Questions tagged [impedance]

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

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3answers
114 views

Should internal signal layers of a PCB have a ground pour?

I see a lot of discussion about using copper pours on the outer layers of a multi-layer PCB, as well as a single continuous ground plane on a multi-layer board, but there isn't a lot of information ...
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24 views

Measuring Forward Impedance of a pulsed drive circuit

Background: I recently built a thyristor driving circuit to supply a set number of trigger pulses to my thytratron (tetrode configuration). The spec sheet for the thyratron requires that my driving ...
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1answer
34 views

Finding and plotting the impedance

I have gotten some help from the community here and thus I have reached this. This is part of the circuit that I want to find the impedance simulate this circuit – Schematic created using ...
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21 views

DC Electronic Load in Constant Impedance Mode

I have an Electronic Load module that allows the UUT to be loaded in either Constant Current (CC), Constant Voltage (CV), Constant Power (CP), Constant Resistance (CR) or Constant Impedance (CZ) mode. ...
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1answer
29 views

Relation ship between Track width, Impedance, Dielectric and copper thickness

I like to know the relationship between different factors like track width, impedance, dielectric and copper thickness. After quite a reading I got to know that as the track width of a cline is ...
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2answers
276 views

Capacitor Impedance ESR vs Frequency Curve

Yageo's SMT capacitor datasheet lists the ESR vs. Frequency Curve show below: Note that impedance (Z) is listed in units (W). How can this be understood? Why is impedance seemingly not measured in ...
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19 views

Meaning of impedances in IEEE Test Feeders

I'm having a dilemma about impedances for different line configurations in IEEE Test feeders. What do these impedances mean for arbitrary configuration like Configuration 601: Do they represent phase ...
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1answer
15 views

Will multiplexing impedance measurements from the AD5933 act as a series resisitance?

Image of block diagram of the AD5933 at: https://www.researchgate.net/profile/Douglas_Dutra/publication/292976112/figure/fig1/AS:520210098917376@1501039160818/AD5933-Functional-Block-Diagram-10.png I ...
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1answer
36 views

Understanding Plot Showing Impedance, Resistance, and Reactance

I am looking at part of the datasheet for a hydrophone I am using in a project. It includes this figure, which plots resistance, impedance, and reactance vs. frequency: Part of my project involves ...
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1answer
46 views

Smith chart tutorial question

I am looking at a Smith Chart tutorial on the antenna-theory.com website. Unfortunately, I'm confused by one of the examples given...I don't get the same answer, so it's safe to say I'm doing ...
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2answers
32 views

Finding the network equivalent impedance Z(t)

I am a bit lost no how to approach this problem? What should I do to get the total impedance?
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1answer
57 views

RLC equivalent model and Impedance Smith Chart

I have done some impedance measurements on an unknown 1 port device. I have measured its impedance at different frequencies (from 10 MHz to 600 MHz) and I have seen it on the normalized (on 50 Ohm) ...
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1answer
38 views

capacitance vs impedance measurement

I've been trying to design precise distance measurements similar to the digital caliper or dial micrometer for my CNC project by capacitance sensing between prob and base metal. I can connect base ...
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1answer
56 views

Measuring the impedance of a transmission line

I designed a Tem Cell and I need to measure its impedance which I have no idea how I can do that. I have tracking generator, signal generator and 50 ohm terminations. So how can I measure the ...
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39 views

How to measure impedance of sensor's traces?

I'm designing a humidity sensor as a semester project and I want to measure impedance of these traces: I don't have specialized impedance measuring instruments for this. As I'm thinking, this should ...
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2answers
97 views

What makes a input GPIO pin so sensitive?

