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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3answers
281 views

Offsetting a differential amplifier to remove the need for a dual supply

I'm developing two similar circuits that will enable me to differentiate the X and Y coordinates from a segmented photo-diode (Four segments). These coordinates will be dependent upon the position of ...
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4answers
421 views

How to apply 180 degrees out of phase signal at inputs of differential amplifier in laboratory when only one function generator is provided in lab?

In this differential operation experiment, two input AC signals have to be applied to the bases such that they are 180 degrees out of phase with each other, but I am not sure how to invert an AC ...
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1answer
125 views

RMII and diferential pairs

I am initializing my differential pairs in my schematic. I have a RMII port and i can't find information on which signals are differential pairs. Maybe IND*, OUTD*, NON? Here are my signals : Thank ...
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1answer
82 views

Why am I getting no gain from this differential circuit?

I am having difficulty understanding why I am getting unity gain from the circuit below. Before I added the common emitter stage, there was a gain of around 150, and I wanted to add another 10 X gain ...
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6answers
96 views

What is the need for amplifier stage in a data acquisition hardware?

Below is a typical data-acquisition block diagram: As you see above after the multiplexer there is an instrumentation amplifier IA. This IA stage can be shown in more detail as below: Since this is ...
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1answer
135 views

A question about understanding a BJT differential amplifier?

I'm trying to understand how a differential amplifier rejects common mode noise and amplifies the differential/normal mode noise. For that I use the following circuit topology and simulation: When ...
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2answers
93 views

Options for Differential transmission of digital signal

I have a setup in which several (3 or 4) microcontroller boards (locally, they are within 3 to 5 meters away from each other) need to be "perfectly" synchronized, so we're broadcasting a "master clock"...
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1answer
164 views

What is sense terminal/pin in differential amplifiers?

I sometimes encounter a connection terminal called AISENSE in some data acquisition boards. I also see a pin called SENSE in diff. and Instrumentation amplifiers. An example(look at the pin called ...
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37 views

Modelling this differential ended system for SPICE simulations and grounds

Considering above illustration, imagine a voltage measurement by a voltmeter where the voltage is coming from a differential output device i.e a device which sends mirrored voltages according to its ...
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2answers
1k views

Effect of swapping positive and negative traces in a LVDS differential pair, for both clock lines and data lines?

For an LVDS signal, I am trying to understand what will happen if the transmitter's positive and negative sides of the differential pair get swapped on their way to the receiver. In other words you ...
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2answers
3k views

Differential to single ended circuit

I have a differential signal up to 1.5 MHz and have to transform it to a single ended signal. I have found this amplifier which has a BW of 2.2 MHz and should therefore be okay for this task. The ...
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2answers
141 views

Differential Amplifier circuit

I wanted to transform a differential signal to a single-ended signal using a differential amplifier. When I am reading the datasheets for fully differential amplifiers there are just single-ended/...
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4k views

Differential to single ended

I have a differential signal ranging from 0 to 2 MHz and need to transform it into a single-ended signal. I found out that there are 3 methods: Transformer Amplifier simply ground the negative part ...
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2answers
268 views

Differential equation from a Wheatstone bridge with Inductor

I've been given the following circuit and been asked to give the differential equation showing the relationship between \$u_e(t)\$ and \$u_a(t)\$ The differential equation should be in the form $$\...
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2answers
591 views

Ac voltage measurement

Hi! I got a simple problem. My objective is to measure voltage and power factor of a 16V AC through a differential ADC (ADS1115) that measures voltage difference between 2 channels. I only managed ...
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1answer
130 views

Use of virtual ground to split ground loops?

