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-

Filter by
Sorted by
Tagged with
-1 votes
1 answer
72 views

Why would a low-pass filter be connected to +5V on an RS422 differential line?

I am interested in a datasheet's schematic for my own PCB design of a similar system. In my system, I am receiving an RS-422 differential line, and would simply be tempted to put a 100 Ohm terminating ...
Tommy95's user avatar
0 votes
0 answers
73 views

How to connect cable shield when receiver side powers signal source?

I have element 'A', the receiver, connected to earth, which powers modules 'B' and 'C', the signal sources, unconnected to earth. 'B' sends a differential line signal, and 'C' sends an analog signal. ...
Tommy95's user avatar
0 votes
1 answer
32 views

Why does the offset voltage have this polarity?

Consider the following from Chapter 3.5.6 of Analysis and Design of Analog Integrated Circuits by Gray, Hurst, Meyer, and Lewis: As I ask about in a separate question, the authors claim that for some ...
EE18's user avatar
  • 319
0 votes
1 answer
26 views

Why is an offset voltage and an offset current sufficient to represent mismatches in a differential amplifier?

Chapter 3.5.6 of Analysis and Design of Analog Integrated Circuits by Gray, Hurst, Meyer, and Lewis discusses the effect of device mismatches on the behavior of emitter- or source-coupled differential ...
EE18's user avatar
  • 319
-1 votes
1 answer
100 views

Low-Voltage Differential Signalling (LVDS) not working

I have updated the schematic and hopefully included all the suggestions. The problem of the LED strip flickering is still there, however, I have noticed a slight improvement after altering the circuit ...
Nugget's user avatar
  • 1
1 vote
0 answers
20 views

How can I get a differential output as an input for another circuit on ADS?

I'm currently making a project on ADS for a differential pair oscilator: The desired output for this circuit is Vout2-Vout1.Now, I want to plug a buffer on this circuit, but I don't know how to ...
Gevezo's user avatar
  • 113
5 votes
5 answers
776 views

Is the voltage on the negative of a differential pair actually below the ground voltage used to generate the signals?

Apologies if it’s obvious but I always hear that differential pairs have a negative and positive waveform (one on each line) that’s opposite. Now I get that you could choose whatever value or point “...
George kirby's user avatar
0 votes
0 answers
39 views

Low Side Bus One Shot

I'm confused on what exactly a one shot is and how to identify it on prints. For this example I know there is supposed to be a one shot on the low side of a 69 kV / 12 kV bus, but I'm not sure how ...
Redwood's user avatar
2 votes
0 answers
52 views

Transmitting differential video signal to the ADC input

I'm designing a circuit that converts a single-ended analog video signal (f = 10 MHz) to a differential pair and then is processing the data to a digital form. The signal is transmitted through a ...
drydre's user avatar
  • 75
5 votes
2 answers
816 views

What is the difference between PN- and PM- Differential pairs?

I am looking in the past recent weeks in a lot of datasheets and I see PM labels for LVDS (Low voltage differential signals) or generally Differential pairs on the Block Diagram. Altium would ask me ...
johnny_1010's user avatar
2 votes
2 answers
47 views

Differential DAC filter capacitor options

The standard output filter for a DAC with a differential voltage output looks this way: simulate this circuit – Schematic created using CircuitLab However, some DACs have this filter ...
bkxp's user avatar
  • 181
2 votes
1 answer
69 views

Designing a single-ended to differential driver to DC2588A-A evaluation board

I'd like to test the DC2588A-A, and I noticed that the user guide mentions it's driven by a pair of ADA4899-1 DRIVER amplifiers. However, the user guide doesn't provide clear information about the ...
Abdel Djaferbey's user avatar
0 votes
0 answers
31 views

Understanding the purpose of REFT and REFB on a differential ADC

I am using the Analog Devices AD9238 ADC for a project and I am confused about the purpose of the differential voltage references (REFT and REFB). I am powering the AD9238 from a +3.0V supply and I ...
Bertus's user avatar
  • 1
1 vote
0 answers
79 views

Ethernet MLT-3 signall probing

I am getting radiated emission failure in my system, where the emissions were out of limit (~5 dB) for frequencies 125 MHz, 175 MHz, 225 MHz, 275 MHz, 775 MHz, 825 MHz. This sounds like the odd ...
NICEGUY NICEGUY's user avatar
2 votes
0 answers
52 views

USB to FTDI connection

I try to connect USB 2.0 to a FTDI FT2232HL. This is my first high speed layout. I am planning to use 2-layer board 1.6 mm. I know that I have to keep 50 Ω Z0 and 90 Ω Zdiff. However with the 2-layer ...
Pavs's user avatar
  • 21
0 votes
0 answers
35 views

Difference between current and voltage expressions in fully differential circuits

In the fully differential circuit below, the common-mode (CM) and differential-mode (DM) voltages are defined as $$V_{DM} = V_1 - V_2$$ $$V_{CM} = \frac{V_1 + V_2}{2}.$$ Considering the CM and DM ...
DavidG25's user avatar
  • 1,234
0 votes
0 answers
70 views

Differential Amplifier with unbalanced differential signal

The circuit topology of figure 1a corresponds to a differential amplifier with resistor load. Since the signal generator available in lab does not have a differential output, a balanced differential ...
Aleat's user avatar
  • 167
2 votes
0 answers
50 views

TRS differential input and output connector wiring for balanced audio CODEC I/O connections

I've been studying the ADAU1361 evaluation board and noticed an odd thing how the differential input and output connectors are connected in their schematic on its user guide, page 7, focus on the left ...
Giedrius's user avatar
0 votes
1 answer
56 views

How to calculate the via fence spacing between two differential CPWG?