I know that an input pin has a high impedance, but how a high impedance makes such pin be so sensitive? According to https://forum.arduino.cc/index.php?topic=454553.0 -- #4 mentioned If the input ...
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75 views

Calculate actual power of speaker

I have a sound system: 8 speakers, 1 amplifier (4 channels). Speakers were connected in parallel. I want to calculate actual power on each speaker. Specifications: 8 speakers: Woofer (4): Power: ...
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1answer
42 views

Finding Impedances on a Network

Hey there the first part of the question (finding the new C value) is pretty easy. However I am stuck at the second part, it asks me to find the empadance values and etc. Can you help me with that?
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1answer
38 views

Agilent 4294A Impedance Analyzer: “Bridge Unbalanced” during calibration

I am having problems calibrating my test fixture for the Agilent 4294A Impedance Analyzer. The open measurement always works, but with the short measurement I always get the error message "Bridge ...
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0answers
26 views

Transmission Line Impedance 3 phase

I have the following question that I can't seem to figure out. The question ask to solve for the impedance of a 3ph transmission line. I've found the De (distance relative distance) and XL using the ...
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29 views

Infinite hexagonal impedance network with loads at specific nodes

It's been a couple weeks already that I am trying to solve this network on the paper. It consists on a infinite/periodical hexagonal lattice but with some peculiarities. First of all, this is not the ...
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1answer
22 views

High Impedance Load Driving with Mosfet as Common Source Configuration

I am just trying a design ac switch with mosfets which are connected as common source. Mosfets will drive 16.2A load in normal conditions. When I try to drive 10 ohm load with 162V (peak, 400hz), as ...
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1answer
58 views

Can Network Analyzer measure Impedance, Conductance, Susceptance or is there a device that does all?

I want to measure the impedance, conductance and susceptance of a large metallic object (about the size of a boat), and I want to know if it is possible to measure using Network Analyzer. If yes, are ...
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1answer
35 views

Linear Circuits - Erroneous first order gain observation

At uni, I carried out some lab observations involving a CR circuit (4V AC power source, capacitor, resistor in series, in than order) with the following parameters: simulate this circuit – ...
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2answers
61 views

How to measure the output impedance of a Zener diode in avalanche?

I'm trying to measure (on the bench) the output impedance of this:- simulate this circuit – Schematic created using CircuitLab It's a Zener diode, and the applied voltage is sufficient to ...
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1answer
81 views

“DC” Impedances seen looking into terminals of a BJT

Our professor in college was making us understand the stiff voltage-divider bias concept of a BJT. simulate this circuit – Schematic created using CircuitLab (Ignore the resistor and voltage ...
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1answer
47 views

How to calculate how much high ESR capacitance to smooth impedance spikes?

I am making a 3.7V to 5V voltage booster with 25x 100uF ceramic capacitors on the input and output (with room to add more if needed). I've been warned that having such high capacitance with such low ...
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1answer
52 views

Finding capacitive load driving capability of a Sine wave crystal oscillator

I will be using Crystek CCSS-945X-25-100.000 sine wave oscillator to drive the reference CLKin pins of TI PLL IC LMK04832 This sine wave oscillator will be on a separate PCB which we are calling as "...
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3answers
214 views

Is my understanding of output impedance for this transistor circuit correct?

Im having trouble to understand the meaning of output impedance of an active circuit and in this case the emitter follower. I have read several information but yet failed to get the meaning. Im ...
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2answers
51 views

What does it mean by input and output impedance in a signal generator?

I have a Lock-In amplifier that can generate sinusoidal signals up to 1.5V peak. There is an output port and input port, and I can obviously fix the frequency or amplitude of the signal I am sending ...
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1answer
42 views

Interpretation of scattering parameter

Currently I am (non-engineer) trying to understand the origin of measured scattering parameters with a vector network analyzer and a 2 port system. The second port is terminated with a matched load to ...
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1answer
31 views

Input and Output Impedances of Single to Differential mode converter

I have this circuit that converts a single ended input signal to differential output signal. I want to understand how to calculate or find out its input and output impedances? The two op-amps are in ...
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1answer
35 views

4 Pole Connector and USB cable compatibility

USB 2.0 Cable to pass through enclosure boxes. Are such cables able to be cut and connected (soldered) to the connectors pictured, and used without effect on their performance. Are there specific ...
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0answers
41 views

How do I use this impedance converter? (AD5933)

