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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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1answer
32 views

How to obtain a high precision mV signal within a specific interval using a variable resistor?

I want to design a circuit which outputs a signal ranging from 0-70 mV using a variable resistor ranging from 80.51 Ohm - 183.05 Ohm and a supply voltage of 12 V. My idea so far has been to make a ...
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33 views

Differential to single ended digital signal

i have a 8GHz differential clock to convert to single ended. Is taking one end of the clock enough? what are the risks of doing so?
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Differential low pass filter to single ended -> Differential low pass filter

I'm designing an audio DAC based on the PCM1690 from TI. Datasheet One requirement of the DAC is differential outputs. Since the PCM1690 has differential outputs, this is not a problem. However, the ...
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2k views

Differential to Single-ended conversion clipping issue

I am attempting to convert the differential output of a DAC to a single-ended signal using the following circuit from a TI datasheet: The signals going into this amplifier look like this: And the ...
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1answer
74 views

Special requirements 100Mbps (Ethernet) connection to PCB

Is there any special requirements/limitations to how 100Mbps Ethernet conductors can be connected to the PCB? For instance in the design prompting the question I have a Ethernet connection entering ...
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49 views

Single-ended analog signal to differential

I need to transmit 2 analog signals over a cable in a noisy environment. How to transmit them as differential ? Given that : Each signal can be used to inject and receive current (< 130 kHz, &...
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1answer
106 views

How to transmit analog signals over cable?

In my current project, I need to transmit 4 analog signals (A1, A2, A3 and A4) on a cable from one PCB to another. I am working at 3 VDC and the distance between them is relatively short (< 30 cm). ...
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19 views

EAGLE. Differential pair routing. Width of the track changes after first change of direction

I try to route differential pair of tracks. When I click the mouse to change the direction it also changes the width
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1answer
173 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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519 views

SPI with differential signaling

Standard SPI uses single-ended signals. Is it possible that a communication uses SPI protocol but the signals are physically LVDS?
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1answer
428 views

Is the ground necessary with an opto-isolated RS422 signal

I have 8 opto-isolated RS422 ports to install. All of them are coming from a single PC card. It provides the opto-isolation for every RS422 port. Every signal is opto-isolated from the PC ground and ...
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1answer
115 views

RS485 Eye diagram - does it look good?

I got a new diff probe, I am trying it out on RS485. I'm triggering on the rising edge. The RS485 is running at 25Mhz. Does the eye diagram look good? Could I double the speed (50MHz) and be ok? (...
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204 views

Differential Opamp Strange Behavior

I have no answer for this strange opamp behavior. The circuit shown is from a typical nonisolated ,Non grid-tie inverter product (imagine H bridge Inverter). which has a common -ve high power circuit ...
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39 views

Quadrax routing on a PCB

When connecting twisted pair wires to a printed circuit board, I hope I am right in thinking that differential pair routing is used on the board in either a stripline or a microstrip configuration to ...
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14 views

Capacitor across Vlo and Vhi on DAQ, switching power supply

I have a switching power supply (RC Esc). I am measuring the input voltage from battery using a voltage divider. The Divider is attached to a differential DAQ. I have very large transient spikes ...
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3answers
214 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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51 views

Why does Altium say this net is uncoupled?

I have some differential pairs in Alitum. They require impedance matching to 100R, which is easy enough. Putting the numbers into Saturn PCB Toolkit V7.08, it works out that I want a conductor width ...
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66 views

PCB Routing of CANH and CANL

Continuation from an earlier question: Current Consumption of CANbus (CANH and CANL) I understand how to specify my power supply for multiple CAN transceivers but I am now wondering about the details ...
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1answer
114 views

Some issues modeling a “two terminal source” coupled to a differential amplifier in LTspice

Below is a circuit where on the left there is a floating single-ended source which directly couples as an input to a DC differential amplifier: So the idea is to be able to simulate a real scenario ...
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2answers
174 views

Is there a need for reference plane for differential traces

Is there a need for a reference plane for differential traces. I have seen cases wherein people use unshielded FFC cable like ones from Wurth Electronik for a board to board connection of differential ...
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1answer
55 views

Current Consumption of CANbus (CANH and CANL)

I'm looking to use the SN65HVD230 CAN transceiver but had a question about the current consumption. Datasheet: http://www.ti.com/lit/ds/symlink/sn65hvd230.pdf In table 8.3 Recommended Operating ...
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58 views

Questions about CAN

I'm trying to build a network of interactive LED matrices which will communicate to each other. Each node will be a circular PCB containing an 8x8 RGB LED matrix that is connected through a vertical ...
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1answer
47 views

Does input impedance of an isolation amplifier or a transformer have impact on common mode to differential mode conversion?