I designed a very compact 4 layer PCB that has many PCIe 2.0 differential pairs spaced in close proximity. In addition to the internal ground planes, I want to fill the signal layers with copper, and ...
AnB's user avatar
  • 27
0 votes
3 answers
119 views

What are the most effective techniques for reducing the negative effects on differential pairs routed on top of two different ground planes?

I have an FMC Card with analog circuitry containing channels. I've separated the ground for these analog channels into two distinct planes: AGND and PGND. PGND serves as the ground for the power ...
kakeh's user avatar
  • 592
6 votes
2 answers
1k views

USB (low speed) on stripboard: can it work?

I recently designed a PCB, with a connector for an extension module for "future uses" (with various signals: GPIOs, I2C, SPI, USB2.0, USB3.1, PCIe Gen4). The connectors are fine pitched (and ...
Sandro's user avatar
  • 6,250
0 votes
2 answers
110 views

How do you wire up the PCA9600 I2C bus extender to use differential signalling at 12V?

I would like to use a 12V differential signal between two NXP PCA9600 I2C buffers to extend I2C at 100kHz to about 15m over 100-ohm twisted pair (CAT6). My original understanding from a brief look at ...
KJ7LNW's user avatar
  • 1,786
4 votes
1 answer
174 views

Is the output of this DC-DC converter considered a differential pair?

Very new to electronics. I am using this DC-DC converter in one of my designs. It is a dual output (+/- 15V) DC-DC converter. I have read a few articles about how important it is to keep differential ...
UnstableDynamics's user avatar
0 votes
0 answers
43 views

Connecting LVDS to oscilloscope using ferrite bead to isolate GND/SHIELD

I want to measure LVDS signals with a scope. Will my solution work? (Shown at bottom.) I know of other ways of doing this, but I am hoping this way is cleaner and easier. Specs: Frequency:~100MHz ...
Tony's user avatar
  • 683
1 vote
0 answers
44 views

Mitigating 2.4GHz interference from 0-5V analog signaling line

I am chasing my tail on a project and cannot seem to find a way out of the hole. I have a small 18mm 40kHz piezo transducer running through a powered precision rectifier+preamp circuit. This tiny ...
Matt001's user avatar
  • 17
0 votes
1 answer
29 views

MUX for different voltage levels

I have a project which has two inputs. Based on what signal the user inputs, a MUX (or something else (not relay - it needs to me ultra small and very low power)) directs it to the appropriate pins of ...
okwestern's user avatar
3 votes
1 answer
146 views

Time-Varying Inductance in Electrical Systems

How to derive and solve equations for electrical systems when the inductance of an inductor is not constant and changes over time? I'm familiar with the standard equations like E = 1/2Li^2 or V = Ldi/...
MohammadAli Zeraatkar's user avatar
0 votes
0 answers
64 views

Over voltage protection for 5v differential line

I am working on a stepper motor driver that will use 48V as a power source, this driver will have encoder interface. The encoder has 3 differential lines which will only tolerate 5V. I want to protect ...
Muhammad Nour's user avatar
0 votes
1 answer
57 views

CSI differential pairs differential impedance : follow Jetson design guide or standard 100R value?

I'm designing a PCB based on the Jetson Orin NX system on module, using a camera (MIPI CSI PHY-D). The problem is that the design guide of the Jetson is giving me a differential impedance of 90-...
Sandro's user avatar
  • 6,250
0 votes
2 answers
65 views

How to plug phase and neutral on this differential? [closed]

I have replaced an old differential with this one: Since there's no indication how/where to plug in line and neutral, can you please help?
zfou's user avatar
  • 109
1 vote
1 answer
48 views

Finding transfer function in a balance state

I have an ODE that looks like this: $$ \dfrac{d^2y(t)}{dt^2} + 2\sin{y(t)} = u(t) $$ Taking u as input and y as output, considering the balance state with $$ u(t) = \bar{u}, y(t) = \bar{y} $$ ...
Sonamu's user avatar
  • 203
1 vote
1 answer
77 views

Highlighting Differential Pairs in Altium

The PCB was designed, the gerbers were extracted in rs274x format. But it doesn't include the rs274-x2 version (so doesn't include differential pair impedance information). What can I do to highlight ...
Electronx's user avatar
  • 543
2 votes
1 answer
49 views

Are the supply voltage and differential signals put on the same connector?

