Mutchus

Depletion MOSFET Depletion MOSFET may be fabricated from the basic MOSFET structure. An n-type channel is obtained by diffusion between N + type source and drain in an n-channel MOSFET. The below figure shows the structure of depletion MOSFET.     n-channel Depletion MOSFET Working of Depletion MOSFET When the gate source voltage is zero considerable drain current flows. When the gate is applied with negative voltage. Positive charges are induced in the n-channel through the Si O 2 layer of the gate capacitor. The conduction in n-channel FET is due to electrons i.e. the majority carriers. Therefore the induced positive charges make the n-channel less conductive. The drain current therefore gets reduced with increase in the gate bias voltage. The distribution of charges in the channel results in depletion of majority carriers. That is why this type of FET is called depletion MOSFET. The voltage drop due to the drain current causes the channel region nearer to the drain more dep...

3.5  BASIC ATOMIC THEORY  REVIEW EXERCISES       1.         What is an atom?                                          2.         State the characteristics of an atom. 3.         How do atoms of different elements differ? 4.         List  ten  elements. 5.         Define the following: Molecule, element and compound. 6.         Deduce electronic configuration and draw the atomic structure of a neutral atom whose atomic number is 14 with 14 neutrons. 7.         What is the principal characteristic ...

3.4 Atomic Structure Definition Key Points 1.         Matter is anything that occupies space and has mass. 2.         The smallest particle of matter that can take part in a chemical reaction is called an atom. 3.         An atom consists of protons, neutrons and electrons. 4.         The protons and neutrons form the nucleus of the atom. 5.         Protons and neutrons are collectively known as nucleons. 6.         The atomic number of an element indicates the number of protons in the nucleus of its atom. 7.         The number of electrons in the outermost orbit is the valence electrons. 8.         Electrons carry a negative charge; while protons carry a positive charge. Charged atoms or molecule are called ion...