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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Impedance matching of USB device WITHOUT cable
If I understood correctly, when designing PCB with USB, the 90-ohm differential pair of D+/D- trace if for matching the USB cable differential impedance. Otherwise, there will be a signal reflection ...
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39 views
Gilbert Cell Output Current
I do not understand the basic of a Gilbert cell.
I see that as its output we consider the output differential current Io. But I do not understand it. Is the load connected between the points 1 an 2? ...
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40 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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45 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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55 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 ...
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57 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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252 views
Voltage output waveform of a differentiating amplifier
I have the following picture of the input and output voltage waveforms from a differentiating amplifier as shown below:
And the schematic is as shown below:
My teacher claimed that these waveforms ...
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46 views
A Differential equaition for signals and systems
In a given system which described by:
when the start conditions are zero.
i need to find the values of 'a' and 'b' (which are Real constant numbers) which assure that:
the system is Linear.
the ...
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70 views
differential grounded coplanar waveguide, GND-sig-sig-AVDD instead of GND-sig-sig-GND
I know we can route microstrips on top of both ground and power planes, but can we use Grounded coplanar in this arrangement?
bottom is GND
In top layer we have one GND and a PWR.
All gaps are 0.15mm
...
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43 views
Bonding DC Minus to Ground with Resistor for Remote Power?
Layout:
I have a system that has 3 serial networks that run a variable length with one central processor talking to multiple endpoints via Modbus RTU, Canbus, and another rs485 that talks a protocol ...
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45 views
Calculating current and voltage from RL circuit through differential equation
Our circuit, where R1 = 3 Ohms, R2 = 1 Ohm, R3 = 2 Ohms, L = 5 milliHenry, and I = 0.01 Ampere.
Trying to figure out the differential equation for this circuit, as well as the current for the ...
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46 views
Is difference amplifier a differential amplifier with a voltage gain of one?
I see these two terms are used in same context.
But what is the difference in meaning?
Is difference amplifier a subset of differential ampfier with unity gain? I couldnt find a duplicate question.
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79 views
Bipolar signal used in differential ADC
I'm trying to find a way to convert a bipolar signal from a load cell (Futek) to an input for a differential ADC on a TIVA microcontroller(TI TM4C123GH6PM). The load cell's amplifier outputs a bipolar ...
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1answer
28 views
What causes the necessity for a bias resistor for floating differential mode inputs?
Following excerpt from a text says Figure a and Figure b are equivalent:
But in practice when Figure b is used we are recommended to use a 10k or upto 100k resistor between the inverting terminal and ...
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2answers
54 views
Noise mitigation in +/-5mV instrumentation amplifier?
I am building a differential amplifier to boost a 0-5mV (delta) signal off a load cell wheatstone bridge.
In simulation, the design works here (falstad):
(for those who have not used falstad circuit ...
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29 views
Line driver circuit with with MC3487 not clear
I am looking at an old Heindenhain LS623 optical slide with with a LM339N comparator and an MC3487p line driver. This slide is about 20 or more old and can not be repaired anymore by Heidenhain. I ...
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2answers
47 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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39 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 ...
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1answer
44 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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2answers
63 views
Can CML differential signal lines be flipped to act as a NOT gate?
If I want to invert a CML differential D-Flip Flop (Ex: hmc747lc3c) output before entering into a CML Counter(Ex: MC10EP016), is it as simple as flipping the signal lines before entering the counter? ...
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14 views
Single Ended DAC to Differential Input Modulator
I'm trying to drive a differential input IQ modulator (LT5571) with a single ended DAC (MCP4912) for modulation of a narrow band signal (~10kHz max).
Because of the nature of the low frequency ...
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44 views
HFA3096 transistor array breakdown voltage
In the book Learning the Art of Electronics, one of the labs is to build a differential amplifier with a CA3096 transistor array. The author admits that the chip may be difficult to find and gives the ...
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1answer
83 views
BJT differential amplifier: What causes common mode voltage gain?
In any normal op amp, if it was ideal it would have a gain such that the output voltage would be
However in reality this is not the case as there is a common mode voltage gain and hence in reality ...
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75 views
PCB HDMI high speed routing suggestions on my layout
I would like to get suggestions from all the high speed PCB layout experts on my PCB design.
I have a board with HDMI transmitter IC whose output is going to HDMI switch IC. The switch IC also has ...
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1answer
30 views
Discrepancy in datasheet for AM26LV31E?
The AM26LV31E datasheet, a differential line driver, states this (on page 4):
and this (on page 10):
At best, this seems ambiguous and, at worst, contradictory. Is the logic of this statement (8.1) ...
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54 views
Tail resistor in differential gain
Why doesn't the tail resistor feature in the denominator for differential gain (whereas it does for common mode gain) in the differential amplifier below? (Fig 5N.28 from Learning the Art of ...
