All Questions
64
questions
0
votes
0
answers
22
views
How to stimulate PSRR of LT3060-2.5 and LT1761-2.5 in LTspice?
I tried following the steps on the analog devices website but it seems that with these components the results are not close to the datasheet while when I try this method with others it works.
Do you ...
- 69
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
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
4
votes
1
answer
163
views
Design of a BJT Translinear-Based Square-Rooting Circuit
I'm trying to make a simple sqrt circuit to act on an input voltage and provide an output voltage without using log and antilog amplifiers. I'm trying to base my design of the translinear combination ...
- 41
2
votes
0
answers
103
views
What is the point of analysis and biasing calculations when real world performance is going to be much lower in analog circuits? [closed]
I am making a 3-stage audio amplifier as a course project. The first stage is a differential amplifier, the second stage is a common-emitter amplifier, following that there is a passive filter and ...
- 505
0
votes
0
answers
103
views
CML Latch simulation in LTSpice
I am trying to simulate a CML Latch in LTSpice (schematic below), but the simulation results do not seem right. I am using N_50n transistors from BSIM4 model. L = 60n for all transistors, W = 10u for ...
- 1
1
vote
1
answer
90
views
Floating node of amplifier in LTSpice
I have been trying to create an actively loaded degenerated CS amplifier with current mirror in LTSpice and whilst working on other aspects of the amplifier the Vout node decided it was floating. I'm ...
- 21
2
votes
1
answer
287
views
LTspice snubber simulation
I'm attempting to simulate a bi-directional snubber to limit the peak voltage when switching off, as shown in the picture below. The resistance of R2 changes from 1 mΩ to 1 MΩ when a current of 1 kA ...
- 21
1
vote
0
answers
453
views
What is transient frequency response in LTSpice?
In LTSpice there is an analysis tab called the Transient frequency response. I have no clue of how to use it and what it does. Please let me know how to use it.
It's asking for an analyser. Is the ...
- 11
0
votes
2
answers
224
views
Best method to find Zin of a BJT
I am trying to reconcile how to find the Zin of a non-bypassed low frequency (~1 MHz) CE amplifier.
If I google common emitter input impedance I find this (where re = Vt/Ie). Ok, great.
When I ...
- 580
5
votes
5
answers
1k
views
How does a current mirror work?
I'm trying to understand how current mirrors work.
In the text book Microelectronics by Jacob Millman, section 3-11, example 3-8, there is a picture of a current mirror:
They said if we consider \$V_{...
- 53
1
vote
0
answers
145
views
LTspice OTA simulation does not work
I am trying to simulate a balanced OTA with TSMC 350 nm technology in LTspice. Here is the TSMC 350 nm library for LTspice. I designed the balanced OTA topology below:
Thd output current is almost ...
- 393
0
votes
0
answers
42
views
Troubleshooting circuit design for sensor input and desired output range [duplicate]
I designed a circuit to process input from a sensor with a range of -300 mV to 300 mV. The desired output of the circuit is 0 V to 600 mV. To achieve this, I used the op-amp equation Vout = Vin + 0.3 ...
- 87
3
votes
1
answer
769
views
LTspice Monte Carlo Analysis Clarifications required
I am learning about LTspice MC analysis from this site. I understood almost all the things except the below one.
"Then make another spice directive to execute a Monte Carlo run as below
.step ...
- 2,593
4
votes
3
answers
2k
views
LTspice voltage measurement
How do I measure voltage between two nodes when neither of them is ground? In the schematic below, I want to measure the voltage between nodes Vmic and Vx. Is it just (Vmic-Vx)? I'm afraid that gives ...
- 488