Questions tagged [circuit-analysis]
Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network. Consider using in conjunction with tags for the particular analysis technique(s) in question: "nodal-analysis", "mesh-analysis", "superposition", etc.
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Problem with Capacitive Feedback Amplifier
I am building a capacitive feedback amplifier whose schematic is shown below. The circuit has two inputs and two outputs (fully-differential). One input is wired to dc ground and the other to an input ...
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Calculating Equivalent Resistance between arbitrary pair of nodes in finite grid
I am having trouble understanding the concept of equivalent resistances. In the finite grid network pasted here, i know that if i want the equivalent resistance between the nodes at which the current ...
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RC Filter Analysis
Let the following circuit:
I was looking at some old youtube videos, explaining how obscure this simple looking circuit, here is my question, suppose that the AC voltage source \$ v_i(t) = A \sin(\...
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Parallel RC circuit differential equation for a mechanical engineer
For a mechanical engineering course in controls, I was asked to
Write the differential equation, state equation, and transfer function for this circuit
That's the full text of the problem, and the ...
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What are important applications of inductors in todays world? [closed]
Are capacitors more important than inductors? I really want a solid grasp of these 2 components so any answer is appreciated! Where are capacitors preferred to inductors ?
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What is the purpose of this audio transformer in the circuit?
I was tasked at work to build some boards, which take a 12 V input from a car audio amplifier and output a lower voltage signal for further processing in a soundcard.
Schematic:
simulate this circuit ...
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Why did this simple lead-acid battery charger fail?
The following schematic shows the simple circuit of an LED lantern. One day somebody connects it to the mains supply in order to recharge the battery after several months, but hears a loud sound!
The ...
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Do you really need input bias current cancellation resistors?
The below article is taken from TI's the Signal e-book.The article number is 10 page no 14.
In this the author says the reason for not using Rb and it is given below.
Thermal noise produced by Rb and ...
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Computing the voltage variation of a node in a linear circuit
I have the circuit shown below. I am trying to compute the variation of the node voltage \$V_{n1}\$ when the current sources attached at the output nodes change. This should be a straightforward thing ...
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STM32F030 Not able to Connect with ST-Link
I am connecting the CLK, RST, DIO, 3.3 & GND from ST-Link to the STM32 via a jumper. When I try to connect 3.3 & GND, the ST-Link disconnects immediately. Can anyone have a look & see if ...
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Mesh analysis of circuits
In this question we are required to find the nodal voltages and current in the circuit.
Why is the 3A current not divided at node (d), that is, one going in 5 ohm resistor and other towards the ...
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JFET-BJT amplifier circuit: AoE figure 3.31
I have two questions about the following JFET-BJT amplifier circuit. This circuit is presented and analyzed in paragraph 3.2.3D of the Art of Electronics.
The book comes up with the following design ...
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Help me Solve this circuit [closed]
(a) The initial conditions of the circuit (\$t = 0\$);
(b) A differential search that allows the circuit response to be determined;
(c) The damping coefficient and the resonance frequency;
(d) The ...
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alternating current in a RC circuit
This is a problem from a book.
Consider a parallel arrangement of a capacitance C and a resistor R. An external voltage \$V(t) = V_0coswt\$ is applied to this arrangement. Show that the total current ...
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Correct methods to do source transformation
What are the conditions to check before doing a successful source transformation without any errors. Is this example correct--
The source transformed-
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How does this work? Finding final voltage of capacitor in a RC circuit step response problem
There is a circuit with a switch which was in position 1 for a long time and is now in position 2. I attached a picture of the given circuit below.
Once in position 2 I need to find the final voltage ...
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Output voltage for two linear circuits whose out put are shorted [closed]
Two identical linear circuits are given each with an input port and an output port (both input and output being voltages). Their outputs are shorted and 3V and 1V are applied at the input. The output ...
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Pull up resistor question
Like many others I'm in software so apologies in advance if the question sounds dumb. I watched some videos, read some articles and also read some answers here, such as: Pull-up resistor clarification
...
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Ćuk Converter circuit analysis
I am confused by the current path of the Ćuk converter when it is at position one where the mosfet is conducting
The circuit analysis results in the two circuits below. What is the current path? Why ...
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Undefined parameter name error in Hspice
I am trying to run this Hspice code in Spectre.
I am getting this error
Can anyone help me what is the mistake?
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Current in a circuit is 50% lower than predicted by Kirchhoff's law
I am a math teacher and in my Linear Algebra class we were solving systems of linear equations that come from Kirchhoff's laws. We were trying to use a physical circuit to validate our computations. I ...
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Can anyone please help me with this circuit analysis question ? I dont know which technique would be the easiest to solve this question? [closed]
1: So this is a question about sinusoidal steady state analysis and i dont know which technique would be suitable for solving v(t).
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Detect 220Vac signal on Microcontroller
I'm developing a module and the control switch may be at long distances.
Considering I have the 127 or 220Vac input, I want to use that for switch signal. I believe is better, instead of making a ...
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Wave shaping circuit with active filter tuned oscillator
Figure: OP amp filter circuit.
This is a problem from a book "Microelectronic circuits",7e by Sedra and smith, OUP.
The two op amp circuit is called an Antoniou Inductance circuit as it ...
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measuring elapsed time when voltage reaches specific value in RC analysis
I am trying to measure the time a capacitor has reached 63.22% (1 tau) of the total voltage for a basic RC circuit. I can measure it directly from the .TRAN output,...
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Stuck on Thevenin Equivalence Problem [closed]
I'm supposed to find the necessary elements for the Thevenin equivalent of the pictured circuit. That's \$V_{TH}\$, \$R_{TH}\$, and the Norton current (\$I_N\$). I'm also required to show that \$\frac{...
