Questions tagged [active-components]

Components which provide a gain in the circuit where they are applied. Typical examples are transistors and op-amps.

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1answer
100 views

Is there a standard component that can “save” a certain current or voltage and what is it's name?

What I am thinking about is something like this analog equivalent of a flipflop: ...
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4answers
150 views

How does an active device work as an oscillator when its output is fed back to the input?

In the book The Art of Electronics by Paul Horowitz and Winfield Hill, it is mentioned that "Device with power gain are distinguishable by their ability to make oscillators, by feeding some output ...
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1answer
326 views

How can a USB cable extender boost the signal without an external power source?

I've been searching online for a USB Cable extender for a rather long distance (let's say 10 meters). I'm familiar with the notion that the longer the cable, the weaker the signal might get, more ...
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1answer
55 views

Z-parameters measurement in active circuits

What difficulty faced in measuring Z parameters in active circuits, how is it taken care of?,what is limitation at high frequency? I heard that we use inductor instead of open ckt and capacitor ...
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2answers
966 views

Detecting Specific PWM Signal Without Programming (Only Electronics Components)

I want to detect a specific PWM signal by electronic circuit components i.e. transistors, opamps, capacitors. update: I want to build simple ID system. I want to detect specific PWM signal for example ...
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2answers
138 views

Why can't passive components transform energy from one form to another [closed]

In parts of electrical components active components can control the flow of current in a circuit but passive components cannot. What is the factor that gives active components the ability to control ...
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1answer
51 views

Other active component principles of operation

Besides valves and transistors... On another question, someone talked about magnetic amplifiers, but they are slow. Are there any other kind of "would-be" transistors out there ? A transistor that ...
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2answers
2k views

Advantages of depletion mode FET devices over enhancement MOSFETs

I've grown the impression that JFETs and depletion mode MOSFETs are not used very much nowadays, especially in new designs. I know that they need different bias networks, especially as discrete ...
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1answer
226 views

OP AMP as active negative resistors

Was reading about OP AMP and saw a article on "Active Negative Resistor" on wikipedia @ http://en.wikipedia.org/wiki/Negative_resistance. Question to the gurus: How practical is this? Can I build a ...
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1answer
196 views

What to expect when i place a diode in magnetic field

I am designing a PCB that senses basic NTC values and converts it into digital format. The problem is the entire PCB is above a magnet(about 70mT at the board) that is moving. Hence i want to know ...
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2answers
2k views

How can I tell if a given MOSFET can be fully driven by 5V TTL high signal? (what should I look for on the datasheet?)

How can I tell (by reading the datasheet) if a specific MOSFET can be turned fully on (with the minimum drop) with simply 5V on the gate? (assuming 5V or 12V potential between the drain and source). ...
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2answers
348 views

Can electronic components work without power?

Can electronic components work without power,with the help of temperature? according to my knowledge,I don't think so,until heat will generate some energy and that will drive component. I have to make ...
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2answers
1k views

Which is actually an active component? [duplicate]

"An active device or component is something which can provide an infinite energy or non-zero power for an infinite interval" I learned this definition for an active device in a book, which is valid ...
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1answer
43k views

What is the transfer function for a first order active high-pass filter

What is the transfer function for the below circuit? simulate this circuit – Schematic created using CircuitLab Since the op-amp has unity gain, the transfer function should be the same as a ...
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1answer
482 views

Differential amplifier with active load Sedra Smith

I'm studing differential amplifiers on Sedra Smith book, and I have come across the following circuit. My question is: how can NMOS transistor \$Q_2\$ have a current \$g_{m2}\cdot v_{id}/2\$ if the ...
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1answer
2k views

Power switch between two sources using mosfets

A new problem I have is to create an automatic switch between two sources, only one of the sources should be active at a time. There is a "backup" source (5V battery), as well as another source. Once ...
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10answers
36k views

Why is Vbe a constant 0.7 for a transistor in the active region?

I'm going to take an example of a simple common emitter amplifier. Forget about biasing and things for now, but focus on the crux of this circuit. As how I understand it, a voltage between the base ...
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5answers
177k views

Differentiation between passive and active components

While I (most of the time) know from experience what components are generally considered active or passive, I have yet to come across a satisfying definition. Why do we divide electrical components ...