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A square law device is something where either current or voltage depends on the square of the other.
For example, a saturated MOSFET has I proportional to V^2.
A diode's characteristics also has a square but it's not as clean. It's exponential, and through a Taylor series you get linear, square, cubic terms....
Anyway, it's useful because you can use it as a modulator or mixer.
Adding voltages is easy (just use resistors or an op amp) but multiplying is hard. With a square law device like a MOSFET you can do this:
Now if you follow that with a bandpass filter centered on you just get
Amplitude modulation.
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Why FET is called square law device?
A FET is called a square-law device because of the relationship of ID to the square of a term containing VGS.
What is square law diode modulator?
Methods of amplitude modulation can be put in the two categories namely Linear modulation methods and Square law modulation methods. Linear modulation method utilizes the linear region of the current voltage characteristics of the amplifying device that is transistor or electron tube. Square law modulation method utilizes the square law region of some current voltage characteristics of a diode or transistor or electron tube. A large number of linear modulation methods have been devised and have been used to varying degree. These methods are namely linear shunt plate modulation or anode choke modulation, linear series plate modulation, grid bias modulation, cathode modulation, suppressor grid modulation, screen grid modulation, collector modulation. Square law modulation circuits make use of non linear current voltage characteristics of diodes or triodes and are in general suited for use at low voltages. Important square law modulation methods are square law diode modulation and balanced modulator.
Is zener diode a linear device?
Zener diode is not a linear device... it is non-linear one. Since linear devices are those devices which have linear characteristics(V-I CHAR.), or follows the Ohm's law i.e. voltage is directly proportional to current. but in case of Zener diode ohm's law fails down. the V-I char. in both forward biased & reverse biased condition is non-linear. So. Zener diode is non-linear device
What is the current flowing through the first device of a circuit when the first device has a resistance of 12 ohms and the 2nd device has a resistance of 4 ohms circuit voltage is 40 volts.?
You describe a series circuit. This answer is for a series circuit. The total impedance is 16 Ohms, 12 + 4. The current by Ohm's Law (Amps = Volts / Ohms) is 40 / 16, or 2.5 Amps. Kirchoff's Current Law says that the current at every point in a series circuit is the same, so the current flowing into the 1st device, the 12 Ohm resistor, is 2.5 Amps.
In a series circuit each device that is added to the circuit decreases the what?
Depends on the device. If it is a resistor and you have a fixed voltage then the circuit will obey Ohms law. Voltage = Current x Resistance. So if R increases by adding more resistors in series and the voltage is constant, the current will decrease.
Why FET is called square law device?
A FET is called a square-law device because of the relationship of ID to the square of a term containing VGS.
What is square law detection?
In electronic signal processing, a square law detector is a device that produces an output proportional to the square of some input.
A helpful device for predicting the ratios of possible genotypes is a?
the Punnett square
What device is used to layout perpendicular lines?
Mechanical device is a try square
Is a helpful device for predicting the proportions of possible genotypes?
A Punnett Square is a helpful device for predicting the proportions of possible genotypes
What is the no texting while driving law called?
Wireless Communications Device Law
What law states that the brightness of a star vaies inversely as the square of the distance from the stars?
The law is called The Inverse Square Law .
What device were puritans confined to if they disobeyed the law?
A pillory.
Helpful device for predicting the probabilities of possible genotypes?
A Punnett Square
What is the helpful device for predicting the proportions of possible genotypes?
the Punnett square
What is the inverse square law for electric force?
The law is that the attraction between electric charges is inversely proportional to the square of the distance. Note that the way the force varies with distance is identical to the gravitational force, which also follows an inverse-square law.
What is square law diode modulator?
Methods of amplitude modulation can be put in the two categories namely Linear modulation methods and Square law modulation methods. Linear modulation method utilizes the linear region of the current voltage characteristics of the amplifying device that is transistor or electron tube. Square law modulation method utilizes the square law region of some current voltage characteristics of a diode or transistor or electron tube. A large number of linear modulation methods have been devised and have been used to varying degree. These methods are namely linear shunt plate modulation or anode choke modulation, linear series plate modulation, grid bias modulation, cathode modulation, suppressor grid modulation, screen grid modulation, collector modulation. Square law modulation circuits make use of non linear current voltage characteristics of diodes or triodes and are in general suited for use at low voltages. Important square law modulation methods are square law diode modulation and balanced modulator.
