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Terms in this set (24)
What are the six advantages of MOSFET compared to bipolar transistor?
Mosfets are small and easy to make dense
Mosfets consume less energy
Mosfets operate at higher frequencies
Mosfets reduce heat dissipation
Mosfets have a higher input impedance, which is easier to handle a high current
Mosfets can handle more power and has a very low power loss and a highspeed
What are some advantages of BJT over MOSFET?
Bipolar Transistors have less important losses, reduced thermal noise, zero grid current, easy analysis, can be used as a variable resistor in the communication circuits
What is the difference between BJT and Mosfet transistor
BJT transistor is different because there is always power going on all the time . Being turned on or off when used in a circuit.
Mosfet device is very different, so that almost no current flows when it is off . it can be fully activated or deactivated by a tiny amount of grid voltage
What is Moore's law?
•Every year computation of power doubles, and this doubling leads to exponential growth
- that the number of transistors on a microchip doubles every two years, though the cost of computers is halved.
Why might the semiconductor industry abandon Moore's Law?
engineers are unable to keep pushing the limit on smaller transistors, and thus, computer systems may have reached their limit in transistor capacity and power. Hence, industry leaders are asserting that Moore's Law has come to an end, and computers will no longer have many more transistors every year.
What computing technology is presented as a new paradigm after Moore's law?
Moore's law will come to an end as a consequence of physical limitations of silicon; neuromorphic three dimensional quantum computing is poised to take over as the new paradigm.
How did John McCarthy define AI at the 1956 Dartmouth Conference?
John McCarthy, who coined the term in 1956, defines it as "the science and engineering of making intelligent machines
What are the 5 basic functions performed by one neuron?
- Generate intrinsic membrane activity;
- Receive synaptic inputs in dendrites;
- Combine synaptic inputs with intrinsic membrane activity;
- Generate outputs in the form of action potentials;
- Distribute outputs from axon terminals
Draw an architecture for Analog implementation of neurons and explain its operation
Drawing looks like a lower case h with an extension on the right connecting a triangle > with an arrow right after labelled spike.
top of the h has the synapse, bottom has axon and spike with a ^. on the arch of the h has dendrite with a ground wire.
spikes on the wire labeled 'axon' are integrated by the capacitance of the wire labeled 'dendrite'. The resulting voltage is compared with a threshold using a comparator and a spike is generated when the voltage exceeds threshold.
long term plasticity
Long-term plasticity refers to persistent activity-dependent changes in the synaptic strength. Due to its durability, this form of synaptic plasticity is widely believed to be the reason for learning and memory.
long-term potentiation (LTP)
long term depression (LTD)
- Some patterns of synaptic activity in pre and post-synaptic neurons produce a long-lasting increase in synaptic strength
- long lasting decrease for depression
Spike-timing-dependent plasticity (STDP)
Spike-timing-dependent plasticity (STDP) is an asymmetric form of Hebbian learning which depends on the temporal correlations between pre and post-synaptic spikes.
neurons that fire together wire together
- Hebbian theory is a neuroscientific theory claiming that an increase in synaptic efficacy arises from a presynaptic cell's repeated and persistent stimulation of a postsynaptic cell.
key productivity drivers of semiconductor industry
- Reduction in the US corporate tax:
- Artificial Intelligence:
- Transition to the 10nm node and beyond:
In order for a single electron transistor to operate normally, two quantum conditions must be satisfied in single-electron tunneling. Write an expression representing two quantum conditions and explain their meaning.
deltat = (e^2/2C)
(RTC) > h
n. One is that the capacitor single-electron charging energy e2/2C must exceed the thermal energy kBT arising from the random vibrations of the atoms in the solid, and the other is that the Heisenberg uncertainty principle be satisfied by the product of the capacitor energy e2/2C and the time t=RTC required for charging the capacitor
Draw the external circuit of a single electron transistor.
looks like a Side was E, empty side up. left side and middle has circle Vsd and Vg. middle also has 2 lines Cg. above that has a horizontal oval: quantum dot. Left and right side has 2 lightbulb looking source lead, and drain lead.
Briefly explain the principle of operation of the quantum dot laser
A quantum dot laser is a semiconductor laser that uses quantum dots as the active laser medium in its light emitting region
Draw the schematics of the crossed nanowire FET and explain how it works.
- Draw like: flat board with G, S, D like a cross, g in the middle. S and D on each cross corner.
- The current from the source to the drain is turned on and off by the voltage applied to the gate. Because the gate in nanowires is surrounding the channel, it can control the electrostatics of the channel more efficiently than the conventional MOSFET.
Find the Density of States of the quantum well. 2D
Density of states of the quantum well: g(E)2D= m(*)/pih^2
Find the Density of States of the quantum wire. 1D
(1/hpi) = 1/hpi
Find the Density of States of the quantum dot 0D
Quantum Wells (2D)
- a potential well that confines particles in one dimension, forcing them to occupy a planar region
Quantum Wire (1D)
- an electrically conducting wire, in which quantum transport effects are important
Quantum Dots (0D)
- a semiconductor crystal that confines electrons, holes, or electron-pairs to zero dimensions
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