VLSI

Doubling the amount of transistors in every 18 months, is known as

• Gordan’s Law
• More’s Law
• Moor’s Law
• None of these

The n-type region created near the surface by the positive gate bias is called the inversion layer, and this condition is called ___________________.

• Channel inversion
• accumulation
• Surface inversion
• depletion

the surface is said to be ____________ when the density of mobile electrons on the surface becomes equal to the density of holes in the bulk (p-type) substrate.

• (i) accumulated
• (ii) inverted
• both (i) and (ii)
• None of these

the surface is said to be inverted when

• the density of mobile electrons on the surface becomes equal to the density of holes in the bulk (p-type) substrate.
• the density of mobile electrons on the surface becomes greater than to the density of holes in the bulk (p-type) substrate.
• the density of mobile electrons on the surface becomes less than to the density of holes in the bulk (p-type) substrate.
• None of these

The simple operation principle of nMOS device is: control the current conduction between the source and the drain, using the electric field generated by the gate _________ as a control variable.

• current
• power
• voltage
• None of these

the channel current also called the _______ current

• drain
• gate
• substrate
• source

The substrate bias coefficient is __________ in nMOS, ___________ in pMOS.

• negative, positive
• positive, negative
• positive, positive
• negative, negative

the threshold voltage of an enhancement-type n-channel MOSFET is a _________ quantity, whereas the threshold voltage of a p-channel MOSFET is___________.

• positive, negative

• negative, positive

• negative, negative

• positive, positive

The substrate Fermi potential OF is _________ in nMOS, __________ in pMOS.

• positive, negative
• positive, positive
• negative, negative
• negative, positive

for V_DS = V_DSAT, the inversion charge at the drain is reduced to zero, which is called the _____________ point

• Saturation

• Linear

• Cut-off

• pinch-off