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Questions tagged [impedance]

Impedance defines the voltage/current characteristic of any dipole circuit.

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LCR meter U1733C - R range mesurement

I have the LCR meter "U1733C" and I am little confused about the "R" scale. As I understand (the manual doesn't say it clear - maybe it is self-evident and I am missing something) ...
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Resistance Vs Reactance Definition

I am trying to understand the practical distinction between resistance and reactance. As I understand from all what I read the resistance is responsible for the current flow and the reactance is ...
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Difference between characteristic impedance vs complex impedance

Are there any differences between complex impedance of antenna pcb trace vs characteristic impedance of antenna pcb trace. This question rised up because of online pcb trace impedance calculator doesn'...
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Impedance of different track widths - Should I compute the average width?

Assume that you having one track that goes from 0.11mm in width to 0.09mm in width. I want to compute the impedance, but I need to select the width. What option should I select? The largest width of ...
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Why have some wide trace at the begninning, but smaller trace at the end?

Why have some wide trace at the begninning, but smaller trace at the end? This example shows traces that goes into a BGA processor with pitch 0.5mm. From the begninning it's 0.09mm in width. At the ...
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Voltage drop of each load in the radial network

How do you find the voltage drop and external loop impedance of each lighting load in the picture attached?
Chukwuma Collins Ezenyinwa's user avatar
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How is length adjustment calculated if you have a pull-up resistor?

Let's say that I have a point A and a point B. In between there must be a conductor. It must have a certain length. But I have to hang on to a pull-up resistor as well. But I can do that at point C. ...
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Load pull testing transceiver LNA input, impedance tuner DIY alternative

Transceiver vendors not always provide best components for input impedance matching in all variety of frequencies range that transceiver itself support, often provide impedance matching network ...
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Match 50 ohm impedance to LNA input impedance

I have following PCB version of circuit: on SMA input we have antenna strictly matched to 50 ohm, then we have regular RF switch IC, after RF switch impedance matching network and final stage is ...
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PCB interconnect trace characteristic impedance (Z0) at low frequencies

In high frequency signals, we generally set the trace characteristic impedance between 50-120 Ω. Calculation tools, for example, use the impedance calculation tool designed by Altium Simbeor, and it ...
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Changing output impedance of a logic gate to 50 ohm

I making a simple circuit to take 10 MHz output from a GPS module and calibrate a frequency counter with this 10 MHz signal. I have already found a circuit designed by radio amateur ZL2PD. Circuit ...
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"50 Ohm" vs "50 Ohm terminated" in ACV accuracy specs

In the accuracy specifications for an AC voltage measurement with a Keysight 3458A, there is a distinction between source impedance of "50 Ohm" and "50 Ohm terminated" for the &...
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Calculating output impedance of amplifier to match to 50 Ω

Below is a schematic of an amplifier. The inductor used is a 1 μH inductor, emitter resistor is 2.2 kΩ. The bias resistors are both 200 kΩ. The capacitors are both 1 μF. I am planning to design a ...
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Is it possible to match impedance "with lower parasitic capacitance", or is parasitic capacitance itself a part of impedance

Parasitic capacitance makes the signal rise and fall slower, so I want it be as small as possible, but when I try to adjust parameters in Altium Designer (e.g. trace gap of a differential pair) for a ...
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How to calculate the impedance accurately?

I connected a circuit as shown in the following figure. The device under test (DUT) is powered by a battery. The negtive pole of the battery is connected with the conducting housing of the DUT, while ...
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Impedance controlled PCB for USB 2.0?

We're doing a PCB for a customer that has Impedance controlled tracks for a microcontroller that seemingly might be max USB2.0, judging from lack of multiple data lines and the fact it goes in a micro-...
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Is the reason for guitar "tone suck", i.e. loss of high end frequencies with impedance mismatching, actually due to high reactance?

When connecting a guitar's output to an input with insufficiently high input impedance, the signal is undesirably filtered, which is referred to as "tone suck". To deal with this, it is ...
interoception's user avatar
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PCB Impedance mismatch?

