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Questions tagged [differential]

Differential refers to any kind of signaling where the signal information is carried by two or more paths and both are required to properly reconstruct the signal. For example, USB D+ and D-

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Differential amplifier circuit, problem with saturation

I have a homework problem regarding differential amplifier. We have a differential amplifier with symmetric supply (i.e. \$V_{CC}=-V_{EE}\$). Emitters are connected to a perfect current source \...
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49 views

Differential Amplifier constant output voltage

SE-Members, The past few days i've been figuring out why my circuit does not work. It is a simple differential amplifier with a gain of 2. The OpAmp is the "TLE2027CDR". My problem: The output voltage ...
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66 views

Finding Drain voltage of current mirror

Below I have a current mirror loaded differential amplifier. Can somebody please Just give me an idea of how to find the drain voltage, vd8. I am stuck because I don't see the relationships that can ...
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1k views

USB differential signal from single pin?

I'd like to make a device similar to the "Digispark", but what really bugs me about those (and most, if not all, V-USB designs, at least all I could find online), is the "waste" of a GPIO pin which is ...
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78 views

Differential amplifier - transfer characteristic question

I have a question regarding differential amplifier's transfer characteristic. If we have a circuit like this (note that \$V_{1}=-V_{2}\$, hence \$V_{cm}=0V\$): the transfer characteristic for \$V_{...
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52 views

Can one voltage output from OpAmp read with two ADC inputs?

this might be a little silly question, but please advise me. I am trying to use two photodiodes (one for the absorbance measurement and one for the source of the light as a reference) and the voltage ...
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136 views

Effects of increasing current on external noise and SNR for analog transmission

This is a conceptual question about long analog signal transmission exposed to capacitive coupling and EMI noise as shown in below figures: simulate this circuit – Schematic created using ...
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48 views

Effect of large capacitor for differential channel in S-parameter simulation

I have created a differential channel with Transmission line and interconnects for simulation. In the real channel, there is 100nF capacitor in between 2 transmission lines. Now the problem is when I ...
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93 views

Gain problem of inverting opamp

I'm implementing the circuit in the schematic on the breadboard. Difference of inputs V1 and V2 is about 5mV. Differential opamp has gain of 17,4 Inverting opamp has gain of 26 First problem: I ...
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115 views

differential routing without GND

I have task that I need to make adapter board which transforms gigabit ethernet connector RJ45 to another connector (not RJ45). I also have power connector to carry power one side to other. I need ...
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1answer
67 views

Finding a range for a common mode signal

I have the question below Here is the figure they are talking about: (Text and images from: "Microelectronic Circuits" book by Sedra/Smith, 7th edition, chapter 9) Here are the answers to the ...
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87 views

Is there such a thing as a fully differential line driver?

I'm looking to find something similar to the TI drv134 (http://www.ti.com/lit/ds/symlink/drv134.pdf), but then with differential inputs instead of single ended. Is there even such a thing? I can't ...
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90 views

What is the physical meaning of the voltage across an inductor in the Laplace domain?

In my Electrical Engineering degree I recently learned how to analyse circuits using Laplace transforms and I know that the Laplace transform of the voltage across an inductor is \$V_L(s) =s*L*I(s) - ...
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240 views

Solving the differential equation in control system engineering

While I am continuing my studies of the Norman S. Nise book about Control System Engineering, and while trying to solve exercises of chapter 1, I noticed that I am out of the scope of solving ...
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69 views

Classic transistor differential amplifier - problem with a single-ended output

I have a differential amplifier like at the pic below: And I am not sure if I am doing everything right. We know that the input signal is a triangle wave with \$ V_{pp}>100\text{mV}\$, no offset ...
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39 views

How can I bias this Differential amp. circuit at the best operating point?

