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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47 views

I2C over long distance with RJ11 CAT3 cable: how EMI noise will effect differential (but not twisted) pair wires

I have several nodes with Cat3 RJ11 cable in my office. I need to do an I2C communication between several nodes over + 20m and read about the PCA9615 driver. Unfortunately, the Cat3 RJ11 cable has ...
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1answer
72 views

ICs on opposite sides of a PCB

I am relatively new to PCB design and circuits in general. I am routing my first 4 layer board now and I am wondering about placing ICs on top of each other on opposite sides of the PCB. The ICs in ...
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43 views

Driving optocoupler by a line receiver

I wanna drive TLP350 by a line receiver AM26LS32. I employed scheme 1, however, there was no signal on output. I found in line receiver datasheet that the current sign is negative so it is likely to ...
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58 views

What is Ethernet diff. pair referenced to between connector and magnetics

This is a little bit confusing part. I clearly understand that in ethernet cable fields are coupled between wires of differential pair. On PCB on IC/PHY side it is also known that differential pair ...
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37 views

Differential Pair active load contradiction

I'm confused about one current-based explanation for why the active current mirror restores a differential pair's gain by letting each differential input reinforce the other. The explanation (from ...
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1answer
27 views

Differential transceiver SN65C1167

I have a question about a differential transceiver. In my application I am using a MCU to generate PWM signals for a gate driver board (CGD1200HB2P-BM2). This board, however, needs a diffierential PWM ...
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3answers
81 views

Differential (RS-422) vs current mode signaling in noisy environments

I’m building some automation equipment for my shop that will be used in extreme noise environments (plasma cutting and TIG welding nearby, for example) and I’m trying to come up with the best ...
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37 views

Differential integrator vs standard

I want to integrate/amplify a very small signal (relatively short pulses of 100ns to 4ms, necessitate high-bandwidth components minimum 40MHz+). The capacitors will be switched (shorted) when not in ...
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23 views

Finite CMRR even with ideal tail current source (body effect)

In Razavi's Design of Analog CMOS Integrated Circuits 2nd edition page 123, the diff-pair below is included with a comment about how even if the tail current source is infinite, if the transistor pair ...
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1answer
28 views

Referencing multiple differential pairs to ground before analog multiplexer

Yesterday I asked how to properly reference a differential signal (in my case from a current transformer) to ground, and got told that the impedance to ground should be matched at the location where ...
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53 views

Create differential signal from single ended encoder

I have a problem with the output of an DC motor encoder feedback. I have an 5v single ended encoder (AB signal), but my control needs an differential signal. I am not sure how to do this as I have no ...
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31 views

Differential pair linear range

If I increase the tail current, will the linear range of differential pair (range of Vid when both transistors are on) become larger or smaller? According to this formula, linear range will increase ...
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1answer
42 views

Best way to combine different frequency sinusoids to simulate noise?

I'm designing a differential amplifier to remove noise from a signal, and I'm trying to verify my design by simulating a noisy input, but I'm not sure how to do this. The diagram below is roughly what ...
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49 views

How can I do a buffer to those circuit?

I need to project a amplifier with 3 stages. First, a differencial pair with active load and current mirror. Second, a cascode and third, a buffer. I'm using BC547(npn) for differencial pair and ...
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19 views

Level Translation Clarification (LVPECL and LVDS)

I am trying to understand something about level translation. I am sure I am probably misunderstanding something basic, so I'm hoping you can help me understand. I am trying to convert a LVPECL signal ...
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37 views

Differential to Single-Ended Converter + Common-mode Shift + Sallen-Key Filter (Is one Stage Possible?)

