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A FET is called a square-law device because of the relationship of ID to the square of a term containing VGS.
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What is square law device?
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.
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.
What is square law detection?
Square law detection is a method used in communication systems to demodulate analog signals. It relies on multiplying the input signal with itself to obtain the power of the signal, which contains information about the original signal. This method is commonly used in amplitude modulation systems for recovering the original message signal.
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 is square law device?
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.
What device were puritans confined to if they disobeyed the law?
A pillory.
What is copyright of broadcasts called?
In copyright law, broadcast is generally referred to as transmission. From the US law, for example...To 'transmit' a performance or display is to communicate it by any device or process whereby images or sounds are received beyond the place from which they are sent.
What is the law about jobs called?
The body of laws related to employment is commonly referred to as labor law or employment law. These laws govern the rights and obligations of both employers and employees in the workplace.
What is called to aprove a law?
what is called to approve a law
Why was the laser invented?
In 1954, an American scientist named Charles H. Townes designed a device that used Einstein's insight to generate a tightly focused, extremely intense beam of microwaves. Microwaves are a type of electromagnetic wave. Townes called his device a maser. After several years of research, Townes began working with his brother-in-law, Arthur Schawlow, to create a new device. This device would resemble a maser but would achieve the same tightly focused, intense beam with visible light. They called this device a laser.
A law governing taxation is called?
A law governing taxation is called a tax law.
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.
