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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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486 views

Charge mode piezoelectric signal conditioning

I have a charge-mode piezoelectric dynamic pressure sensor (datasheet link) that I want to read a signal from. If you look at the datasheet it says the sensor outputs are in a balanced and floating ...
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1answer
33 views

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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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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0answers
62 views

Differentiator circuit sees noise on PCB after 2 min

I'm new to PCB design, and looking for some advice. I designed a PCB shield and I'm seeing a lot of noise in my differentiator circuit. The circuit will run perfectly for about 2 min and then all of ...
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1answer
430 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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0answers
90 views

How to connect a MEMS Microphone Breakout - INMP401 to a RN-52 bluetooth module?

I intended to use a INMP401 (MEMS MIC) to capture audio and stream it via bluetooth using an RN-52 bluetooth module (RN-52). The RN-52 has inputs for differential +- signals. The INMP outputs ...
2
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1answer
688 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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1answer
139 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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0answers
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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0answers
49 views

How to do Transient analysis?

Consider the above example earlier I used to form a differential equation and then do its solution using Laplace,but for this example the differential equation comes out to be non-ordinary. Please ...
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0answers
56 views

Designing a two stage differential amplifier with MOSFETS

As a part of a "Test you understanding quiz" i had yesterday at school were we tested our understanding of differential amplifiers and mosfets i came across a question that asked us to design a ...
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0answers
31 views

Current source for discrete differential amplifier

I hope someone can point me to the right direction. Basically I face the same problem like the author of the following question. How do I choose the correct current for my differential amplifier? I ...
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1answer
51 views

Common Mode Noise on Differential Lines Driven Against Chassis GND

How is common mode noise filtered on differential lines that have a noise source that is driving them relative to chassis GND? I drew a picture of what I am imagining below. Imagine a PCB with ...
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1answer
72 views

Differential (Subtractor) op amp with low pass filter

is it possible to have a subtractor circuit with a low pass filter in it? My thought is that I would have the possibility of doing that if I add a capacitor in parallel with R3. Is it actually ...
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0answers
120 views

Differential Amplifier with TLC272 vs TL082

I have an LM2576-adj configured to step down 12V regulated output from a wall wart to around 5V-ish (see schematic). On the 5V output I have a 0.1 ohm sensing resistor (Rsc) to measure the output ...
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2answers
182 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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0answers
92 views

Differential bandpass filter Audio application

I am developing an Audio project which is required to output a signal between 10kHz - 40kHz at ±1V. The sound is produced from an AD9106 chip which is interfaced to the following circuit: When ...
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0answers
59 views

Trying to view CM and DM components of a signal on a two channel digital scope screen

I want learn how to view the CM and DM components of a signal on a usual two channel scope. The reason for this to be able to verify whether a noise superimposed on a signal is CM orDM. Regarding my ...
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0answers
59 views

Differential Clocking resistor and capacitor choices

I am working on generating a 2MHz differential clock signal for a DDS chip. I have been given a PCB with a design that I am unsure can work or what the thought was behind it. If anyone could help with ...
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1answer
51 views

I need to find Vin max(Common Mode) and min(common mode) for given circuit.

please let me know how i can proceed with this circuit
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104 views

Differential amplifier circuit - output voltage

I have a homework problem. We have a differential amplifier circuit with two supply sources: \$V_{CC}=-V_{EE}=5V\$, that has two identical NPN transistors and three identical resistors. T2's base ...
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0answers
40 views

How can I bias this Differential amp. circuit at the best operating point?

I'm looking to find a way to bias this circuit: I've written down a couple of equations for DC load line(and also DC half circuit): and these two as AC Load line: Rc is given by 1K and you can see ...
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0answers
537 views

Are common and differential mode chokes interchangeable?

Is it possible to use a common mode choke as a differential mode by switching around one pair of wires and v.v. as shown on the drawing? Intuitively it seems that this should work. I need a power ...
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1answer
100 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 ...
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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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0answers
162 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
65 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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3answers
216 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
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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0answers
574 views

Sallen-Key with fully-differential output — options?

I have a single-ended audio signal that I want to low-pass filter and convert to differential (with GND as the OCM voltage — that is, when one output is X Volts, the other output shall be −...
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116 views

using the AD8475 as a single ended output

simulate this circuit – Schematic created using CircuitLab I am putting together my schematic and I am trying to figure out if I can use the AD8475 as a single ended output buffer. AD8475 ...
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0answers
396 views

Piezo speaker driver not giving full differential voltage - why?

I am trying to drive a piezo speaker at 20kHz with maximum voltage swing from a 10V source. Previously I had used a square wave plus its inverse to give the equivalent of 20V across the speaker but I ...
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0answers
905 views

Designing a Multistage Amplifier

I have to design a BJT multistage amplifier to meet a specification provided by my professor. The first stage is to be a differential amplifier, and the second stage is to be a common collector ...
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0answers
320 views

Single-stage amplifier biased by a simple current mirror device

the goal is to the Derive an expression for the voltage gain for the circuit below. the course notes I have is pretty vague, and I have no idea how they came up with the answer. is there anyone who ...
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0answers
688 views

How to calculate resistor values for CFO differential amplifier Op-Amps?

I know that resistor calculations for current feedback amplifiers is different from their voltage feedback counterparts ( especially in higher frequencies as they have small impedance in inverting ...
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0answers
253 views

Differential amplifier problem

I really can't determine what my professor meant by this. He wanted me to calculate parameters of BJT differential amplifier that will have -100 amplification for signals difference and -1 for their ...
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0answers
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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0answers
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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0answers
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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0answers
52 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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0answers
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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96 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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0answers
44 views

calculate the ouptut of two operational amplifiers in a series

i want to calculate Vs which is the output of this circuit simulate this circuit – Schematic created using CircuitLab so i just want to equation that can help me find Vs. please help me, ...
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0answers
23 views

Current mirror loaded differential amplifier with gate of current source as output

I'm trying to calculate the gain of this current mirror loaded differential to single-ended amplifier with output on the other side as opposed to the usual configuration. My result is 1/2 gm_N1(ro_N1||...
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1answer
63 views

input resistance of differential amplifier

i have a question about the differential amplifier i know that the input resistance for the common mode is Rin = rpi + 2 Beta Ree / 2 but my question is what is the input resistance for the ...
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38 views

Singled ended or Differential - Engine Control Unit

I know this topic has been beaten to death but I still have not got a clear understanding. Pardon me for my bad explanation as I am an automotive engineer by trade. I am simulating an engine knock ...
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1answer
44 views

How to find the Common Mode Rejection Ratio of this circuit?

My attempt was like, by using the formula, I can get, \$CMMR=\frac{\sqrt{2\cdot4\cdot8\cdot5\cdot10^{-6}}\cdot44000\cdot2}{x}\$ For the denominator, I used both 10% and 20%, but all the finals were ...
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1answer
51 views

differential measurement vs ground

I am looking to measure an incoming V vs ground with an ADC (MCP3424 or equal). The Vin vs Gnd can be anywhere from -1.5V to +2.0VDC. I looked at using an op amp with level shift, when I came across ...
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1answer
67 views

How to write inductor ODE equation properly?

I've drawn a following scheme, and now want to write ODE system for describing inner processes, in order to explore it: simulate this circuit – Schematic created using CircuitLab I wrote the ...