I have a differential signal that needs to be conditioned as follows: Convert from differential to single-ended. Filter with a 3rd order Sallen-Key filter Common-mode shift into an single-ended, ...
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1answer
69 views

differential ADC full scale signal

I have the ADS4249 differential ADC from Texas Instruments here is the datasheet. On page 55 it says: For a full-scale differential input, each input pin (INP and INM) must swing symmetrically ...
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17 views

How to calculate a differential ADCs resolution

I have a differential ADC with two internal reference voltages. The bottom voltage is 1V the top voltage is 3V with a 14bit resolution. I want to calculate the resolution in V. For a single ended ADC ...
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1answer
55 views

Top layer vs mid layer for high speed ADC signal routing

Assuming we have an analog differential signal trace that we must route from the connector to,say, an ADC (24 bit or 32 bit kind as I don't think lower resolution ones are affected by this.) What we ...
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1answer
30 views

Common mode filtering a shunt: “active” vs. “passive” strategies (diff. amp vs. common mode choke)

If you are trying to observe a relative small voltage across a shunt resistor and you are finding common mode noise interference induced in the signal, in what cases would you choose to use something ...
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1answer
26 views

Differential amplifier with a notch on output

This circuit is used to: Read an encoder output and level shift it to 3V3 from 24V; Convert a 0-10V input signal to 0-3V3; Both points 1 and 2 should be usable at the same time. Point 2 works ...
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2answers
73 views

Op-amp comparator and differential signals

On a board I'm working with, there's a 120 ohm termination resistor. I need to measure the voltage across it and compare it against a reference voltage. I'm wondering how to make the connections. The ...
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5answers
314 views

Common ground in low side current sensing

I've asked this question a while back and user/Transistor told me that the circuit will be floating and drift without a common ground, he suggested a virtual ground. but in this case we already have a ...
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2answers
66 views

What is the role of the differential amplifier in a delta sigma converter?

A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme the differential amplifier is substracting ...
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65 views

What is Input Impedance Mismatching of differential Operational Amplifier?

I am new to design differential op-amp. I am not sure if my circuit will experience input impedance mismatching. Can anyone explain how input impedance mismatching will happen in differential op-amp? ...
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1answer
44 views

Measuring a divided differential voltage into a single ended DAQ

I am looking to log a high sped voltage (20 kHz) +-60 V, into a single ended DAQ at +- 5V. Is the following circuit a good example of accurately measuring a differential voltage or is it overly ...
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2answers
82 views

Difference amplifier using Op-amp in LT-SPICE

I am simulating differnce amplifier in LTSPICE as shown below, i have used 400V DC source with 10V sin wave and then i am dividing it by factor of 80 and them taking differece with 5V source. Below ...
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75 views

Which differential protocol to use when redriving Ethernet?

I want to redrive a 100-BaseTX signal on a board. The signal is to be redriven 3 times (by the same setup). On one end is a STM32 NUCLEO-F767ZI board, and on the other end is a GbE switch including ...
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2answers
39 views

Input common mode voltage of AC coupled differential pair

I was reading OnSemi's AN8173 app note and couldn't understand why input common mode voltage of AC coupled line is equal to VTERM. My thought was each input of the receiver, D and \D, will swing ...
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1answer
39 views

Differential equation of the NPN transistor configured as a voltage divider

The mathematical model in AC of the NPN transistor is represented by the pi model which is only one resistance in parallel to the resistors of the divider and the DC source in parallel to the ...
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45 views

Current transformers, voltage output vs current output

I'm designing a energy monitoring system that is using split-core clamp current sensors to measure multiple high power lines(40+ lines at 300A each) in a MCB room of a building. I'm currently sourcing ...
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39 views

How can FPGA differential signal use lower power when it has two lines instead of one?

