For E-MESFET, the Zp.u./Zp.d. ratio is 10/1. For MESFET with Lp.u.=Lp.d., Wp.u./Wp.d. is equal to 1/10.
12. In direct coupled logic, the input transistor base is connected to
A. base output
B. emitter output
C. collector output
D. ground
Answer: C
In directly coupled logic, the input transistor base is directly connected to the collector output without any base resistors.
13. Direct-coupled logic is easy to design.
A. true
B. false
Answer: A
Direct-coupled logic devices have fewer components, are economical, and are simpler to design and fabricate.
14. For cascade inverters, the relation suitable is
A. Vin = Vout > Vinv
B. Vin = Vout = Vinv
C. Vin < Vout > Vinv
D. Vin > Vout = Vinv
Answer: B
For cascade inverters without degradation of levels, the relation suitable and required is Vin = Vout = Vinv.
15. MESFET circuits are formed on _____ layers.
A. two
B. three
C. four
D. five
Answer: A
MESFET circuits are formed effectively on two layers – the green implant layer and the red gate-metal layer.
16. 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.
17. 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.
18. 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.
19. 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.
20. _______ 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.