I'm looking to find a way to bias this circuit: I've written down a couple of equations for DC load line(and also DC half circuit): and these two as AC Load line: Rc is given by 1K and you can see ...
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1answer
88 views

Calculating Characteristic Impedance of Jumper Wire

I'm conducting a test of the LTC490 driver/receiver (http://www.analog.com/media/en/technical-documentation/data-sheets/490fb.pdf), using a small incremental encoder. I'll make the connections using ...
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4answers
242 views

How is differential signalling AC?

My initial understanding was that each differential signal (such as those used for encoders, e.g. A and inverse of A) travels along its own line and is unconnected to its inverse, etc. However, I've ...
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112 views

differential ADC with a potentiometer in the positive input and grounded negative input

i have a problem in reading values from ads1672(datasheet). i setup this circuit: the Reference voltage is +3.V (REF5030-TI page) when potentiometer is @ +1.6V (i measured this by multi-meter) this ...
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66 views

what will happen if i don't use amplifier before my differential ADC

i have ADS1672Datasheet from TI. in it's datasheet circuit that is recommended for differential interface is: but i want to remove amplifier(THS4520 datasheet-it's a Fully differential amplifier) and ...
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4answers
1k views

Resistor between differential lines

In the above diagram of a differential line receiver for an encoder, resistors are place between each line and its inverse. I don't see how this would lower the current of each line, so I assume it ...
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145 views

Differential gain on BJT differential pair: not symmetric?

I'm having the following problem. I got to analyze a BJT differential pair with emitter degeneration of both transistors. I calculated the theoretical expressions of my gain and obtained (since the ...
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72 views

Common mode problem with floating sensor

So I'm trying to measure the signal from a potentiometric sensor, that has a working and reference electrode. Electrically it can be summarized with the picture below. Note that my circuit is intended ...
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1answer
144 views

Battery monitor on ADG507 and AD7705

I'm developing a battery monitoring circuit. There is a problem. I launch a survey of all ports ADG507. For the test, I connect only two power supplies instead of the first and second batteries. The ...
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2answers
124 views

How to create a ±20v line driver

A design I am working on requires a ±20v differential line driver, but I can't seem to find such a component. The highest voltage line drivers seem to be RS-485, which aren't high enough. Fully ...
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186 views

Alternatives to RJ45 ethernet connections?

I have a system where two boards need to communicate through a serial bus with several lines --- rates are in the order of up to 3MHz. The boards will be several meters away (say, 3 to 5 meters / 10 ...
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1answer
71 views

Differential gain of an op-amp and feedback

In an op-amp, we know from basic electronic courses that vo = A(v1 - v2) Assuming large differential gain and finite output, we get that (v1-v2) is very very small, ideally zero. In a university ...
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65 views

Is this gain calculated correctly?

In this schematic, if the T5 transistor is off and the T4 is on, what would be the incremental resistances ri3 , ro3. my guess is that: ri3 is : rPi4 + RE5 + Rspeaker. and ro3 is : RE5*(B+1) + ...
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130 views

Common mode and differential mode

I can't understand how to apply common mode and differential mode concepts. 1) I know that if I have two signals v1 and v2, I can always write them as: v1 = vcm + vd/2 v2 = vcm - vd/2 Example: v1=...
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155 views

What kind of protection do these Ethernet “surge protection” diodes provide?

I was considering a network run outside of my home, and purchased a super-cheap "Ethernet Lightning Protector" because there was little to lose, and I wanted to understand its workings. Below you can ...
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70 views

How to measure external voltage differential with single ended ADC?

I would like to measure voltages from external circuits with the single ended ADC from an Atmega324. The plan is to power the Atmega324 with 3.3V and use a 1.024 or 2.048 voltage reference. The ...
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1answer
65 views

Which diagram is better for common mode noise rejection?

I want to us this sensor(107LN type) as in the following signal chain with differential-input DAQ board and a STP CAT6 cable as below: Above the GND of the power supply is local/near to the DAQ. ...
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89 views

How do I create a subtractive or dffferential two channel audio mixer?