I created a very simple PCB, two layers for testing a OXCO. The overall circuit is as follows: Now, so far so good from the testing point, I got what I expected: A square wave signal with a maximum ...
Ken90's user avatar
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What happens if there is an impedance mismatch on differential pairs? [closed]

What do we encounter if the impedance changes along the way? For example, what kind of problem can we encounter when one of the two complementary PCB's is 90 ohm and the other is 100 ohm? For example, ...
esat's user avatar
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Ideal headphones impedance/sensitivity for op-amp

The maximum output voltage of my audio source is 3 Vpp and the maximum output current of my amplifier (op-amp AD4075-2) is supposed to be 45 mA. What would be the ideal impedance and sensitivity of ...
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Why does the volume of the preamplifier change when a second audio signal is mixed? [duplicate]

I have two audio signals leading to the amplifier input: the first one comes from the preamplifier, the second one from the audio output of a smartphone/tablet device. Both have a resistor and a ...
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Timeout Error when Reading Measurements from Impedance Analyzer Solartron 1260 via NI MAX using IEEE 488/GPIB

I'm working with a Solartron A1260 Impedance/Gain-Phase Analyzer and attempting to read measurements on the NI MAX interface connected through a PCI bus. The analyzer itself is functioning correctly ...
ABDUL MAJID's user avatar
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1 answer
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What's the output impedance of this circuit?

The following is a question from 8.18 in Design of Analog CMOS Integrated Circuit, page 342. Consider the circuit in this following figure. \$(\frac{W} {L})_{1-4} =\frac{50} {0.5} \$, \$|{I_D}_{1-4}| ...
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Why is a bandwidth discrepancy occurring despite consistent Q factors in the given Graph?

I was trying to do curve fitting the common-mode choke in CST Studio according to the selected S4P file from TDK (ACT1210G-800-2P-TL05). However, the common-mode impedance measured from the file does ...
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Calculation of Load Impedance of three phase Inverter

Could anyone here please assist me how the Equivalent impedance of Load of three phase inverter is calculated from the Inverter parameters shown in below screenshot? This screenshot is tutorial ...
Alison's user avatar
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2 votes
2 answers
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Why is insertion loss independent of load resistance?

I am studying about attenuators and read from my lab sheet that if the source impedance equals the characteristic impedance of the attenuator, the insertion loss given by \$N = \frac{v_{1}}{v_{2}}\$ ...
radastro's user avatar
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How do we calculate the current through two impedances in series by knowing the voltage of one and the impedance of the other?

I have a problem where I know the apparent power consumed by a Y-connected load and the line impedances, which I already reduced to work just with the line power (300kVA): the source and two ...
K. Rincon's user avatar
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1 answer
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Measuring impedance on VNA

Question: I would like to measure the impedance and phase of an electric piezo tranducer with a resonant frequency of approximately 1MHz - a graph of impedance in Ohms as a function of frequency. ...
piotr's user avatar
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Equivalent impedance for R-C configuration in op-amp input

If I have a circuit like this, how can I obtain the loop gain, since the capacitors and resistors are not either in series or parallel? If the feedback resistance is \$R_f\$, then I have something ...
ludicrous's user avatar
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Real resistance at AC vs DC frequency?

I am using an LCR meter to measure the characteristics and impedances of various coil antennas. This LCR meter can measure both real and imaginary components of impedance at a certain frequency (R and ...
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2 votes
3 answers
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Does coiling a transmission line affect its characteristic impedance?

If I take an advertised 50 ohm impedance cable and turn it into a coil will this change its characteristic impedance from 50 ohm to something else? My intuition tells me it should as if we look at one ...
Swiss Gnome's user avatar
3 votes
3 answers
598 views

Input impedance of a buck converter

Is there an approximate formula for calculating the minimum value of the input resistance (or impedance) of a switching regulator? I found several formulas but can't figure out which one to choose. I ...
Gigapel's user avatar
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What actually causes the need for a balun on a dipole fed to coax

My current understanding: The line in the center of the coax and the inner side of the shield are the current paths, as in the signal/field propagates between these two, (i can't therefore imagine it ...
George kirby's user avatar
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Current sensor output impedance information

I am using ZXCT1084QE5TA high-side current sensor, upon inspecting datasheet I came across this very weird output impedance information, which I don't really understand. There are two versions of ...
Dominykas's user avatar
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1 answer
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External circuit to increase the series capacitance of a resonant circuit

I am working with a long-range reader and antenna coil for a low frequency (135 kHz) RFID application (please see the basic representation below.) The reader features some unknown source impedance, as ...
tomhebe's user avatar
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7 answers
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If RF signals require matched impedance to remove reflections, why do approaches to shunt noise need only a “good path to ground?”

