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 vote
1 answer
514 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....
0 votes
1 answer
43 views

Is this a legitimate RS485 wave shape?

I'm having issues but first of all I need to verify the other end of the communication line… there is a Moxa TCC-100 RS232-RS485 converter attached to the bus and I see this weird signal on the bus ...
0 votes
0 answers
47 views

DC-coupled wide-bandwidth differential to single-ended conversion

I'm designing a circuit that produces differential signal outputs in the frequency range from DC to about 2 GHz. This differential signal will be driven by an FDA (probably LMH6401 or LMH5401). I'd ...
0 votes
2 answers
915 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 ...
0 votes
2 answers
479 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 ...
1 vote
1 answer
2k 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:...
2 votes
2 answers
84 views

Differential capacitive transducer

I would like to design a differential capacitive transducer to measure the capacitance change in an accelerometer. I cant seem to understand, how to demodulate the signal and keep the actual DC value....
1 vote
3 answers
5k views

Internal USB (FFC?) cable with 90 Ohm Differential impedance

I'm trying to run USB D+/D- signals and some unrelated 19V power between two PCBs, on the daughter PCB the USB D+/D- will terminate to a USB-A-F jack. I have no problem maintaining 90 ohm differential ...
0 votes
1 answer
39 views

Length matching/differential pairs and distance to polygon and other layers

If you have length matching on the inner layer of 4 layer board: Do you need any minimum or maximum distance to the adjacent layers above and below? Are there any rules of thumb? Also is there any ...
1 vote
1 answer
164 views

Design of Fully Differential OTA Circuits

This is the equivalent model of an ideal single-ended OTA: Now, this is the equivalent model of an ideal fully differential OTA: Now, is there a rule for getting a certain circuit with a fully ...
0 votes
2 answers
272 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 ...
6 votes
1 answer
3k views

BJT Differential Amplifier-Long Tailed Pair

I am trying to solve this assignment Consider this schematic (the BJT's are in the effective area, with \$\beta=200\$ so as to \$i_e\approx i_c\$). Also \$R_1>>R_E+r_e\$. Define the ...
0 votes
1 answer
35 views

Correct Dielectric Height on Differential Impedance Calculation?

I'm designing a custom PCB around the Raspberry Pi RP2040 MCU. Their hardware design guideline said the traces between the USB and the termination resistors should have a differential impedance of 90 ...
0 votes
1 answer
55 views

What can this CAN bus like protocol be?

I am currently probing what seems to me the CAN bus twisted pair of my car. But the signals are not what I expect. One of the pair is like a typical CAN HI signal, however the idle state is a 0V and a ...
-1 votes
1 answer
57 views

Differential signalling [duplicate]

This is a similar question to one over here. Posting a new question here, assuming that my question was not clear in that. Can we split a differential signal into 2? Assume the below image: I'm using ...
1 vote
2 answers
92 views

RS-485 Network Topology with Backbone and Daisy-Chain Stubs [closed]

I am designing a RS-485 network and would like to know whether the configuration below would work. The transceiver I am using is the Maxim MAX485, with the master ad slaves hardwired to always ...
0 votes
3 answers
98 views

Splitting of a differential signal

Can the Ethernet Tx and Rx signals (Using all 4 pairs; RGMII interface) be split into 2 so as to connect to 2 RJ-45 connectors, but only 1 will be used at a time. In general, can we split any ...
1 vote
1 answer
2k views

How to calculate the transconductance of this circuit?

I have this circuit where the "FES" blocks are simple current mirrors and the block "PD" is a differential pair. All the transistors in those blocks are BJT, NPN or PNP, respectively. I found all ...
1 vote
2 answers
736 views

Operational Transconductance Amplifier Input Configurations

I recently purchased several OTAs (Lm13700) but have had quite a bit of trouble using them. Going through the TI datasheet and a Nuts & Volts tutorial it's occured to me that transconductance amps ...
2 votes
1 answer
53 views

How do I make these MIPI signals better?

I have a system which transmits 1 Gbps single lane MIPI video over several flex circuits. Where each flex circuit connects to its neighbour, I have placed a MIPI repeater chip: SNx5DPHY440SS. At the ...
1 vote
1 answer
51 views

What are the recommended differential trace characteristics for Power over Ethernet input section?

I've been looking through a few application notes for Power over Ethernet front ends such as Microchip AN3468 and Skyworks AN1130. I can't figure out what the characteristic impedance of the ...
0 votes
2 answers
353 views

Finding Vout and Gain of a differential amplifier

I am given this figure below: And I am trying to find Vout and the gain. From looking at this source: https://www.electronics-tutorials.ws/opamp/opamp_5.html I have determined the gain to be 10k/1k ...
1 vote
1 answer
241 views

Passive probe vs diffential probe

In the image: Channel 1: Drain to source voltage Channel 2: gate to source voltage Channel 3: Switch current Channel 4: Load current The image shows Vds of low side MOSFET at turn on measured with a ...
4 votes
1 answer
96 views

Characteristic impedance when routing differential

Can the characteristic impedance value of a single-ended transmissions line be omitted when the two transmissions lines of a differential pair are routed differentially (not two isolated lines)? I ask ...
1 vote
0 answers
24 views

Is it possible to convert LVDS (TI DS90c241/124) differential signals to optical signals?

