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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RS422 charachteristic impedance and its variants

This is regarding the RS422 bus hardware. I have a receiver that has Vih of 1.8V and a max of Vcc(3.3V). Supposing I link a driver and receiver up. The driver,as per the EIA RS422 standards state ...
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1 answer
330 views

Interfacing an RS422 driver and receiver

I am trying to interface an RS422 driver and a receiver. What are the important voltage parameters I need to understand when selecting the relevant chips. From what I understand the most important is ...
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RS422 basics understanding

I am understanding the basics of RS422. Now, consider a driver (RS422) connected to a reciever. Now, we have a termination resistor of about 100Ohms or 120Ohms. Now, imagine the driver sends out Voc ...
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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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173 views

Differential pair circuit

I have the following differential pair circuit that is designed to have a diff gain of 4 V/V and a power consumption of 1mW. The transistor should be biased to have a Veff=0.3V and should have a ...
2 votes
1 answer
145 views

Testing Triple Differential Driver AD 8147

I'm working on project that requires me to convert my single ended RGB signal(VGA from PC) to differential ended RGB. I made this circuit given below the only change that I made was using a 4.7K ...
2 votes
1 answer
1k views

How to compensate for op-amp offset voltage for AC current?

For simulation purposes, I know that one can setup a difference amplifier configuration and compensate for offsets for DC current by adding a voltage source on the inverting input, and adjusting it's ...
22 votes
5 answers
35k views

Difference between differential op amp and comparator

What is the difference between a differential op amp and a comparator? I know a comparator can only give me two values (the supply values). The differential op amp amplifies the difference between ...
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1 answer
681 views

Definition of differential input resistance

What is a differential input resistance (\$R_{\text{id}}\$) in a differential amplifier? Could you show me the expression for this quantity? I think it is: $$R_{id}=\frac{v_{id}}{i_{id}}=\frac{v_{i2}...
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Kirchhoff's Laws on Series-Parallel Circuit

Consider the circuit The writing in red are my own additions (so let me know if it's wrong). From Kirchhoff's Laws, I obtained \$I=I_{2}+I_{1}\$ \$I_{1}=I_{3}+I_{4}\$ \$V=V_{C_{1}}=V_{R_{2}}=V_{...
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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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3k views

Differential voltage measurement on shunt resistor

I trying to build a simple differential measurement circuit to feed a analog to digital chip to monitor current consumption of a board with an Arduino. So I decided to go with a "traditional" ...
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1k views

Small-signal operation of the BJT differential pair

This is a solved example from the textbook, but I I don't understand how VBE1 and VBE2 were obtained. like why VBE1=VBE+Vid/2 ? I know about the voltage difference but why is it positive here and ...
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188 views

MOS amplifiers CMRR question

As we know ,in MOS differential amplifiers we have Rd mismatch and gm mismatch.These mismatches have effects on the differential amplifier.Which of the effects of these mismatches is more dominant in ...
3 votes
1 answer
292 views

Use different footprint for a SATA connector

I am designing an Linux Board which needs a SATA connector. Now im faced to choose between 2.5 HDD SATA connectors and the new mSATA (mini PCI express) connectors. For compatiblity and usuabillity ...
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1 answer
340 views

USB to Optical Signal Conversion

I have a video signal coming from a composite video out (we can ignore audio at this point). Products such as EasyCAP can convert such signal to usb differential(d+/d-) signal. Arduino/raspberrypi can ...
1 vote
1 answer
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How do I connect these two parts of solution?

