Questions tagged [analog]

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

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External Current Sourcing Sensor parallel to PNP BJT

I have Biased the transistor Q1 in active region as shown in the following diagram. I have Sensor which outputs 1-10ma and needs to be connected across parallel as per the following diagram. the ...
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2answers
154 views

Splitting 0-10V Analog signal from 1 AO to two different set of Ventilators to regulate speed?

Is it possible to take 0-10V signal from analog output and split it in parallel to two different Analog inputs ..to regulate speed of two different sets of ventilators? Or do i need some special ...
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60 views

Is ok to use a CMOS Analog multiplexer with voltage from a sensor as an input?

So, I got an analog circuit with an IR sensor that generates a voltage in output. The voltage is a measure that must be read with a microcontroller (I use Arduino Zero). This is the sensor. As you ...
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72 views

Thermistor probes wired in parallel

I have three temperature probes. Each probe consists of four sensors (NTC) with a common wire. The sensors wires are connected together and the common wire for each probe is available: The wiring ...
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1answer
25 views

Providing input to clipper circuits

I was reading about diode circuits for clippers According to my observation, I felt only sinusoidal signals are used to give the input. So, my question is can any wave,for example, square wave, ...
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33 views

How can I convert FMCDAQ2 Analog Devices Data Acquisition board from AC-Couple to DC-Couple input?

This is a Data Acquisition FPGA board from Analog Devices: https://wiki.analog.com/resources/eval/user-guides/ad-fmcdaq2-ebz/hardware#picture_and_main_components We have to use this card in a project ...
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949 views

What is the function of CLKREQ and PEWAKE when those are used in PCIE?

I could understand The CLKREQ# signal is used by the L1 PM Substates mechanism. And PEWAKE signal is used to wake up the ROOT COMPLEX(RC) during the sleep mode. And these two signals are bidirectional ...
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73 views

Opamp output on loaded and unloaded cases

I have a design project to rotate a motor. In order to do that, I have designed a very simple but smart circuit. However, in signal comparison stage, if it is unloaded, i.e. not connected with the ...
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68 views

How to find the RMS value of a sine wave with DC offset and retain the negative sign

I'm trying to build a Quadrature setup where an input signal is mixed with a reference signal that is in-phase and another one out-of-phase by 90deg. The idea is to extract the real and imaginary ...
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2answers
95 views

Dual slope edge detection for a phototransistor

I want to detect sudden changes in light level using a phototransistor. The goal is to transmit information optically using the timing of the transitions, ideally using an LCD screen. LCD transitions ...
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1answer
128 views

Parasitic insensitive switched capacitor circuit

I'm trying to simulate the parasitic insensitive switched capacitor circuit shown here: I am using cadence virtuoso. My input is a sine wave of 1 V amplitude, 0 DC and 1 kHz frequency. I am using ...
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89 views

How to get analog input using PIC12F675

everyone. I'm new to embedded systems and I want to program a PIC12F675 for a project. I have most of the code figured, and there is only one thing left. It's the analog input. I tried some tutorials,...
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51 views

Microphone input buffer circuit not behaving as in simulation

I have designed a circuit to interface the SPW2430HR5H-B microphone into a dsPIC33 ADC pin. The circuit has an active LPF and uses the AC coupling capacitor as a HPF to get an output on the frequency ...
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240 views

Difference between cutoff and subthreshold region of nmosfet?

I understand that some current does flow from drain to source when Vgs is below vth and Vds is greater than zero. But why this has a different name?(and a different region in Cadence virtuoso tool) ...
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1answer
115 views

How to avoid signal interference between 5 volt analog video signal and 415 volt servomotor and drivers, when working nearby

I am using a 5V borescope analog camera (Sony CCD, PAL/NTSC) for visualization purposes. This camera has a 20 meter 4 core wire, which transmits power and video signal to and from the camera. Along ...
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1answer
182 views

Arduino mega 2560 Analog max reference voltage

Each time I power up the Arduino, the max reference voltage which is represented by 1023 changes. I observed this by measuring the voltage from the Aref pin each time. Is there any internal function ...
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61 views

How to find the right (external) ADC for an Arduino project?