So I have a "broadband" signal (DC-5MHz) which I'd like to send over coax cable to two other circuits referenced to the same ground. Simply floating the other two circuits is not an option for ...
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146 views

Ouput impedance of a balun

I am using the CC1110 RF IC and I am having trouble when matching the differential RF output impedance with the antenna. The datasheet states that the differential impedance seen from the RF output ...
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1answer
498 views

Power planes splits effect on differential pairs routing

I'm routing a differential pair (rs485), and I'm wondering if I should avoid routing it above a power plane split. I read about the undesired effects that a ground plane split can have over those ...
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2answers
97 views

Differential pair impedance vs temperature

Does anyone know if the differential impedance, say of a PCIe bus, can be affected by really cold temperature, like -50 °C? I have a wifi card that does not work from -30 °C and colder. I am wondering ...
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82 views

Multiple differential amplifier

I have a small problem. I want to design a "multiple differential amplifier". With this, I mean a circuit that, given the inputs and outputs: simulate this circuit – Schematic created using ...
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1answer
306 views

Differential Amplifier with Global Negative Feedback

This question refers to audio amplifier design, using BJTs only. I am wondering how differential stage amplifier plays an important role in hi-fi audio amplifiers. According to this book (where ...
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1answer
57 views

Finding a suitable ADC driver (SE to DIFF VCM+-0.5V)

ADC:ADC3424 The input is specified to be differential with each input swinging symmetrically around +-0.5V (i.e. 2Vpp with 1V input and G=1). I can't seem to find a suitable ADC driver for this. TI ...
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1answer
757 views

AC coupling caps on USB interface [duplicate]

Does anyone know why AC coupling caps should be implemented in USB3 interface while it's not required in USB1/2? Anything to do with transmition speed, encode method?
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2answers
194 views

pnp differential input stage features

In one book I found that snippet. Can anyone explain me why the input may go below 0? There is a text with that pic: "The limit here is one diode drop below ground, at which point the base of Q3 will ...
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1answer
60 views

Circuit biasing problem for differential pair circuitry

How to bias this differential circuit correctly ? Additional Information: Vdd = 3.3V and This differential circuit is connected in negative feedback manner to a CMOS inverter. Note: this is not ...
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2answers
484 views

Measure Battery Current via Shunt

I'm working on a project where I'm measuring the current into/out of a battery (currents may be as high as approximately 150A, and I'm not aware of any hall effect devices that are continuously rated ...
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1answer
161 views

How can I make an amplifier such that its gain increase proportional to the input difference

I want to make an amplifier that has a gain which increase with the difference between the inputs. For example: If I have 2 volt difference between two input of the amplifier will have gain factor ...
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3answers
3k views

Understanding the necessity of Tail Current Source in Differential Amplifier/Simulation (SPICE)

My objective is to understand the need of the tail current source in a differential amplifier. So, to understand the significance of current source, I tried simulating the behavior with and without ...
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1answer
124 views

A question about differential measurement system

Below represents a differential measurement system for a data-acquisition: As far as I understood, in a differential measurement system neither the outputs of the signals nor the inputs to the ...
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1answer
52 views

Low Impedance Node Ground Approximation

In Microelectronic Circuits by Sedra/Smith, the authors perform small-signal analysis on a basic active-loaded MOS differential pair amplifier. In attempting to find the amplifier's short-circuit ...
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2answers
1k views

A basic level question about grounds in a differential amplifier circuit

As far as I know, voltage is a defined with respect to a common ground in circuits. So if there is a source and a receiver/amplifier; then they should have a common ground if we want to talk ...
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1answer
64 views

What is current in RL-circuit? [duplicate]

When t<0 Components in circuit are Jt = 3 A, R1 = R2 = 2 Ω, R3 = 4 Ω ja L = 10 H At t=0 switch K will be closed and i need to figure out what iL(t) is when t=4 So i tried to figure out iL(t) ...
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3answers
199 views

Differential Amplifier with Hard Limiting

I'm currently going through RF Microelectronics by Razavi. In chapter 3 he presents an example where the following signal is applied to a differential amplifier with a tail current source. $$Acos(...
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1answer
70 views

What is i(t) from circuit with differential equation?

When t<0 Components in circuit are Jt = 4 A, R1 = R2 = 2 Ω, R3 = 4 Ω ja L = 10 H At t=0 switch K will be closed and i need to figure out what iL(t) is when t=4 So i tried to figure out iL(t) ...
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3answers
340 views

What is the practical advantage of using mirrored signal outputs eventhough what matters is balancing the wires?