A differential amplifier is fed in a balanced way with the source resistance Rs which is in series with each base.Show that a mismatch ΔRs between the values of the resistances of the source brings a ...
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1 answer
705 views

pseudo differential input of amplifier

The Signal Recovery Model 5184 is an ultra low noise preamplifier. The product description says ... and incorporates a special pseudodifferential input stage that can be floated to give the ...
2 votes
1 answer
2k views

Differential ADC input buffer

I am trying to make 10Mohm of input impedance into a ADC (CS5530). I am planing to use differential input buffer to ADC so I am trying to use TI's document as reference. I tried the one differential ...
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1 answer
919 views

Negative input voltage on Isolated Differential ADC

I am trying to interface with negative voltage input signal ranging from -5V~5V or -10V ~ 10V. Since the input signal may be floating or have ground reference, I am planning on galvanically isolating ...
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1 answer
397 views

practical concideration for op-amp differential amplifier

i'm trying to make a current sensor based on an op-amp differential amplifier with a unity gain (all resistors are equal so to have the best CMRR.) The output of the op-amp differential amplifier ...
8 votes
3 answers
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Voltage and current measurement of battery Single ended or differential?

I am trying to measure battery's current and voltage for a battery charging/monitoring project. I have read all about current sensing (including high side & low side sensing). And i have decided ...
8 votes
1 answer
1k views

How does this BJT transistor circuit works?

I just wanted to know a little more about this circuit about how it works a more in depth analysis I mean. I know there's some kind of differential amplifier and a Zener diode for voltage regulation ...
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2 answers
813 views

Choice between Pseudo-Differential Unipolar and Pseudo-Differential Bipolar ADC Input

While reading about Pseudo-Differential Inputs for ADCs, I came across the document below from LT. Link : http://cds.linear.com/docs/en/product-selector-card/2PB_sarinputtypesfb.pdf Below are copied ...
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1 answer
879 views

How to design a single-ended to differential converter with audio transformer?

I am attempting to build an audio amplifier that accepts an arbitrary stereo input signal via a 3.5mm connector. My objective is to convert that single-ended input into a balanced AND differential ...
3 votes
2 answers
9k views

Floating charge pump for high side N-channel MOSFET bias

This question is derived from this one. I'd like to keep gate on for an indefinite period of time (100% Duty cycle) and for that I'd like to use charge pump since idea with relay is not attractive. ...
3 votes
3 answers
639 views

Is single ended amplifier a subset of differential amplifier?

The reason I'm asking this is that when I read about CMRR issue in amplifiers I only see differential amplifiers as if it is only a diff. amp. issue. But isn't a single ended amplifier also a ...
3 votes
4 answers
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chopper-stabilized op-amp latching up, cheap op-amp doesn't

I have a simple pressure sensor buffer/amplifier that I'm experiencing some weird latch-up when using a fancy chopper-stabilized op-amp for U2. The pressure sensor is an MDPS-002 (the 700kPa version)....
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Explain to me what is this exercise about?

A differential amplifier is fed in a balanced way through the source resistances Rs which are in series with each of the bases.If there exists a mismatch ΔRs between two source resistances draw the ...
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1 answer
121 views

Electrophysiology amplifier problems (electrode design help)

I have been working on a small differential amplifier that will ultimately be used for whole nerve recording from lobster connectives. Throughout the process I've been testing the amplifier using ...
1 vote
2 answers
207 views

Differential op amp circuit explanation

I don't understand how to calculate the voltage that should enter the inverting terminal of the amplifier[V-] Could you help me to find out how this circuit works and why the output, when Vin is zero, ...
5 votes
2 answers
5k views

Current source as load in a differential amplifier

In Design of Analog CMOS integrated circuits by Razavi I found the following differential pair design. It uses a MOS as load and it acts as a current source. My question is how should you bias the ...
2 votes
2 answers
3k views

DC output of differential amplifier with active load

I've been looking around for some kind of explanation on how to get the output DC voltage on a single ended differential amplifier with active load like the one in the image It's just that i don't ...
2 votes
1 answer
114 views

Buffered feedback circuit analysis

I saw this circuit while going through some circuits and have been trying to solve it since. I get confused at multiple points while solving for the current. Since there is a buffer for feedback,...
2 votes
1 answer
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How do I derive \$(i_x)/(V_A-V_B)\$ in this circuit?

