Amateur Extra pool, section E6C

Amateur Extra Class (2012-2016)

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Subelement E6

CIRCUIT COMPONENTS

Section E6C

Integrated circuits: TTL digital integrated circuits; CMOS digital integrated circuits; gates

E6C01

What is the recommended power supply voltage for TTL series integrated circuits?

A.
12 volts
B.
1.5 volts
Correct Answer
C.
5 volts
D.
13.6 volts

E6C01

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E6C02

What logic state do the inputs of a TTL device assume if they are left open?

Correct Answer
A.
A logic-high state
B.
A logic-low state
C.
The device becomes randomized and will not provide consistent high or low-logic states
D.
Open inputs on a TTL device are ignored

E6C02

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E6C03

Which of the following describes tri-state logic?

Correct Answer
A.
Logic devices with 0, 1, and high impedance output states
B.
Logic devices that utilize ternary math
C.
Low power logic devices designed to operate at 3 volts
D.
Proprietary logic devices manufactured by Tri-State Devices

E6C03

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E6C04

Which of the following is the primary advantage of tri-state logic?

A.
Low power consumption
Correct Answer
B.
Ability to connect many device outputs to a common bus
C.
High speed operation
D.
More efficient arithmetic operations

E6C04

In digital electronics three-state, tri-state, or 3-state logic allows an output port to assume a high impedance state in addition to the 0 and 1 logic levels, effectively removing the output from the circuit.

This allows multiple circuits to share the same output line or lines (such as a bus which cannot listen to more than one device at a time).

http://en.wikipedia.org/wiki/Three-state_logic

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E6C05

Which of the following is an advantage of CMOS logic devices over TTL devices?

A.
Differential output capability
B.
Lower distortion
C.
Immune to damage from static discharge
Correct Answer
D.
Lower power consumption

E6C05

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E6C06

Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

A.
Larger bypass capacitors are used in CMOS circuit design
B.
The input switching threshold is about two times the power supply voltage
Correct Answer
C.
The input switching threshold is about one-half the power supply voltage
D.
Input signals are stronger

E6C06

CMOS (Complementary metal-oxide-semiconductor) is arguably the most common type of digital IC. An advantage of CMOS logic devices over TTL (Transistor-Transistor Logic) devices is that they have lower power consumption. (E6C05) CMOS digital integrated circuits also have high immunity to noise on the input signal or power supply because the input switching threshold is about one-half the power supply voltage. (E6C06)

http://www.kb6nu.com/extra-class-question-of-the-day-digital-integrated-circuits/

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E6C07

In Figure E6-5, what is the schematic symbol for an AND gate?

Correct Answer
A.
1
B.
2
C.
3
D.
4

E6C07

A little help to memorize.

The little circle on the right means NOT.

The AND gate starts with an "A", with a sharp side on the right (the letter as well as the gate).

The OR gate start with a "O", a round side (the letter as well as the gate).

That gives us many of the answers:

AND
NOT AND or NAND
OR
NOT OR or NOR
NOT

I am not sure what 6. is supposed to be. There are apparently 2 inputs and no output....

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E6C08

In Figure E6-5, what is the schematic symbol for a NAND gate?

A.
1
Correct Answer
B.
2
C.
3
D.
4

E6C08

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E6C09

In Figure E6-5, what is the schematic symbol for an OR gate?

A.
2
Correct Answer
B.
3
C.
4
D.
6

E6C09

A little help to memorize.

The little circle on the right means NOT.

The AND gate starts with an "A", with a sharp side on the right (the letter as well as the gate).

The OR gate start with a "O", a round side (the letter as well as the gate).

That gives us many of the answers:

AND
NOT AND or NAND
OR
NOT OR or NOR
NOT

I am not sure what 6. is supposed to be. There are apparently 2 inputs and no output....

Last edited by chevdor. Register to edit

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E6C10

In Figure E6-5, what is the schematic symbol for a NOR gate?

A.
1
B.
2
C.
3
Correct Answer
D.
4

E6C10

test hint nor sounds like 4

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E6C11

In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?

A.
2
B.
4
Correct Answer
C.
5
D.
6

E6C11

1 - AND gate
2 - NAND gate
3 - OR gate
4 - NOR gate
5 - NOT gate
6 - Figure 6 is most similar to an Amplifier

The NOT gate is the only one that has one input and one output. The NOT gate inverses the input.

Study hint: The little dot is an inverter. The NOT triangle doesn't do anything by itself, but the dot inverts it.

One more memory tool: This is the only symbol on here that resembles a knot.

The NOT gate looks kind of like a diode symbol, but it is "NOT" a diode.

See https://en.wikipedia.org/wiki/Logic_gate#Symbols

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E6C12

What is BiCMOS logic?

A.
A logic device with two CMOS circuits per package
B.
An FET logic family based on bimetallic semiconductors
C.
A logic family based on bismuth CMOS devices
Correct Answer
D.
An integrated circuit logic family using both bipolar and CMOS transistors

E6C12

From Wikipedia:

"BiCMOS is an evolved 'semiconductor technology that integrates two formerly separate semiconductor technologies, those of the bipolar junction transistor and the CMOS transistor, in a single integrated circuit device"

Hint: Bi in BiCMOS implies bipolar, which is in the correct answer.

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E6C13

Which of the following is an advantage of BiCMOS logic?

A.
Its simplicity results in much less expensive devices than standard CMOS
B.
It is totally immune to electrostatic damage
Correct Answer
C.
It has the high input impedance of CMOS and the low output impedance of bipolar transistors
D.
All of these choices are correct

E6C13

Just remember BiCMOS combines the qualities of Bipolar transistors and CMOS!

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