I am a bit confused about differential signaling on FPGAs. I am trying to figure out how does power dissipation in FPGA differential signaling compare with power dissipation in FPGA single ended ...
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1answer
87 views

What “mode” is static electricity (lightning?) Is it common-mode, differential-mode? It seems half-way, or “mono”

The common-mode or differential-mode designations assume two conductors, one in-phase, the other anti-phase, but a static circuit is different because the "conductor" is concentrated in thin ...
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27 views

How do you find rO when solving this differential amplifier?

gm could be determined using Jacoletto (40*Ic, where Ic was found while solving the bias point)? Some of my attempts at solving the circuit
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32 views

FT232RQ USB pins order confusion [duplicate]

I am implementing a USB to UART conversion board with a FT232RQ. What confuses me is the fact that the USB_D+ and USB_D- pins of the package are sequenced in precisely the opposite order as they are ...
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127 views

Upper 3-dB frequency of differential amplifier with current mirror load vs with resistive load

In the BJT case, why is it that the upper 3-dB frequency of a differential amplifier with a current-mirror load (1st picture) is lower than that of a differential amplifier with a purely resistive ...
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40 views

Measure Battery voltage with ADC in noisy environment and supply circuit from that same battery. single ended/differential mode?

need your opinion: Want to build a device that is able to measure a battery voltage and send results wirelessly every x minutes. The Battery has nominal 24 volts. Batteries are in a yacht (e.g. engine ...
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2answers
58 views

differential instrumentation amplifier in LTspice not working

I was trying to simulate an instrumentaion amplifier in ltspice. the problem i am having is the output when measured across C1 is wrong. since i have an amplification factor of 11, i was expecting to ...
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1answer
53 views

No gain in CMOS differential amplifier

Currently I'm working on the design of 1st stage of CMOS differential amp (pic. 1). I'm using classical design to achieve at least some gain. I'm using CMOS 90nm process and SPECTRE simulator. So far ...
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1answer
55 views

Simulating PMOS differential amplifier in Cadence

I am studying about rail-to-rail opamp design and I am trying to recreate the Itail vs Vgs (in this case input common voltage) curve from the link bellow (pages 5 and 6): https://mixsignal.files....
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29 views

Improve range on a differential ADC

I'm using an MCP3425 ADC, it has differential inputs but I'm using it as single ended mode. The signal that I want to digitize comes from an integrator circuit (an op amp with a capacitor in its ...
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1answer
30 views

Attenuation in the circuitry of differential vs isolated probes

Using this website as a reference for differential probes: https://circuitcellar.com/research-design-hub/high-voltage-differential-probe/ By Andrew Levido, Circuit Cellar The differential probe is ...
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39 views

Differential communication, VCC and GND recovery

modern MCUs are consuming so little power that I started thinking about using only two differential data transmission lines for sending not only data but power also. I made a simple schematic below of ...
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1answer
39 views

What could be causing differential signal drift?

I looking at a differential signal on a scope, and I see that while the signal should be exactly equal and opposite the values are slowly drifting slightly. The quantity I'm looking at is the areas of ...
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1answer
68 views

I2C differential network architecture using PCA9615

I'm building an architecture for a large scale robot (3x3meters) and I would like to build a specific architecture around I2C differential to control motors drivers (this should be noisy). My problem ...
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1answer
66 views

Measuring voltage without a common ground

When measuring a power source voltage using a differential amplifier, without a common ground with amplifier supply, to which ground should we connect the differential amplifier resistor ground? V1 ...
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1answer
34 views

Maximising sensitivity of AC voltage measurement on top of DC voltage with Arduino ADC

I have: Single supply rail voltage (3.3) current sensing transformer that outputs an 1v pk-pk value at is max rated sensing current (10A). The Transformer biased at 1v DC in order to ensure that the ...
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2answers
79 views

Read USB data to arduino [closed]

If I take a USB cable connect it with my cellphone from 1 half and in the other end I connect VCC and GND to VCC and GND pins of the arduino and the D+ and D- pins to digital pins and use a ...
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1answer
35 views

Differential signalling with negative feedback

Does differential signalling always comes hand to hand with a negative feedback circuit?Else the 1s and 0s would be the same!because if we have ground in the inverting pin then the output voltage will ...
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2answers
84 views

Is a fully differential opamp subtractor possible?

I know how to subtract two single-ended voltages with an opamp configured as a subtractor. I'm learning about fully differential signal processing and I'm wondering if it is possible to subtract two ...

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