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Problem with Chopper Opamps Gain
I am simulating the open-loop gain of a chopper opamp. The schematic is shown below. The chopper opamp consists of an input chopper, a single-stage op, and an output chopper.
I ran both the AC and ...
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Why is my "common gate amplifier" introducing a zero when it shouldn't be introducing one as per theory?
I am trying to simulate a cascode circuit followed by a source follower in LTSpice and observe its frequency response. I added a 100GH inductor to serve as negative feedback only for DC, i.e., the ...
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What is the right way to model power converter noise? Should it be considered as voltage or current?
This reference models the converter noise as voltage and the filter is an LC filter (from right to left).
Another source mentions the converter noise should be considered as current source. Again ...
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Bandwidth of simple FM transmitter given in schematic?
The following circuit is a basic FM transmitter, which broadcasts for a limited range of about 10 meters. It is tuned by an LC tank circuit, where the capacitor is a trimmer one. I want to know the Q ...
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How does the speed controller of this cassette tape motor work?
I am new to this area and for my first project I am trying to build a cassette player.
I am up to the point of figuring out the speed control of the motor.
I have been analyzing this cassette player ...
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How do I calculate total resistance?
As far as I understand, two resistors are connected in parallel if the node at both ends of both resistors are the same. And in series if only one node is the same.
But what if between two resistors ...
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How to increase the carrier signal voltage of RF AM modulation?
The circuit below is an example for RF modulation:
Question is about carrier signal voltage of RF AM modulation.
What happens when the message signal is amplified and it would have more voltage and ...
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How is an inverting opamp adder circuit able to regulate its feedback?
Consider the typical opamp inverting adder as follows:
Why don't resistor Rl and R1 form a resistor divider and impose 2.5V upon inverting node and drive it to saturation. How is opamp's feedback ...
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Calculate the output voltage from following figure if input is 1V [closed]
Figure shows a circuit consisting of an ideal op-amp. If the input voltage is 1 V calculate steady state amplitude of output voltage.
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Optocoupler not working properly, current in diode
I have got an optocoupler to switch an output between 0V and 3.3V. That output is also inverted with a NOT gate, but for simplicity, we could focus on just Out_Enable1 signal. As far as I understand, ...
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Capacitor PPM equivalent?
I have a 10nF capacitor who's datasheet gives 10% tolerance, and 15% total tolerance over temperature (-55 to 125C). It does not give it in ppm, for simulation purposes, how would I calculate it's ppm ...
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Distortion pedal volume and tone control messing up circuit
I have built a distortion pedal with 3 variable controls: gain, tone and volume. R8 is my gain control (it will be a potentiometer with 50k to 500k resistance.) R5 is the tone control, (low pass ...
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Why are these independent loops?
According to my textbook, abca with 2 ohm resistor is independent. A second loop with 3 ohm resistor and the current source is independent. The third loop, with 2 ohm resistor in parallel with 3 ohm ...
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Finding Norton current
I am trying to determine the Norton current between the terminals a and b of the network shown below. \$Z_1\$, \$Z_2\$, \$Z_3\$ and \$Z_4\$ could be resistors, capacitors or inductors.
To do so, I ...
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Effective DC Gain of a Chopped Opamp
I am studying a chopper amplifier circuit and have come across the idea of effective dc gain of opamp. The effective dc gain of the opamp due to chopping is the gain at the chopping frequency. Please ...
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The zero-input and zero-state response of a circuit consisting only of a dc source and a capacitor?
From my understanding, the zero-input and zero-state responses of an RC circuit can be found by solving for the homogenous and particular solution of the ordinary differential equation found using ...
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Why is the voltage \$V_c\$ equal to the voltage source?
As I said in the title why is \$V_c = V_{\text{in}} = 12\$V?
I tried applying Kirchhoff's voltage law (not sure whether I'm allowed), assuming that the current of the circuit moves clockwise I get :
$...
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Switched capacitors in an op-amp circuit
I am having trouble solving part (b) of this task.
I would expect to achieve charge conservation equations, but considering that the inverting input of the op-amp is shorted with the output terminal ...
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Derive equation for half-wave rectifier with inductor and DC source load
I am trying to analyze a half-wave rectifier with an inductor and DC source load. I am reading a book on power electronics and the equations the author came up with are shown along with the circuit. I ...
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Node voltages with dependent current source
This is the way I set up this problem:
v1-v2/5 + v1/5 = 2I0/20
Io/10 + (v2-30)/10 = v1-v2/5
Setting it up that way gives me a v1 of 28.8 and v2 of 7.8, which isn't correct. I'm supposed to be getting -...
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Why are IC and IE different? Aren't the two 1k ohm resistors in series and thus the current through them should be the same?
Honestly I don't understand how this circuit works and that's why I'm thinking that IC and IE should be the same.
Note: This problem is copied from Engineering Circuit Analysis Hayt, Kemmerly & ...
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How can I find the voltages V1 and V2 of the circuit?
I know I can reduce the resistances and make the problem a lot easier.
But my question actually is how can I solve for V1 and V2 using kirchhoff's laws? Because I tried to do it this way but I can't ...
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Is the Thevenin resistance correct ? Also does it matter whether the load is connected in parallel or series?
So i figured out that the voltage was 9 volts by using mesh currents .
My Thevenin resistance however came out to be 60/16 or 3.75 ohms . I short circuited the voltage sources and open circuited the ...
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Can I determine three circuit elements from an impedance curve?
I have impedance data (\$|Z|\$ and \$\phi\$) of a diode, measured at a fixed frequency but depending on the applied bias. The diode can be modeled as a series resistance \$R_s\$ and a parallel circuit ...
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