I have this circuit below: http://qph.is.quoracdn.net/main-qimg-a5380479d6b436dcfb9a36252ac3f1c1?convert_to_webp=true Can I make the small signal equivalent circuit as shown below and when doing the ...
2 votes
2 answers
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Is \$V_A\$ or \$V_B\$ the inverting input here?

Is \$V_A\$ or \$V_B\$ the inverting input and why?
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"Differential Input Voltage" of "Fully Differential I/O Audio Amplifier" (OPA1632)

I want to use an OPA1632 as a symmetric signal receiver. The datasheet states: Supply Voltage, \$±V_{S}\$: ±16.5 V Input Voltage, \$V_{I}\$: \$±V_{S}\$ V Differential Input Voltage, \$V_{ID}\$: \$±3\$...
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Can you explain this differential amplifier exercise to me?

So we have the exercise in the figure The figure is The solution according to the book is VE=-0.7 Volt thus I=(-0.7+5)/4.3=1 mA so re= 50 ohm.Why is re=50 Ohm here? a) Ad=V0/Vd=α*2/2re .Why is ...
4 votes
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Impedance matching components with Ethernet

I’m designing a small switching circuit for 1000Base-T Ethernet and have a concern regarding impedance. The board design consists of 3 shielded Ethernet jacks and 4 DPDT relays (here) made for high ...
4 votes
3 answers
970 views

Why does Ethernet on UTP have much greater range than other modern protocols?

OCuLink, SATA, USB 3, and Displayport all provide on the order of a few Gbps per signaling pair, and are limited to a cable length of just a couple meters. Ethernet via comparable cabling provides ...
2 votes
1 answer
4k views

What does pseudo-differential mean?

I often read the term pseudo-differential when looking for ADCs. I know common differential means that the ADC measures a difference between two of its pins (AN+, AN-). But what is the difference to ...
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ADC Differential inputs

I am trying to feed a 5V signal to AD7705 which is a 16 bit ADC and expects differential inputs. Do I need to divide my 5V signal using bridge and then feed it to the ADC or can I use it as a single ...
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1 answer
530 views

Single-Ended Input operation of Differential ADC

I am looking at purchasing a 14-bit ADC chip (http://www.farnell.com/datasheets/1882573.pdf) for a battery monitoring project that I am working on, and am using a differential amplifier measuring ...
2 votes
1 answer
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Current mirrors as active loads in BJT differential amplifier, what does that mean?

I have seen current mirrors being used as current source in differential stage of an amplifier design. The reason given is that the current mirror has a very high output impedance and behaves like an ...
2 votes
4 answers
1k views

Differential Amplifier doesn't output the expected voltage?

I have the following differential amplifier in simulation. According to the theory I know, the output should be 0.2V - the difference between the two inputs at 2V and 1.8V. What am I misunderstanding ...
2 votes
2 answers
198 views

CML signal to ground terminated line or peak sensing ADC for short pulse

I'm currently designing the prototype of a timing instrument. One sensor gives an analog CML (current-mode logic) signal, from an amplifier (ADN2880). One end of the pair is routed to a comparator (...
4 votes
1 answer
2k views

BJT differential amplifier output saturation

I'm making a long-tailed pair amplifier using a current mirror, the circuit has the following layout: I simulated it on PSpice and it worked, you can see the bias here: I tested it in the real ...
2 votes
1 answer
2k views

Create a differential output signal

I need to supply the galvo driver with a signal "Voltage Range ±3.0V p-p or ±10.0V p-p (Differential Input)" - that's what it says in the datasheet. I have a 0-5V single ended DAC and differential ...
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Isolation on outputs

To measure a voltage in a (potentially dangerous) external system, people typically use a differential amplifier or even an isolation amplifier, something like this: simulate this circuit – ...
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885 views

usbOTG can I invert the D+ and D- diff pair? [duplicate]

Can I invert the D+ and D- in a USB OTG connection?, would it work? I know that in some protocols like PCIe you can do it, but Im not sure about usbOTG.