I have a desktop mixer made by Behringer (Xenyx X2222USB although I am not using its USB capabilities) which has a line level output that feeds 2 channels of a Behringer USB audio interface (U-Phoria ...
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41 views

Differential stage

I've doubts about this circuit. The 2 transistors are matched in saturation, and the book I follow neglects channel modulation. The author considers as input signals VGS1 = VGS0 + Vin/2 and VGS2 = ...
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111 views

OPAMP - Current sense - unexpected behavior

I want to trigger an interrupt on an ATMEGA328P, when the current of a load is below a certain value. Therefore I designed the following differential amp circuit using an LM358 Below picture shows ...
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29 views

Are differential line drivers “active” circuits?

Some quadrature encoder datasheets describe their outputs as either Differential Line Driver or Line Driver. On closer inspection of the diagrams, they appear to be the same thing (differential line ...
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196 views

What types of signals can a dynamic microphone generate?

And what design generates what type of signal property? For example there are dynamic mics with or without output transformers. Do they differ in the type of signal outputted? Do most dynamics ...
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208 views

Altium buses between sheets on a flat design

I have a really big design to do and I'm having a rough time with buses. I have several doubts I hope someone can help me solve. Can I take a bus between sheets using an Off-Sheet Connector? For ...
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2answers
50 views

How to reduces nonlinearities due to the saturation of one of the BJTs in a differential amplifier

Reading about the differential amplifier in The Art of Electronics, we are introduced to this circuit. It is claimed that the common mode input voltage is limited at the upper end by \$Q_2\$'s ...
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222 views

Routing Ethernet Connections

I am routing Ethernet traces from a Colibri iMX6ULL computer-on-module to RJ45 Ethernet connector (In-build Transformer). The layout design guide says that Ethernet ...
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1answer
93 views

Homemade EEG Circuit Common mode feedback

https://sites.google.com/site/chipstein/home-page/eeg-with-an-arduino/assembling-the-arduino-eeg-circult Hi, I am currently building a DIY EEG circuit using the guide above. This guide is for when ...
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98 views

QI Charging - Differential Manchester encoding

The WPC-Design document reports that: "Transmitter use a differential bi-phase encoding scheme to modulate data bits in the Power Signal." which encoding method do they mean? - Differential ...
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2answers
171 views

Differential ADC input

I have question about adc differential input. Are they not suppose to be positive and negative? Than you get the benifits of differentials signals. In the circuit illustrated the differential input ...
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1k views

100 Ohm diferential impedance microstrip PCB traces geometries in two layer board

INTRODUCTION: I'm aiming to design an Ethernet connected system as a hobby ( ie. plenty of time but not wishing to spend much ). My design constraints would be sticking to a 2 layer 100 mm x 100 mm ...
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2answers
244 views

High Frequency Capacitors in Differential Amplifier

I am curious about the function of two capacitors near differential transistor pair amplifier. The circuit picture is cut out of one of Pioneer's audio amplifiers. This amplifier is basically ...
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6answers
1k views

Comprehension problems with op-amps

The common differential amplifier takes two signals and amplifies the difference between these two signals. I am aware that this difference usually is around a few millivolts or microvolts so, to put ...
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217 views

MOSFET differential amplifiers - difference between configurations

Consider the following differential amplifiers: In the first picture, we have a basic differential amplifier configuration and we can assume that it's symmetrical (meaning M1=M2 and resistances are ...
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1k views

How does the resistor at the tail act as a current source in a differential pair?

Here is a version of differential pair: I can understand the working principle of differential pair above. When Ic1 increases Ic2 decreases that's the thing. And for that to happen the tail current ...
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87 views

Effect of bias resistor value on common-mode rejection in a differential or instrumentation amplifier

In the below schematics a source is coupled to a differential amplifier. Rb is a bias resistor for bias currents to flow: Since in instrumentation amplifiers it is a remedy to add resistors for bias ...
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51 views

What track does this bias current loop through?

Please see the edit. A source is coupled to a diff-amplifier circuit as sown below: The 10k R1 provides a path for base currents to return. But Im confused about the loop taken by ib2. For ib1 I ...