower of the motor is mostly related to magnetic flux on the coils (windings). Also magnetic flux is directly ...
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1answer
25 views

How should I do an efficiency analysis of an AC motor driver in LtSpice?

I have two different AC motor drivers and I need to test them for energy efficiency in an analysis tool (I know only LtSpice). But I don't know how to model an AC motor. Driver's circuitries are ...
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0answers
37 views

Help with deciding my layout for EMC tests and SI. Different alternatives.

I am thinking what way would be the best to layout my system in order for it to have the best SI and pass EMC tests. My system consists in two PCBs joint by a flat flex cable (up to 7cm) and these are ...
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44 views

Control from Digital to analog 120v

this is my first time asking question in this forum so forgive me if this is a stupid question. I want to use arduino uno to control the power of a light and I want to have a step in my bulb light so ...
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1answer
46 views

Design of 3g signal repeater [closed]

I am interested in 3g signal repeater and decided to design one. I am planning to just buy 2 antennas and design the amplifier circuit only. my questions are: Should I care much about the antennas? ...
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67 views

Is this circuit possible? using same pins for active low/high

I designed this circuit : The goal is to use A B C ports on a pcb, to perform as: output- active low/high, or as an input. (not in the same time) All Fets are <...
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69 views

chip resistor/capacitor size vs performance for analog circuits

I am designing one four layer ADS1298 (TI) based analog PCB. Signal frequency is about 1.5Hz to 3.79kHz. It is a four layer board with most of the components and traces on top layer and the ground ...
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0answers
46 views

four layer analog board, should I pour ground on top and bottom layer?

I am now designing one four layer analog board for 24-bits ADC based bio-potential signal acquisition. I have ground and power plane on the second and third layers. Most of the analog signal traces ...
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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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1answer
37 views

Startup circuit 0 current mode

I was designing the start up circuit for one of my circuits as shown in the figure below . I was able to understand how a start up works clearly but I stil havent figured out how exactly the 0 current ...
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0answers
36 views

Hardware modules with programmable analog functions (overview) [closed]

Currently I'm working on an overview of hardware modules with programmable analog function on the market. I have already checked other topics here on stackexchange about it but wanted to know if ...
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2answers
108 views

CMOS circuit design: How to implement an interrupt circuit that detects minimum or maximum peak?

I have an input signal sine wave like but comes with a little distortion. I need to give an interrupt when it reaches to minimum or maximum value with an acceptable tolerance. this graph is from a ...
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0answers
42 views

AD620 output question

I am building a data acquisition system. I am using AD620 (instrumentation amplifier), have read data sheet thoroughly and I have used the following circuit which I obtained from internet (image ...
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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 ...
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0answers
94 views

low pass filter

I am working on a data acquisition system and i wish to get data from a pressure sensor . I have designed an analog circuit based on information i have collected which consists of an Instrumentation ...
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1answer
81 views

How to choose the transistor and the resistors connected to it [duplicate]

I am using the regulator TL497 in the case of I(pk)>500mA so I need an external transistor for that but in the datasheet they don't mention how to choose the transistor and its resistors does anyone ...
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190 views

what is the tempreture at which the thermal limit of an amplifier is reached

Introduction: I am upgrading a "power amplifier" that a fellow engineer has designed , my job is to add thermal protection against failure in prolonged use (or operator miss use). The package of ...
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1answer
54 views

I can't find the values of the currents

The picture below is on page 7 of the datasheet of TL497, it is a switching regulator that I use as an inverting regulator (it has an inverting mode) to generate -24V from 12V in input, in the first ...
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2answers
111 views

What should I expect the output of my line scanner to look like on an oscilloscope?

I'm trying to test my TSL1401R-LF line scan camera module by checking the reading on an oscilloscope. I've confirmed that my SI and CLK signal are running normally but the output looks very strange to ...
0
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1answer
36 views

Full bridge rectifier with an RF filter front end

I'm designing a trigger circuit that only responds to a certain frequency. Essentially the plan is to have many of these circuits all buffered and running in parallel such that I can play a mixed tone ...
0
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1answer
45 views

low pass filter and gain calculation

I am working on a data acquisition system project . I have used SMPS power supply and two pressure sensors(-5V to +5V input) and (0-20mV o/p) my analog circuit consists of one op-amp(OP07) and one ...
0
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1answer
33 views

Does anyone on here know why a camera's accuracy would drop when you reduce the delay time after the pulses?

I'm using a TSL1401R-LF Linescan Camera that reads in a 1 X 128 array of pixels. Here is the datasheet. When I used 170-microsecond delay the accuracy was pretty high and the camera's outputted values ...
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3answers
28 views

How does the ELPF and XTAL inputs on the ADV7180 recommended circuit work?

I am looking at the recommended circuit for the ADV7180 by Analog Devices and trying to understand some of the reasoning behind the design choices. I realize some of these questions may be a lack of ...
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1answer
120 views

Output type of incremental rotary encoder

I have been trying to choose incremental rotary encoder for speed control of three phase induction motor. My problem is that I am not sure what type of output should I choose. There is following ...
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2answers
114 views

Attiny85, reading analog values from PIN3, reports 654 on idle?

At first, I am not a hardware professional (starter) so be kind please. I try to reuse a DENON operation board of a DVD-player with 9 buttons with a Attiny85 Digispark clone connected to PIN3 (see ...
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2answers
45 views

Optimizing regulator power circuit for low noise?

I am trying to understand the attached circuit. It's an ADP3333ARMZ-3.3-R7 regulator to provide 3.3V to an analog system. My goals is to have a very low noise regulator and power circuitry for a 16 ...