MESFET circuits are formed effectively on two layers – the green implant layer and the red gate-metal layer.
2. If the gate-metal layer is in contact with the implant layer _____ is formed.
A. diode
B. transistor
C. switch
D. buffer
Answer: B
If the gate-metal layer is in contact with the implant layer a transistor is formed. The implanted layer and the gate-metal layer interact to form the Schottky gate where they cross one another.
3. When an insulating layer is used in between the implant and gate metal, it is used as
A. amplifier
B. transistor
C. switch
D. interconnect
Answer: D
If an insulating layer is introduced in between the implant and gate metal, there is no interaction between these layers and it can be used as interconnect.
4. The MESFET properties can be varied by varying the
A. implant
B. implant concentration
C. structure
D. length
Answer: B
The basic properties of MESFET can be modified by varying the implant concentration density.
5. Complexity in MESFET design can be reduced by using
A. layout design
B. stick diagram
C. symbolic representation
D. transistor diagram
Answer: C
Through color encoding and symbolic representation of layers, it is possible to remove much of the complexity associated with the design of MESFET.
6. _______ color is used to represent interconnections.
A. red
B. green
C. yellow
D. brown
Answer: A
Red (gate-metal) is used to represent the Schottky gate and short interconnections.
7. Which color is used to represent first-level metal?
A. brown
B. blue
C. dark blue
D. green
Answer: B
Blue (metal 1) is used to represent first-level metal and dark blue (metal 2) is used for second-level metal.
8. The _______ mask identifies all active regions.
A. blue layer
B. red layer
C. yellow layer
D. green layer
Answer: D
The green layer mask identifies all active regions such as areas that eventually form E and D type devices, active loads, and implant resistors.
9. ______ forms the more heavily doped channel of D-MESFET.
A. red inside yellow layer
B. green inside yellow layer
C. yellow inside green layer
D. green outside yellow layer
Answer: B
The green region inside the yellow layer mask forms the more heavily doped channel of the D-MESFET.
10. _______ is used to represent the lightly doped channel of E-MESFET.
A. red inside yellow layer
B. green inside yellow layer
C. yellow inside green layer
D. green outside yellow layer
Answer: D
Green regions outside the yellow layer from the lightly doped channel of the E type MESFET.
