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ATAV 406: Digital Application > Module 2: Flip Flops and Op Amps > Flashcards

Module 2: Flip Flops and Op Amps Flashcards

1
Q

The output of a sequential circuit is determined by what?

A

Inputs given
present state (previous ins/outs)
Memory

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2
Q

What is feedback?

A

Outputs becoming part of the new inputs

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3
Q

Combinational logic circuits use what type of elements?

A

Decision elements

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4
Q

Sequential logic circuits use what type of elements?

A

Memory elements

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5
Q

What are the 2 types of sequential logic circuits?

A

Asynchronous and Synchronous (analyzed differently for valid outputs)

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6
Q

In which operation do the outputs respond to the inputs immediately and eventually reach a stable state?

A

Asynchronous

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7
Q

In synchronous operation when does the output change?

A

Only at specific times determined by an input control signal called a CLOCK/ENABLE

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8
Q

What is the reaction of a synchronous circuit to its control signal?

A

Static or Dynamic

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9
Q

When does static allow the circuit to change state?

A

Whenever it is high (level triggered)

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10
Q

When does dynamic allow the circuit to change state?

A

When control signal itself is changing from one level to the other

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11
Q

In a synchronous system, are the inputs allowed to change while the output is changing state?

A

No

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12
Q

What is the building of sequential logic

A

Storage elements

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13
Q

A bubble on a clock pulse represents what?

A

Negative edge trigger

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14
Q

An ENABLE control signal to flip flop is called what?

A

Latch

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15
Q

An SR with an enable is called?

A

Gated latch

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16
Q

What is a flip flop?

A

A device with 2 stable states, set (1) and reset (0)

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17
Q

What is a latch?

A

The most basic type of flip flop that stores 1 bit of info

18
Q

What are the 4 basic types of flip flops?

A

SR, D, T, JK

19
Q

What is ENABLE?

A

A control signal, static (level) allows circuit to change state

20
Q

What is LATCH?

A

holds memory of last output

21
Q

What is GATED?

A

Synchronous device using an ENABLE input

22
Q

What is TOGGLE?

A

Changes state

23
Q

What is CLOCK?

A

Control signal, dynamic(edge) allows circuit to change state

24
Q

A latch is normally what trigger? What about the fli flop?

A

Latch is level triggered

Flip FLop is edge triggered

25
Q

What are the 2 Asynchronous inputs?

A

Preset and Clear

26
Q

When preset is active what happens?

A

Priority over all, makes output SET

27
Q

When CLEAR is active, what happens?

A

Priority over all, makes output reset

28
Q

Preset and clear are normally high or low?

A

Low (bubble)

29
Q

What are the 3 characteristics of an Op amp?

A

High input impedance
Low output impedance
High voltage gain

30
Q

An op amp configured to output Max voltage is driven into what?

A

Saturation

31
Q

The op amp saturates at ______ of supply Voltage

A

80%

32
Q

What is clipping?

A

When signal is driven beyond saturation

33
Q

What are the 3 basic op amp configurations?

A

Comparator
Inverting
Summing

34
Q

What does a voltage comparator do?

A

Compares inverting and non inverting and produces an output based on which input is more positive

35
Q

What can be used as an input to an op amp which effectively zeroes the output?

A

Offset null

36
Q

How do we get a single polarity output?

A

Ground one of the supply voltages

37
Q

What is the purpose of the negative feedback?

A

Controls the gain of the device, connected from output to inverting lead

38
Q

Gain levels in a closed loop are _______ than open

A

much lower

39
Q

The high input impedance of an op amp prevents what?

A

Current from flowing through the op amp

40
Q

In a voltage summing amp, the V out is the inverted sum of the input Vs when all the resistors are what?

A

The same value

ATAV 406: Digital Application (2 decks)

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