Questions tagged [amplifier]
An amplifier can be used to adapt the range of a signal to a requirement, to make it more robust for transmission, or to satisfy interface requirements (like input/output impedance).
5,180 questions
4
votes
4
answers
726
views
Why is amplifier bandwidth defined at −3 dB?
Why is the voltage amplification factor of an amplifier or a filter generally expressed by its gain in decibels, and why is the bandwidth of this amplifier defined at −3 dB?
- 43
1
vote
1
answer
106
views
Pull-pull and push-push amplifiers
I know about push-pull amplifier stage, but recently I came to know additional configurations like push-push and pull-pull stages, from a question I was solving.
But couldn't find any sources about ...
- 113
1
vote
1
answer
76
views
Simplest Way to Pre-Charge Capacitors in a High-Impedance Amplifier
My project includes a PIR sensor. The sensor should start reliably detecting motion within 8 seconds after power-up. The amplifiers in PIR circuits have high gain thus large resistors, causing a long ...
- 875
5
votes
3
answers
158
views
Understanding an unusual combination of crossover diodes in a class AB amplifier
Another user had a question about distortion in an audio amplifier. The culprit seemed to be oscillations around Q2-Q4. Here it is again for reference:
Not having a lot of experience with class AB ...
- 14.9k
0
votes
1
answer
64
views
Differential amplifier common-mode gain
How do you find the common-mode gain of this circuit. Lambda > 0, and gmro >> 1. Using Av=-GmRout
0
votes
1
answer
96
views
Thermocouple analog amplifier
I designed a circuit to amplify a thermocouple voltage. It is intended to have hot junction hotter than cold junction. ie, voltage is positive.
Edit: The system is powered by a 2S lithium battery. ...
- 639
0
votes
0
answers
68
views
What are these ICs with the markings 'STIS062', '2EVC', 'C41', etc? [closed]
Please help me figure out what ICs have the markings as pictured:
STIS062
2EVC
C41
AT6A
H43B
- 375
0
votes
1
answer
36
views
Converting transducer echo signal to logic 3.3V signal
Hello — recently I have been working on an ultrasonic transducer project. The transducer simply works by transmitting pulses while the receiver waits for the echo. When there is water flow in a pipe, ...
- 53
2
votes
2
answers
245
views
JFET amplifier clipping on positive peaks after increasing VCC from 9 V to 24 V — lost headroom on top of sine wave
I’m having trouble with a small JFET amplifier stage after raising the supply voltage from 9 VDC to 24 VDC.
The circuit originally worked fine at 9 V, producing a clean sine wave. With 24 V, the top ...
- 31
0
votes
0
answers
42
views
How to simulate IRS2092 in Proteus or PSpice?
I’m currently working on a Class-D amplifier project, but I really can’t find a simulation model for the IRS2092.
If anyone has a Proteus or PSpice file/model, could you please share it with me?
If ...
- 1
1
vote
2
answers
178
views
Can I drive a Helmholtz coil with an audio amplifier?
For my personal project, I want to drive a Helmholtz coil of 8 ohms with 100Hz signal.
My current setup looks like this:
Function Generator (FY3200S series DDS Function Signal Generator)
Audio ...
- 21
4
votes
3
answers
662
views
Why is a DC bias voltage (V_BB) needed in a BJT amplifier, and how does the coupling capacitor make this possible?
Source: "Electronic Devices", Floyd, 10th Edition, Fig. 4-21, p. 180
I’m learning about transistor amplifiers and I want to make sure I properly understand the role of the bias voltage and ...
- 59
0
votes
3
answers
124
views
2-amp fuse burned; how high can and should be the amp rating?
At the beginning of the positive line of a step-down converter with “AZ34063UP” IC (input: 12-24VDC; output: 5VDC, 750mA. There are 3 electrolytic capacitors in this circuit, 2 33uF on the input side, ...
- 75
1
vote
3
answers
165
views
Eliminating 60Hz pickup
I have built a small PCB of the following circuit. The PCB has a ground plane under the top layer. The amplifiers are MAX44260 with the rails at 3.3V and 0V. The input pulse is 3.3V so the peak of ...
- 11
0
votes
0
answers
72
views
Folded cascode large signal properties
I've been reading Ravazi's book Design Of Analog CMOS Integrated Circuits.
regarding the end of chapter 3 (Single-Stage Amplifiers), the book presents the folded cascode (Page 90)
regarding this ...
- 39