I have a circuit that uses the TI DS90C241 DS90C124 serdes pair to serialize 24bits of data from one board to the other. Either due to electrical interference or the transmission media's ...
0 votes
0 answers
15 views

Logistic Growth in MATLAB -- Need help with the plot

I'm working on a school project about coding the logistic growth using matlab gui, till now everything is great, the calculation is perfect, but I'm stuck with the graph, it always show only one point ...
0 votes
2 answers
80 views

Multiple conductors used for the same signal

I've inherited a design that has a pair of PCBs mated with two-row mezzanine connectors (0.5mm pitch, 2.5mm mated height) There are two differential pairs that travel through the connectors (RX and TX)...
1 vote
1 answer
317 views

Why do we need differential amplifier after Transimpedance amplifier?

I am implementing the circuit published in AN3025 Transimpedance Amplifier Design as shown below. When I am simulating this circuit, a few questions come to mind: Q1. Why do we need a differential ...
-1 votes
1 answer
51 views

What is the function of a forward inverter and an inverted inverter in parallel in a digital circuit?

When I was simulating a divider using two D-latch as shown below (two D-latches in series,) I found that the circuit in the red rectangular is key to the differential D-latch. In fact, the circuit in ...
1 vote
2 answers
55 views

What happens if you go below the minimum common mode voltage of a current sense amplifier?

This might be a simple one, but I can only seem to find information on going above the common mode voltage (VCM), not below it. Obviously going above the VCM upper limit will damage the device. I'm ...
0 votes
0 answers
66 views

Oscilloscope "isolated" inputs

As I don't want to see my oscilloscope go up in flames when I play with probing circuits, I was wondering the following: First off, my goal is to measure different floating voltages aka the "GND&...
1 vote
1 answer
64 views

Differential voltage to frequency

Edited to clarify some questions I’m working on a design that will take a 0.5V-4V signal from a laser displacement sensor (Keyence Il-1000) and convert it to a frequency signal (0.1-2Mhz) for input to ...
1 vote
1 answer
228 views

Homemade EEG circuit common mode feedback

I am currently building a DIY EEG circuit using this guide. This guide is for when there are two inputs. How can I modify this so that I can also input two EMG signals too? It is common knowledge that ...
0 votes
1 answer
375 views

Using common mode choke in differential configuration for differential mode EMI filtering

Why is it not popular using common mode chokes in differential mode configuration for differential mode noise filtering? Mostly when using fly-wire type chokes with filters, where the chokes are ...
6 votes
2 answers
1k views

Long-tailed pair - gain and bandwidth

I'm trying to understand this schematic of this differential probe: I marked some blocks. I have some questions about the block I marked "Long-tailed pair" (LTP). I have no experience with LTPs so ...
3 votes
3 answers
301 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 ...
2 votes
1 answer
101 views

Battery voltage measurement using ADC problem

I want to measure the open circuit voltage of an electrochemical battery using an ADC and an Arduino. I need to use the ADC in differential reading mode (A0 por positive and A1 for negative). ...
0 votes
2 answers
185 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 ...
0 votes
1 answer
167 views

MIPI DSI/differential pair layout guidance

I have a display sample that I'd like to interface with a Linux SBC, the only issue is that the connector is not compatible. To make it possible to interface the two parts I've designed a PCB, trying ...
1 vote
2 answers
181 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 ...
0 votes
1 answer
846 views

Input filter on differential amplifier input

Hi, I need to determine the transfer function Vout/Vin. A traditional differential amplifier transfer function without the 2.2uF on the input side would be G1 = (Z2/Z1)*Vin, where Z2 = (2.2uF // ...
-1 votes
1 answer
54 views

Micro USB and RS485 Compatibility

I am looking into understanding micro usb better and seem to be missing something apparently obvious different about the difference between micro usb and rs485. From looking online like here, the ...
4 votes
2 answers
303 views

Why don't I get the right values for Vout=Gain(v1-v2) for this differential BJT amplifier?

I am trying to use the formula that they have mentioned Vout=Gain(v1-v2), in my simulator I have placed one signal at 0.001V and the other one at 0V. The gain that they have found is 192, so I expect ...
1 vote
2 answers
44 views

ARINC429 - Help generating differential ouput with SN75172?

I'm trying to make a simple circuit setup to do a single-ended input to differential-balanced output of the ARINC429 spec, which is differential +5/-5v (10v p-p)... ie spec is explained better here: ...
0 votes
1 answer
218 views

Calculating the gain in a differential amplifier

I have a specific question regarding this circuit: I need to calculate the gain of this amplifier. However, when I do this, I get the value two times bigger than the simulation of this circuit, which ...
0 votes
2 answers
47 views

DAC differential output signal problem?

I'm trying to use a MAX5183 DAC to generate an analog voltage from a digital input. I have got it working in as far as the outputs follow the shape of the input digital waveform (just a sawtooth input ...
1 vote
3 answers
436 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(...
1 vote
1 answer
195 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 ...
1 vote
1 answer
392 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 ...
0 votes
0 answers
41 views

Linearity Loss on Single Ended to Differential Circuit

I have a board that converts a single ended output of a DAC to a differential signal with options for the common mode voltage. The output of my 20-bit DAC goes on the VOUT_BUFFERED signal here. At ...

1
2 3 4 5
18