Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [power-output-stage]

21 questions
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6 answers

Difficulties with Class B Amplifier Biasing

Here I am referring to class B output power amplifier. This circuit should be easy to build and understand but I'm having problems with biasing since I don't really know how to bias the bases of Q1 and Q2, so that Q1 would conduct only positive…
Keno
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Voltage at the Drain Terminal of a Switching MOSFET

I am attempting to drive an STP55NF06 N-Channel MOSFET with a TC4427 gate driver, switching at ~100kHz. The desired outcome is a higher current PWM square wave at the MOSFET's drain (Circuit in Figure 1). However, my actual implementation of the…
SctKwl
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Design of class AB output stage

I'm trying to design an audio amplifier output stage to drive a speaker load. I'd like to start with the design of this stage in order to calculate the input impedance to the output stage so that I can proceed to designing a buffer stage with an…
Blargian
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Amplifier for modulated 2kHz rectangular signal

I want to amplify a rectangular signal coming from a microcontroller. It goes from -3.3V to 3.3V and has frequency of 2kHz. It is modulated with a trapezoid signal, which means the modulating signal rises up linearly to +/- 3.3V, stays at +/- 3.3V…
DOtr
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Output Stage Clipping

I'm playing around with the circuit below (it's a very slimmed down version of Figure 11.10 from High Power Audio Amplifier Construction Manual pg 348) Can anyone explain what it is in the circuit that is causing the positive swing clipping at ~ 3V…
Cdevelop
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Ferrite bead isolation for FPGA core voltage

Why is the ferrite bead isolation not recommended for any FPGA core voltages. When we usually refer any FPGA schematics the voltages output from regulators are directly connect to FPGA without any series isolation between regulator output and FPGA…
Shifali
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Cross coupled Class AB output stage

A simple question about ClassAB common source amplifier. There are two circuits which I have attached with this question, the one on the left is a standard cross coupled circuit which I have taken from CMOS Analog Circuit design by Allen &…
RAN
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Increasing output current of the inverting voltage doubler charge pump circuit, implemented with MAX1720

I have a +3.3V voltage rail available. And I want to generate a pair of negative and positive symmetrical supplies out of it. The magnitude of the output voltages must be less than 7V and should be higher than 5V; anything around 6V is fine. These…
hkBattousai
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Push-pull output stage doesn't reach input voltage

I tried to simulate a push-pull output stage in this configuration: Here with the closed switch: As you can see, the output voltage is very low. I expected 3.3 V and 250 mA at the output. Shouldn't the output be 3.3 V? Am I missing something…
Dario.Casciato
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S-Parameters Power amplifier impedance matching

I recently decided to conceive a 10W class 446MHz amplifier. I want to be able to amplify a 100mW signal into a 10W, for that i'm going for a two stages amplifier : SKY65162 to amplify the signal to 1W Then a 2SK3075 to reach 10W approx. Datasheets…
Wireless Learning
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Demultiplexer 1 to 4 - high specification

I'm working on a power stage (LED driver) that could manage 4 different LEDs color string. Each string is composed by 6 LEDs in serie. See the image to have a better idea: The schematic is composed by different components, and I can not consider…
LucaMon
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600V DC Switch method question

I am making a linear PSU capable of O/P 600v @ 300mA. This is for vacuum tube experiments. I need to connect/disconnect the load from the PSU using a switch. I will not turn OFF the PSU itself. I cannot figure out how to switch 600V. My search did…
Ashok Das
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on/off pin problems with the LM2678 5.0

PCB: My name is Ertuğrul. I made a regulation board with an LM2678 but I have a problem: I provide 12V input but I can not get 5V output. I only get 5V with the on/off pin enabled, but the datasheet says that I can get a 5V output with the on/off…
Ertugrul Sahin
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Collector Current in Class A Output Stage

The goal of this question I am having trouble with is finding the minimum output voltage, in which there are two cases: one in which Q1 turns off, and the second in which Q2 turns goes into saturation. I cannot seem to figure out how to find Q2…
ModularMan
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Push pull output stage max output voltage

Spent a day trying to understand the maximum and minimum output voltage of the basic circuits as shown in this figure The problem is that I have come across different expressions for the output voltage for these circuits. My analysis: Comparing only…
RAN
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