there is a specific project I am trying to tackle using an Arduino, but I'm fairly new to this topic, which is why I would appreciate your help on choosing the right components and overall circuit. I ...
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1answer
67 views

Pressure sensor for breathing

Could anyone suggest the type of pressure sensor I need to measure human breath? When someone blows into the device I want to measure them blowing in and also sucking out. Could this be done with ...
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0answers
67 views

Avoiding signal interference in a cable that carries video signal and sensor signal

I am using a 6 core shielded cable. In this 3 wires are used for a sensor and 3+1(shield) is used for a analog camera. All the cores take DC supply. Sensor(3 wires) (+)24 volt supply, (-)minus, ...
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1answer
170 views

What is topology of feedback for circuit?

I am confused between Voltage Shunt and Current Shunt Also mention why R2 shouldn't be considered as feedback as it is emitter degeneration resistance Consider the above circuit why can't I consider ...
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43 views

Improving effciency in medical implant with load switching

I'm trying to design and simulate the Q-modulation technique for a body implant. The technique involves two loops: one outside the body, with resonating LC tank producing a big voltage. Another loop ...
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1answer
40 views

Earbud wire color shielding is red/white and yellow/black, which are the grounds?

All wires are white metal, no copper, and they run side-by side and not one inside the other, ground. I'm trying to - well, will - hack my laptop via the headphone jack (yuck) into a Yamaha YAS-71 ...
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1answer
55 views

Voltage comparison circuit (Voltage level operated switch)

I am trying to implement a voltage level detection circuit for e.g. I have 60V power supply and I need to check that if the input voltage is 1.5V or higher to turn on DC/DC or just high signal so I ...
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34 views

Circuit with both common source & common gate

I'm trying to calculate the following cirucit's voltage amplification \$A_v= \frac{V_{out2}}{V_{s2}}\$ using the known topologies of common source & common gate. On one hand, I can see that on ...
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43 views

Wire shield when using connector for strain gauge sensor

I have made strain gauge sensor with 1 strain gauge. Thet gauge is in "bottom" part of Wheatstone brigde (one strain gauge terminal is signal, second is connected to ground). I'm using Sommer CICADA ...
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156 views

Line level audio output from headphones level output

I am new to analog audio interface design. I am trying to get a line level output from a amplified headphones level output. I want both of the output to work at the same time in order for the user to ...
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34 views

Gain and output impedance in a differential amplifier

When looking at a differential amplifier: Why does gain increase when the output impedance is increased? For example, replacing a differential amplifier biased with resistors for an active load (...
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67 views

I have two inputs which are switching between 12V and a GND. I want to have a wire where I always have 12V and one with where I always have GND

As in the title. Assumptions : The inputs are switching at the same time. If one is 12V the other is GND and vice versa. I have tried coming with a solution on my own : using an OR port (diodes) to ...
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2answers
113 views

Variable Current Amplifier for Fan Control

I'm working on a project where I need to vary the current supplied to a DC fan. I am currently trying to use a BJT as a current amplifier to amplify a low current analog output (0 to 100 mA to vary ...
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80 views

Analog signal driver

I'm trying to create a driver for an analog signal. The signal will be an analog signal from the DAC that will be converted from 0-3V3 to 0-1V. I want to switch this signal on and off using a digital ...
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1answer
66 views

Resistive Divider

In a nutshell, the book says However, I don't see how that's true. If I re-draw that resistive sensing part as follows: Surely, isn't it just Why do I have a minus instead of a +? EDIT: I just ...
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70 views

Reading Digital and Analog Signal from Different Sources with Arduino

I am using an Arduino to read signals from 2 different devices. (This is an automotive project so all 3 are powered by the 12v battery of the car). The signal from one of the devices is a digital ...
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155 views

How to detect source presence using LTC4412?

I'm using 2 power sources as shown in below picture. The status pin is suggested to pull HIGH to VCC(which can be the adapter input). As mentioned that Status pin OUTPUT is LOW when Wall adapter ...
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2answers
89 views

Analogue signal generation: Which is better Standalone or PWM DAC?