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1answer
78 views
Ideal Op Amp Circuit
I have a question about the circuit below. I want to find Vo in terms of Vi. But I don't fully understand the principles about an ideal op amp's output. You will see my questions in bold at the bottom ...
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2answers
60 views
Differential amplifier with feedback resistor
In this circuit, if a resistor of 1 M\$\Omega\$ is connected between A and B, what is the effect on the stability of the quiescent point?
The analysis I made led me to believe it would provide ...
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78 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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49 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 ...
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2answers
115 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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72 views
Series RL current equation
I am trying to derive a inductor current equation for \$i(t)\$ in a series RL circuit when the switch is closed at \$t=0\$, as seen below:
I have posted my attempt so far but I'm having trouble ...
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40 views
Logic Style Level Vs Hardware Level
In the book: Advanced DPA Theory and Practice: Towards the Security Limits of Secure Embedded Circuits 1, it is explained that the countermeasures against Side-channel Cryptanalysis could be ensured ...
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2answers
119 views
Ground, common, and Earth ground confusion
I am learning on transmitters and input modules nowadays. But the usage of word 'ground' is confusing me. What does 'ground' mean there (earth or power supply common)?
If it is earth ground, why we ...
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50 views
Series RL Circuit Transient Analysis
I have worked through a question and I am unsure if my answer is correct. It is a series RL circuit with a switch that closes at t=0, supplied by a dc source, which I am trying to derive an expression ...
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38 views
How can I allow a smaller clearance value for differential pairs in Altium?
I have finished routing a PCB in Altium (v17) and am resolving design rules violations.
In short, everything checks out except differential pairs that are violating the ...
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2answers
145 views
Capacitor Voltage during Transients
I am starting to learn transient analysis series RC which requires our own equations to be derived, but I don't understand how the voltage across the capacitor is given in the equation below from a ...
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1answer
86 views
Does polarity of differential DisplayPort signals matter
I am routing a DisplayPort interface. I know from PCIe that the polarity of the differential pairs does not matter. So if it is helpful during routing I can connect the n to the p pin and vice-versa.
...
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86 views
How to measure the coil voltage in this circuit? [closed]
I want to measure the coil voltage (coil+ to coil-) of the following circuit with my microcontroller, but I don't know how. Do you have some hints or suggestions for me?
Thanks!
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52 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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52 views
Buffered Voltage Divider VS Differential(Subtractor) Opamp
I'm trying to understand which one of these circuits is the best choice for measuring 400VDC signal using a microcontroller . But at first look circuit number 1 makes more sense since it is giving the ...
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2answers
67 views
Does this audio amplifier do differential filtering?
I was looking at this schematic for a two-channel audio power amplifier.
The amp supports a bridged mode by means of an XLR connector and a switch. When the switch is in the XLR position, pin 2 (...
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2answers
43 views
Is it possible to very roughly estimate the CMRR degredation of a differential amplifier due to source imbalance given its datasheet
In the datasheets of differential input amplifiers there is a figure of merit called CMRR. This is normally experimentally measured at a particular frequency like 60Hz and presented in the datasheet ...
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1answer
63 views
To Fail-Safe or not Fail-Safe on RS485/422 Transceiver
I'm stuck on a PCB design issue.
I'm designing a new PCB (Daughter board) that will plug (via DB15-F to DB15-M) onto another PCB (existing Mother board) and the design intent is to take (from the ...
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1answer
59 views
PCB controlled impedance
Hi) I want to calculate the width of my 100Mb Fast Ethernet MDI diff pairs. I've got some software (TXLINE 2003 Microstrip). I have 4 layers. The second layer is GND, the third is power, top and ...
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Comparing differential-ended and isolation amplifier outputs for an “unbalanced” source input
I tried to simulate the effect of common-mode interference on unbalanced sources for three different inputs: single-ended, differential-ended and isolated. Below I inject a 1V common-mode voltage to ...
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69 views
How to conclude the necessity for unbalanced to balanced signal conversion for this scenario?
This is a bit specific system related question about simultaneous data-acquisition for several transducers. Therefore hope you don’t mind for the long intro and the question. It would be too implicit ...
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92 views
Contradicting ideas about differential signal route, confining fields vs Increasing impedance
By initial sense I think we must:
keep pair intra-distance as close as possible for field cancellation.
Fill surround of pair with GND plane and have via near to it to confine the fields, prevent ...
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2answers
61 views
Why Im getting shifted phase in the output voltage?
Why im getting shifted phase in the output voltage in this differential amplifier?
and how can I eliminate this shifted phase?
Second question is, I need to make a gain of 50 in the amplifier below, ...
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91 views
Which load resistance is connected to generator U2?
I have this op amp and one of the questions says
Which load resistance is connected to generator U2?
This is my attempt but I can not confirm if it right.
No it's not homework, it examples I'm ...