Some devices output differential outputs since both wires carry varying signals which are mirrored. Most devices on the other hand output one signal carrying and one GND wire. There is also ...
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1answer
193 views

POE power will not interfering on Data travelling on Ethernet , Whats the logic

I was design POE+ circuit , so I read lot of articles on POE(power over Ethernet) IEEE802.af 15.4W on PSE side , For 10/100 base T can use Alternative A method where it use to deliverer power on data ...
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2answers
3k views

Differential Pair Length Matching for DP83848I

I'm looking in the datasheet and layout guide of the DP838481 but I can't seem to find where it talks about length matching for the RX and TX differential pairs. It only mentions length matching for ...
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4answers
165 views

THS4521-HT: Op-Amp giving negative differential voltage

Can someone help to explain where I get wrong with this schematics? I use a differential op-amp THS4521 and want to measure the differential signal coming from a pressure sensor (transducer). The ...
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2answers
579 views

Remove DC offset from differential output, rotary encoder

Op-amp in my circuit is accepting differential sinusoidal signal, that swings around 0 V with 1 Vpp. It is configured as a comparator - swings to upper rail when the signal is positive and swing to ...
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1answer
552 views

DDR4 differential pair routing guideline

I have a question about the DDR4 trace routing on the server main board. For clock and DQS signals, are they both considered differential signals? I checked the Intel PDG; it shows that two specs ...
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2answers
5k views

Do USB Data Wires (D+/D-) have 90 ohm differential impedance and single ended 45 ohm impedance to ground and if so how is this made?

I understand that USB data transmission is done over various speeds where transmission line effects could come into play(max 480Mbps which means a max frequency that is much higher considering the ...
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2answers
307 views

Trans-impedance Amplifer with a Fully-Differential Amplifier

I'm designing a trans-impedance amplifier (TIA) for a fairly fast Avalanche Photodiode (APD), to amplify pulses of 1mA that last few nanosecond. I found a solution that have just enough bandwidth with ...
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4answers
104 views

Nonlinearities in Fully Differential Op Amp

I am trying to construct an amplifier circuit using a fully differential op amp (THS4503) to interface with an ADC (ADS5232). I will be reading a 0-5V sensor, which needs to be converted to a 1Vpp ...
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2answers
162 views

Differential amplifier and random signals

I would like to ask if I can amplify a random signal (picture 1 right hand) with a differential amplifier(picture 1 left hand) and how this will work.I know how the differential amplifier will work ...
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43 views

Variable differential amplifier

I made this scheme: simulate this circuit – Schematic created using CircuitLab Gain of this differential amplifier is constant and equal to 2. I would like to have possibility to substract ...
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1answer
289 views

BJT Emitter Degeneration Rπ

I am a bit confused about this differential base-emitter resistance. I has been said that r_pi doesn't have much influence on small signal input impedance, when CE with emitter degeneration is used. ...
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2answers
945 views

Differential ADC and Common Mode Voltage

I am trying to understand a little bit more about common mode voltage. I am working with a particular MCU, the TMS320F28377S, and it has a common mode voltage requirement for its positive and negative ...
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2answers
184 views

Interfacing an LVDS driver with an LVPECL receiver

I'm trying to understand how the below circuit allows interfacing LVDS levels with LVPECL levels. Assuming: Driver: Voh = 1.4V, Vol = 1V, Vcm = 1.2V Receiver: VBB = 2V After the transmission ...
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1answer
221 views

10BASE-T Layout Guidelines

How critical are parameters like trace length matching, differential impedance, vias, etc. when designing a 10BASE-T only application? I know that due to the reduced frequency, there is a larger ...
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2answers
195 views

RC integral and differential functions, Schmitt triggers. How does this circuit work?

I'd be happy if someone explained me why this circuit is the way it is; how does it work ? Also i would like to know what the value for C1 is. Taken from https://www.electroninvest.com/shop/items/...