All Questions
Tagged with ltspice circuit-analysis
126
questions
2
votes
0
answers
32
views
Where should I take the measurement from to find the correct attenuation level of a resistive pi attenuator?
I am currently designing a resistive attenuator for an RF project I'm working on. I wanted to have several resistance combinations to obtain various attenuation levels (1-8 dBs). When I calculate the ...
0
votes
0
answers
31
views
Why are my results different from their PSRR scheme?
Even though I followed every step given in the Analog devices website, the results were still different and I don't know why. Can anyone give me a solution?
Here is my result:
But their PSRR ...
- 69
1
vote
1
answer
52
views
Why does the opamp output not swing to vdd or vss in the simulation?
Why does the output of the opamp not rail to VDD or VSS when the positive feedback factor (2/3) is larger than the negative feedback factor (1/2)?
...
- 292
3
votes
2
answers
156
views
Why is my Thevenin voltage result wrong in LTspice?
I want to simulate the Thevenin voltage of the circuit below, where Z2 is the load, in LTspice. Does anyone know what is wrong here? The result is incorrect; the correct Thevenin voltage should be ...
- 698
1
vote
1
answer
66
views
No output in LTspice
I have implemented a simple circuit in LTspice which is as follows:
Now, when I want to view the output in the collector, it displays only one line.
Now let's check it in DC mode:
which is exactly ...
- 145
5
votes
2
answers
290
views
RC coupling or LC coupling
I would like to generate a signal composed of an AC waveform and DC voltage separately, with the AC frequency range being 20 Hz to 20 kHz.
I found there are two ways to achieve it: RC coupling and LC ...
- 141
0
votes
1
answer
40
views
Practical Implementation of A Two Quadrant Transconductance Analogue Multiplier [closed]
Currently cannot simulate a functional Two Quadrant Transconductance Analogue Multiplier.
Understood constraints:
Vx is small (Vx << Vt ~ 25mV)
Vy is greater than VBE(on)(0.6V) (a DC offset ...
- 41
1
vote
0
answers
58
views
How do I understand the reason behind the incorrect result in below LTspice simulation?
Shown below is the LTspice simulation for a full bridge rectifier. The simulation shows 'wrong' result for open load condition (Rload =1 GΩ). Ideally it should be same as other 2 cases.
Why is the ...
- 3,032
0
votes
0
answers
49
views
Questions about eliminating oscillation and noise in a load cell system
I'd like to ask you for your expertise on a challenge I'm facing as part of an electronics project.
A crucial part of this project is the integration of a force sensor, whose variation in resistance (...
0
votes
2
answers
214
views
Issue with LED and capacitor circuit
I have recently downloaded and am familiarising myself with LTspice, and to do so I started with a basic circuit.
I had never used a scope prior to this and thought a capacitor discharging to an LED ...
- 9
5
votes
2
answers
523
views
LTspice: weird behavior of simple RC circuit
I try to model a simple RC circuit with input of 2 A DC and I get an out voltage (Vc) of 2 TV. I am not sure what I am doing wrong.
EDIT:
This is for MacOS
- 235
1
vote
1
answer
102
views
Circuit Simplification of (Series/parallel sources)
The question asks to find $$I_s \space\space and \space\space I_x$$
However, before doing so, I should simplify the circuit. Is my simplification correct?
(I.e. is tripling the value of I_s and ...
- 189
1
vote
2
answers
98
views
LTSpice (Berkeley Spice) Files. WHERE?
I am working on importing spice files into Fusion 360 Electrical. It accepts original spice files. Is this something common, where can I find it, etc. I am used to finding the footprint, symbol, 3d ...
- 343
1
vote
0
answers
62
views
Unable to find Gvd of a buck converter using LTspice
I'm trying to simulate a closed-loop buck converter in LTspice. I'm using ideal components. I started by finding the Gvd of the buck converter (duty to output transfer function). I used the .ac ...
3
votes
4
answers
1k
views
What is the reason for getting 7.8 V as output in between two circuits with two voltage sources?
Since I am beginner to circuit design, I am in progress of understanding different basic circuits behaviour.
I designed the below switching circuit with clear transistor calculation. I am using this ...
- 627