I have a circular connector. Assembly card size coming from the mechanical department limits me so I must use the pins of the same circular connector for 28V DC power supply and some differential ...
bcdyzi's user avatar
  • 89
2 votes
1 answer
131 views

HCSL source vs. end termination

Regarding HCSL I wonder why there is source termination at all? If in case of source termination, at receiver side there is no termination or a high impedance input, then the input reflects nearly all ...
stowoda's user avatar
  • 530
1 vote
3 answers
92 views

'Best' topology to measure this weird sensor standard

I am developing an embedded solution to measure and record the analog signal from a PCB Piezotronics pressure sensor. Specifically the Model 124A21. The sensor has some integrated circuitry to boost ...
Nathaniel's user avatar
0 votes
1 answer
84 views

Weird pinout of USB ESD protection

The USB ESD protection component USBLC6-2SC6 seems to be very popular (?). However, its pinout seems not ideal: The USB differential pair should be routed close to each other, but the pinout of ...
root's user avatar
  • 149
2 votes
1 answer
560 views

PCIe Gen4: inter-pair skew: any limits?

For PCIe (and more particularly PCIe Gen 4), is there any recommendation on the maximum inter-pair skew, i.e. the maximum time/length difference between either: 2 TX differential pairs (of different ...
Sandro's user avatar
  • 6,250
0 votes
1 answer
69 views

What is a voltage-controlled differential current source & how do you simulate it in simulink?

I am trying to achieve the same circuits designed in this paper: https://arxiv.org/abs/1512.05064 by simulating it in simulink, yet I can't seem to understand what it is referring to by saying voltage-...
Salah Elabyad's user avatar
2 votes
2 answers
860 views

Differential pairs without ground plane

I need to make a small PCB, this PCB is just for switching from one connector to another, it's just an adapter to change the pinout of the connector. So, there are no components, but only traces. The ...
Federico Massimi's user avatar
0 votes
0 answers
73 views

SX1261/2 transceiver design: Antenna pins and balun

I am designing my first transceiver (first PCB/IC that uses an antenna). I chose SX1261/2 because it is cheap and supports LoRa protocol. While designing the PCB and reading the datasheet of the IC I ...
Christianidis Vasilis's user avatar
3 votes
2 answers
406 views

The MIL-STD1553 transceiver IC has differential pairs with the same pin names. Should I connect them?

The MIL-STD1553 transceiver IC has differential pairs with the same pins . Should I connect them?The IC that i use holtic hi 2130 and I couldn't see any warning in datasheet about it. In the ...
Electronx's user avatar
  • 543
0 votes
0 answers
55 views

Interface Ethernet voltage

I just want to know what are the voltage levels on the Ethernet differential lines (both single ended voltage level wrto ground & different voltage between the pairs). I haven't measured the ...
Freshman's user avatar
2 votes
1 answer
385 views

Path of common mode noise in a DC-DC converter

I have a doubt about the common mode noise propagation in DC-DC converters. Consider a simple Buck converter, the switching nose is where the potential difference between the varying voltage occurs ...
ORion's user avatar
  • 57
0 votes
3 answers
191 views

Differential op amp feedback resistors

I understand if you do not have negative feedback in any op amp configuration then the output will be unstable (will oscillate for example) and the feedback resistor and input resistor on the negative ...
MRB's user avatar
  • 402
2 votes
1 answer
109 views

Zigzag pattern on differential traces

Does anyone know what this pattern means in Altium Designer? If it is related to a warning, how do I get rid of it?
MoCuishle's user avatar
3 votes
2 answers
120 views

Benefits of a differential PA in an RF power combiner design

Looking at the schematic for the Shure PA770 Antenna Combiner (found in their FCC listing) we can see the design is fairly straightforward, some amplification before combining via a typical Wilkinson ...
jduncanator's user avatar
4 votes
1 answer
384 views

10/100 Ethernet Routing Review

I know it is a big favor to ask, but this is my first ethernet design, so could you provide input on the routing from connector to mag and from mag to PHY? Is it fine or how can I improve it? Really ...
HV16's user avatar
  • 185
0 votes
1 answer
198 views

Using a differential op amp to convert a differential pair into a single ended signal

I need to convert a differential pair into a single ended signal and would like to use a differential amplifier to do this. Using the above circuit and the ADA4850 I was hoping to achieve this but of ...
MRB's user avatar
  • 402
0 votes
0 answers
52 views

AC Source RC Circuit Differential Equation

I have to find the differential equation to this circuit and I have been stuck for two days. I have tried: KCL in loop 1 and loop 2 but I don't know how to do the current through the inductor as Vi(t) ...
spyingU2's user avatar
0 votes
2 answers
95 views

Questions regarding ESD protection

I have a couple of questions regarding the Basics of ESD. Usually, when we employ ESD protection, say placing a TVS diode on the signal line, the other end of the ESD diode terminal: a) Will be ...
user avatar

1
2 3 4 5
19