Most controller/processor come with PWM output and integrated standalone DAC module.... My need is to generate 50/60Hz analog signal for testing purpose! Which would be the good choice PWM DAC or ...
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1answer
245 views

Working of NMOS as a capacitor

I came across instances where NMOS was used as a capacitor in analog circuits. This is done by shorting the drain and source. The drain/source acts as one terminal of the capacitor while gate acts as ...
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76 views

TI Photodiode Trans impedance amplifier Circuit?

I am designing a Photodiode(Vishay/ current of 15uA) circuit amplifier (TI ) in SIMetrix. frequency of Photodiode is 1MHz. I choose an Amplifier from TI as OPA355_Q1(spice model imported from TI) and ...
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2answers
250 views

Digital to Analog (DAC) design with MOS transistors

I am looking for a DAC design wıth NMOS and PMOS transistors as a part of a project, most of the DAC circuits that I found were builted with R-2R or with capacitors. But I need a design with MOS ...
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1answer
50 views

Analog Sensor output signal accuracy and sensitivity

I have to decide between 2 load cell models. the only difference between the two is that the output on one is 2mV/V and the other is 3mV/V. Both are rated at 2.5klbs. Which one of them would be more ...
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1answer
47 views

Voltage Circuit Switch with BJT

I have Found One Circuit Which acts as Switch to Pass 15NV (15 Negative Voltage) to Opamps Negative (-VCC) Supply But I am unable to understand its working . Why Two NPN are used in this Circuit ? ...
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142 views

Can you generate a pure sine wave by mixing a fixed frequency sine wave with a variable frequency square wave?

Let us suppose I don't have a DDS available, and instead I have two square wave clocks with frequencies of my choosing. I have the impression that creating a wide bandwidth (multi-decade) sine wave ...
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190 views

PCB Grounding Plane Review

I am reviewing a 6 layer board that has analog signals on the left and right side of the board. I have always read that analog circuitry should be grouped together for easy plane segmentation. ...
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73 views

Differential Amplifier Exam Problem

I am lost with how to approach part C and D of the question. In fact, I need some intuition with how to tune a differential amplifier.
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1answer
33 views

What is the reference for High side IC with internal mosfet driver

In the schematic below (like many other) the IC (switcher) is on the high side. I was really curious how the internal circuitry of such an IC is referenced to. My first thought was that everything ...
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1answer
48 views

Trigger an analog SPDT switch ONLY with a long button press

I'm currently working on project where I need an analog SPDT switch to be only triggered by a long button press. Long story short I'm trying to make a module that would fit inside a Game Boy. This ...
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1answer
49 views

Why does DAC INL follow a pattern, with peaks repeating at certain specific intervals?

INL curves seem to have relation with "digital" effects from the codes,like a major carry transition. Could someone help me understand an electrical or rather an analog, explanation for this occurance....
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1answer
115 views

Achieve -12~12V PWM Signal isolate

I have used IL300 to isolate 0~5V PWM signal before and it works great. The circuit is shown below. But now I need to isolate -12 ~ +12V PWM signal. Is there any possibility or suggested circuit to ...
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1answer
130 views

Problem with Vout of Honeywell ASDX Analog pressure sensor

Few months ago I decide to bought an absolute pressure measure system using a Honeywell ASDX differential analog pressure sensor (Model: ASDX ACX 030PAAA5). The datasheet of this type of sensor ...
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1answer
295 views

Simulating 3 phase mosfet bridge with LEDs

I have a commercial 3 phase BLDC motor driver board (TI DRV8323 BoostXL) and I want to write a firmware from scratch. For testing, I want to make sure I open/close the mosfets in correct order. I am ...
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1answer
27 views

LTC1668 - COMP1 & COMP2

The LTC1668 is a 16-bit, 50Msps differential current output DAC. The datasheet say that the COMP1 pin and COMP2 pin should be bypassed to VSS (-5V) with 0.1µF. COMP1 is for Current Source Control ...
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1answer
120 views

LTC1966 Sallen-Key post-filtering application question

Just a quick question about an application circuit in the LTC1966 datasheet. Figure 13 on page 18 shows a third order (when considering output resistance of the LTC1966) Sallen-Key filter, with a ...

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