Questions tagged [push-pull]

A circuit that uses a pair of active devices (such as complementary transistors) to alternately source current ("push") to or sink current ("pull") from a load.

A circuit that uses a pair of active devices (such as complementary transistors) to alternately source current ("push") to or sink current ("pull") from a load.

263 questions
15
votes
4 answers

What is the basic idea behind the so-called "diamond buffer"?

The idea for this question came about after I wrote an answer to a similar question . This "diamond solution" was something unknown to me. I took a look at Wikipedia page (see the picture below) and it immediately impressed me. (The picture is taken…
Circuit fantasist
  • 22,342
  • 2
  • 28
  • 83
15
votes
2 answers

What is causing the distortion in the negative cycle of this push-pull speaker driver?

I'm trying to build a unity-gain push-pull output stage to drive a small ~8 Ω speaker (measured DC resistance is 7 Ω; I don't have a datasheet for it). This is for use with a single rail battery supply, so for the op-amp I've chosen an LM324. For…
mountainmad
  • 277
  • 2
  • 10
14
votes
4 answers

What does the 100 Ω resistor do in this push-pull amplifier?

The following circuit is from The Art of Electronics , 3rd edition: What I don't understand in the circuit is the role of the 100 Ω resistor. The authors say that it: ... serves to eliminate the “dead zone” as conduction passes from one transistor…
apadana
  • 1,156
  • 2
  • 13
  • 28
14
votes
3 answers

Difference between push-pull and totem-pole

I can't understand/see the difference between a push-pull and a totem-pole output. Push-pull: Totem-pole: Do these circuits have a transistor in the input for something like "double amplification?"
Martino Pistis
  • 365
  • 1
  • 5
  • 12
10
votes
4 answers

Question about push-pull MOSFET driver

simulate this circuit – Schematic created using CircuitLab If I have an op-amp with feedback and enough voltage headroom, do I still need to add the biasing diodes (Q2, Q4)? In the above push-pull circuit, for a very brief moment when the signal…
ElectronSurf
  • 2,681
  • 4
  • 38
  • 89
9
votes
1 answer

Difference between open drain and push-pull modes

The figures show diagrams of line signals: the first in the open-drain + pull up mode, the second push-pull + pull-down. There are several questions: Why does a push pull output have a faster slope than an open drain output? Why would a sawtooth…
1i10
  • 103
  • 1
  • 1
  • 5
9
votes
4 answers

Why would you enable pullup for a GPIO pin in push-pull mode?

In this STM32L486xx HAL User Manual (note: 36 MB!) is an example for GPIO configuration to power an external LED on page 53. The code lines that are confusing me are these two: GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull =…
jusaca
  • 10,325
  • 4
  • 43
  • 66
9
votes
4 answers

What is a push-up/pull-up resistor?

A.S. The question A question on pull up resistors answers only a part of my question as already mentioned in "EDIT" made shortly after this question was asked & answers here (below) are much detailed, in-context & easy to understand. Definitely not…
RinkyPinku
  • 556
  • 5
  • 16
8
votes
3 answers

How can I realistically simulate a push-pull SMPS and design a compensator?

I am currently working on a push-pull SMPS design, but I have never used any simulation software * before. The converter has already been designed at the hardware level. My controller, MOSFETs, gate drivers, bridge rectifiers, transformer…
Nafi Can Ereli
  • 379
  • 1
  • 9
8
votes
5 answers

Class AB crossover distortion diode fix

In the class AB amplifier shown below, we use diodes to make the PNP and NPN conduct equally. How do the diodes make them conduct equally? Is there some intuition I could use to understand this phenomenon?
lub2354
  • 383
  • 2
  • 9
8
votes
4 answers

Op-amp based virtual ground with BJT buffer

I have a line-level audio circuit (2-channel balanced to unbalanced input circuit feeding a stereo volume control IC feeding a 2-channel unbalanced to balanced output circuit) which needs a dual PSU (±12V or ±15V). I have some trouble sourcing parts…
Dan Kadera
  • 89
  • 1
  • 3
8
votes
1 answer

Unkown distortion in low power push-pull amplifier

I'm trying to make a small headphone amplifier, and I started out simple: I'm using a LM358 opamp to drive a push-pull stage with a pair of BD transistors. I started by trying a single channel (only one of the sides of the headphone) so I could…
user2934303
  • 791
  • 9
  • 24
8
votes
2 answers

Use of diodes and resistors in a push-pull amplifier

What is the function of the two resistors (R4 and R5) and two diodes (D1 and D2) in the circuit below?
Hilton Khadka
  • 841
  • 2
  • 14
  • 31
7
votes
1 answer

Ringing due to transformer on mosfet drain-source and gate signals in push-pull converter

I am trying to design a circuit with the following specifications: Topology: Push-Pull Input Voltage (DC): 24 V Output Voltage (DC): 400 V Maximum Output Current: 2.5 A Output Power: 1000 W Operating Frequency: 50 kHz The schematic of the circuit I…
Nafi Can Ereli
  • 379
  • 1
  • 9
7
votes
2 answers

What is the easiest way to reduce quiescent current in a AB power amp?

I'm trying to design an push-pull amplifier for a 4 ohm load, it works with a 48 V source. This is the latest design I did: (Input and output are in those two capacitors and the potentiometers are used to set the output DC point and the push-pull…
user2934303
  • 791
  • 9
  • 24
1
2 3
…
17 18