From my understanding, for signals to propagate without reflection the impedance of the path must be constant and can be shown via the telegraph equation. When it comes to noise on the line, for ...
George kirby's user avatar
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2 answers
78 views

simulation output impedance of ADA4522-1

I have been trying to simulate the output impedance of ADA4522-1 using LTSpice. I have added a sinusoidal voltage source with 1Vp-p voltage at 1MHz at the output and connected the input to ground ...
Fateme's user avatar
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Half Bridge Impedance Matching

I’m currently building a half bridge induction heater and can’t understand impedance matching for the life of me. Here’s an example of a basic half bridge induction heater. How and why was 45uH ...
ElectronicsNoob's user avatar
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3 answers
143 views

Adding series resistors to IC, increases input impedance?

Does adding series resistors to a comparator / op-amp IC increase input impedance? Is this a right way to do?
CopyCat's user avatar
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When the output power of an amplifier significantly varies despite having a load of much higher impedance than the source impedance

I was looking at headphone amplifiers, and you hear the same thing repeated over and over "at most source impedance is 1/8th the load". The point is to make sure the headphones have a flat ...
Goschie's user avatar
3 votes
1 answer
140 views

Is an RF sampler a good way to protect my network analyzer during high voltage impedance measurements?

When I characterise ultrasound transducers, I normally do it with a network analyzer in a shunt configuration - ie, I connect the transducer across port 1 of the network analyzer. This gives me plots ...
Chris Adams's user avatar
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2 answers
84 views

Antenna tuning and L/C matching

I see there are already a few questions asked wether it is better to physcally tune the antenna for said frequency and impedance or use a matching network. It seems the conscenus is often the physical ...
George kirby's user avatar
1 vote
2 answers
142 views

I would like to know the origin of the following formula

I don't understand what's in the red circle. Why is the unit 's' and what does 's' stand for? Why must we divide the current at Open-circuit test by the voltage at Open-circuit test? I don't ...
Noting's user avatar
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Conversion of radio emissions to decibels and role of impedance ratio to power ratio

This question is about a web article about radio noise suppression by Ferrite beads. The above diagram plots of a family of four curves for the ferrite bead. Each curve depicts the relation of ...
Jacob Miller's user avatar
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2 answers
81 views

Series resistor connected to the high impedance input pin of the integrated circuit

There is an integrated circuit(xtr111 datasheet) with a 0 to 5 volt input range (The 0-5 volt signal is applied as DC. That is, the signal does not change constantly and quickly.)and the pin has high ...
Electronx's user avatar
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Differentialy Fed Antenna Feeding Network

I need help with the feeding line for the following scenario. I have a dipole-like antenna for which I need balancing the input, see picture (dipole antenna used just for illustration; it does not ...
Humphrey Appleby's user avatar
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1 answer
80 views

Input impedance for analog signal [closed]

"The minimum specification for input impedance is the static input resistance and, if significant, the input capacitance, inductance, and leakage current." (Chapter 7.1, pg.43 IEEE std 1241-...
bb0667's user avatar
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1 answer
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JLCPCB Solder Mask Parameters for 4-Layer Impedance Controlled Stackup

I am a bit confused by the solder mask parameters, offered by JLCPCB on their Impedance Control page. There you can find "Coating Above Substrate C1", "Coating Above Trace C2", &...
Vulpecula's user avatar
1 vote
1 answer
62 views

PCB trace impedance test measure

I have PCBA for which I want to measure the loop impedance between the power connector and gnd ones. How can I do this test if the passive elements, IC and other elements already attached on the PCB?
Alan Alan's user avatar
1 vote
2 answers
66 views

Why is the inverting gain of this phase shift oscillator 8?

In this oscillator configuration, which I got from the textbook "Operational Amplifiers & Linear Integrated Circuits" by James Fiore (page 354, 3rd edition), since the gain of the ladder ...
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