I have a question where I can only explain it clearly by an example. It is about conversion of common-mode interference to differential mode due to overall system imbalance. I will use below two ...
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23 views

Question about a common mode feedback circuit

I'm studying fully differential op-amps. I know from the theory that with fully differential op-amps, unlike the single-ended op-amp, the output common mode is not stable because of unavoidable ...
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2answers
56 views

differential opamp reference

simple model of a diff opamp with an independent differential signal source figure 1 how does current flow through the transistors since V1 and V2 and referenced to each other and not to vee? i ...
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1answer
37 views

Requirements for measuring PCIe 2.5GT eye diagram

What is suitable equipment for measuring an eye diagram of PCIe differential pairs. I would like to evaluate the signal integrity of a PCI lane RX/TX/CLK 2.5GT. What is the recommended minimum ...
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436 views

Transient analysis with differential equation

Anyone may help with the differential equation for vC? I write the Nodal analysis equations and find equation for vC but roots of characteristic equation is incorrect! v1 – the node where current ...
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146 views

LIN to RS485 and back to LIN

I am currently communicating between two microcontrollers using a single pin and the LIN protocol over a short distance of 0.2m. Now I would like to extend the distance up to 5m by differentially ...
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2answers
48 views

Measuring voltages from different sources sharing Common ground that might differ slightly

I have a design with resistor dividers and low pass RC filters dropping down 0-32V to ADC range of 0-1.8V. With multiple channels, I attempt to measure voltages from different voltage sources on a ...
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2answers
49 views

Consequences of leaving unused inputs of clock buffer floating. Alternative: best practice

I'm using a Si53342-B-GM Original datasheet download at silabs for the si5334x-series as a clock buffer. In some cases I only need to distribute a single clock signal and in some of my cases I ...
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1answer
42 views

Differential equation for a notch filter RLC circuit

I'm trying to write and solve a differential equation for this simple RLC notch filter and I'm not sure what I'm doing wrong. simulate this circuit – Schematic created using CircuitLab So ...
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2answers
181 views

Using a fully differential amplifier as a differential ADC driver

Regarding my previous question, I decided to use a “fully differential amplifier” to obtain a voltage gain of 10. The source and ADC are also differential. The source is unipolar and its output ...
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2answers
597 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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3answers
1k views

How are differential inputs setup in a differential amplifier?

I was struggling to understand what common mode voltage and CMRR is. I think eventually I understand what it is about. Before posing my new question I will briefly write about my drawing. On the left ...
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4answers
3k views

conversion of single ended audio input to differential

I am working on a bluetooth module for streaming audio signals. Audio signals coming from audio jacks are single ended,but datasheet of module has mentioned that differential audio signals are ...
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2answers
114 views

How to connect/terminate differential CML logic outputs to single ended ECL logic input?

If I want to use a CML differential gate's (Ex: SY58051AU) output as the enable ECL input for an ECL counter(EX: MC100EP016A), whats the best way to connect the output to input? I think I need to use ...
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1answer
43 views

Multi-stage fully differential bandpass filters

I've recently been doing a bunch of research on analog filtering in preparation for a data acquisition system I'm building. For context, while I'm fairly comfortable with FPGAs and digital/computer ...
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5answers
5k views

Generating a differential signal

I was given a small task (actually it's part of a much larger task) where the requirement is to generate a signal which looks like it came from a microphone. The following requirements needs to be ...
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3answers
3k views

Can anyone explain this balanced driver circuit to me?

I'm looking to generate a differential signal to control a laser projector's galvos, and as I understand it needs to be +5V/-5V (10Vpp). I've found this circuit for a laser harp, but I'm confused ...
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1answer
415 views

How does the CMRR of a fully differential amplifier change with input impedance imbalance?

Most pro-audio microphones provide a balanced output -- this is intended to provide improved noise rejection, and provided the output and line impedances are appropriately balanced, it does. However, ...
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98 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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1answer
687 views

Balun single-ended 50 Ohm to LVDS 100 ohm conversion

I have an LVDS differential 100OHM signal which I want to convert to a single-ended 50 OHM signal. I want to use a BALUN for this conversion. What kind of BALUN should I use here? Some BALUNs have 1:...
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60 views

MAX999 draws current through negative input

I have two versions of the input signal: 5V inactive level, 3.2V active; 5V inactive level, 0V active level. Thinking on making universal circuit to support both signals, I decided to use comparator,...
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95 views

10/100Base-TX Ethernet differential pair routing on a 2 layer PCB

My project involves the ESP32 and Ethernet. To get basic functinallity I intend to use the LAN8720 PHY because it is supported by ESP-IDF out of the box. But I also want to try out the KSZ8863RLL 3-...
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3answers
322 views

Efficiency of obtaining differential signalling from a single-ended manufactured transducers

This will be a conceptual question. I'm sometimes dealing with data-acquisition of transducers, like strain gauges, accelerometers ect. sort of sensors. Most of these sensors have their own precision ...
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1answer
99 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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1answer
56 views

USB bus Differential signals and Pin swapping

USB 1.0 and 2.0 has D+ and D- two differential pins. My understanding is that differential signals are symmetrical so any of the two lines carries an inverted signal of the other line. But in the ...
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1answer
101 views

Amplifier output goes haywire with load attached

I'm trying to create an op amp using FETs and BJTs. I need the gain to be over 500, currently without a load attached I have the gain about 1000. The input is a 0.05V sine wave, the output is ...
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124 views

Differential pairs; length matching between pairs

I'm currently busy routing a high speed design containing MIPI signals @ 2,5Gbit / lane to a connector on an 8 layer board. As MIPI also contains a clock pair, it is advisable to match the length ...
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46 views

About the differential gain [duplicate]

Let's consider any circuit which contains a differential pair, for example a telescopic cascode single stage OTA: In every circuit like this one, my professor and every book compute the small signal ...