I want to measure a complex impedance with this impedance converter. I have been trying to find out how to use it, and I am confused. I figured I should put my impedance between VIN (5) and VOUt (6), ...
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1answer
107 views

Running a N channel MOSFET from 3.3V MCU

I am trying to run a low side switch with the 3.3V GPIO output of the Raspberry Pi (3.3v MCU), and for the particular transistor I’m using (IRF520) the 3.3V is barely enough to turn it on - is there ...
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0answers
43 views

Input and Output Impedances of Differential Amplifier

I have this circuit that is used to convert an incoming analog differential input signal to a single ended signal. The differential input is connected at IN+, IN- and the output is taken from OUT. I ...
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0answers
34 views

Common Collector Amplifier - Explanation?

I am new into electronics, and I dont get it how we find input and output impedance of Common-Collector Amplifier. I mean, I dont know what we are looking at when we are trying to find input and ...
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1answer
117 views

Connecting a 75 ohm device to a 50 ohm antenna

I have a device operating at low-frequencies (470 - 790 MHz, Television White Space), which works with a 75 ohm antenna. I want to connect this to a 50 ohm antenna instead. The 75 ohm end has an F-...
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0answers
59 views

Circuit Analysis: Difficulty in obtaining a current through a resistor?

I'm solving a problem that requires I compute some impedances, and then the current through a resistor. I obtained some of the impedances*, but don't know how to get the second part (current). ...
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4answers
162 views

Impedance Matching Long 2000 meter Transmission Line

My apologies if this isn't the most appropriate forum to ask this question, but I have found the response from users on this form to be extremely helpful in the past with my electrical questions. I ...
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3answers
189 views

How does Laplace transform include the transient response?

When we provide a sinsusoidal input, the evaluation of the solution of the differential equation head-on becomes horrendous. So we give an imaginary, complex exponential input and solve the ...
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1answer
38 views

Parallel of transformers. Is R/X condition necessary?

Let say I've got two transformer T1 and T2 with both the same voltage ratio. Each transformer has an internal impedance Z1=R1+jX1 and Z2=R2+jX2 respectivley. Also each transformer has a power capacity ...
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0answers
26 views

Input Impedance of BJT CE Configuration different from Multisim simulation

So as I derived, my input impedance should be Rb||rπ. But by substituting the value I obtain via the AC analysis from Multsim, I got different values. Tried a few times but still, the input impedance ...
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0answers
44 views

Modifying the volume pot in a stereo amplifier

This must be a rather basic question. I have stereo amplifier with a 30K potentiometer serving as a volume control pot (two of them ganged together, to be precise). The pot is connected as a classic ...
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1answer
32 views

Current when switching on with inductance. Role of Reactance?

When switching on the current through a coil it can be described as: \$ I(t) = \frac{U}{R} \cdot (1 - e^{(-x\cdot R/L)}) \$ For a sinusiodal current the complex resistance for a circuit with ...
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2answers
60 views

Low impedance voltage testing (LoZ)

Is there any issues with using low impedance mode on a multimeter for day to day testing on mains voltage 240Vac or if this mode should only be used when testing for phantom voltage? Is there any risk ...
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3answers
59 views

Impedance match Fishman guitar pre-amp to IRIG2HD

I'm looking for some help in understanding impedance matching. I'm hoping one or more of you technically savvy electronics folks will jump in and give me a simple circuit recommendation. ...
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3answers
108 views

Computing the voltage across a parallel LC component at resonance?

Problem For the circuit illustrated below, I am trying to compute the sinusoidal voltage across resistor \$R_{1}\$ when the parallel LC component is in resonance: I setup my problem with the ...
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1answer
80 views

How to know what this impedance is?

So I'm doing experimental work on an unknown impedance. I used a RLC meter for frequencies of 100, 200, 500, 1k, 2k, 5k, 10k, 20k, 50k and 100k Hz. Now, I think the values I got for each frequency ...
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1answer
58 views

Understanding equation for the quality factor of an RLC circuit?

In my textbook for a course on Circuit Analysis I came across an equation for the quality-factor of an RLC circuit. However, I don't quite understand their reasoning. The explanation that follows is a ...

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