ET1 Flashcards
What is the input impedance for a non-inverting operational amplifier?
The value in the table.
What is the input impedance for an inverting operational amplifier?
The resistor into the inverting input.
Which symbol on an operational amplifier represents the inverting input?
Symbol: -
Which symbol on an operational amplifier represents the non-inverting input?
Symbol: +
To set up a non-inverting amplifier what does the inverting input have to connected to?
To ground. [0V]
To set up an inverting amplifier what does the inverting input have to connected to?
Vin
What is an application of transition gates?
Provide edge triggering.
To set up an inverting amplifier what does the non-inverting input have to connected to?
To ground. [0V]
What does TTL stand for?
Transistor-Transistor Logic
What does CMOS stand for?
Complementary Metal Oxide Semiconductors
In CMOS what range of Vcc can be used?
3V to 18V
In TTL what range of Vcc can be used?
5V +/- 0.25V
What is the upper threshold for a logic level 0 in TTL?
0.8V
What is the lower threshold for a logic level 1 in TTL?
2V
What is the upper threshold for a logic level 0 in CMOS?
0.3Vcc
What is the lower threshold for a logic level 1 in CMOS?
0.7Vcc
What is the simplified version of the Boolean expression A.(A+B)?
A.(A+B) = A.A + A.B = A + A.B = A.(1+B) = A
What is the simplified version of the Boolean expression (A+B).(A+C)?
(A+B).(A+C) = A.A + A.C + A.B + B.C = A + A.C + A.B + B.C
= A + A.(B+C) + B.C = A.(1 + (B+C)) + B.C = A + B.C
According to De Morgan’s theorem what is NOT A OR NOT B equivalent to?
A NAND B
What is A AND NOT A equivalent to?
0
What is A.1 equivalent to?
A
What is A.0 equivalent to?
0
What is A OR NOT A equivalent to?
1
What is A + 1 equivalent to?
1
What is A + 0 equivalent to?
A
What is A + A.B equivalent to?
A + A.B = A.(B+1) = A
What is an alternative method to Boolean algebra for simplifying a Boolean expression?
Karnaugh Maps
What is the rate of transmission of a multiplexer also known as?
The baud rate.
In what form does a multiplexer receive data?
Parallel from.
In what form does a multiplexer transmit data?
Serial form.
For a multiplexer with 2^n data inputs how many input select lines are there?
n select lines.
Explain how a multiplexer can be reconfigured to perform a different logic function.
By altering the connections between the D inputs and the power rails.
Why is a resistor needed with a switch?
To prevent short-circuit of power rails.
What is 45 in binary?
101101
What is 45 in binary coded decimal (BCD)?
0100 0101
To make a BCD counter from a 4-bit binary counter what number in binary must it reset on?
1010 [10 in decimal]
For a rising-edge triggered D-Type Flip Flop what happens when NOT Q when NOT R is taken to logic level 0?
NOT Q is at logic level 1.
How many pulses does the 2 Hz clock produce in 60 seconds?
120
To draw a voltage transfer characteristic for an operational amplifier what needs to be on each of the axis?
x-axis: Vin (V)
y-axis: Vout (V)
When drawing a frequency response for an operational amplifier, what goes on each axis?
x-axis: Frequency (Hz)
y-axis: Voltage gain
When drawing a frequency response for an operational amplifier, the gain holds for a while and then slopes down. What point must this slope pass through?
x-coordinate: Bandwidth
y-coordinate: 0.7*gain
How can an input be held at logic level 1 until a switch is closed?
Use a pull-up resistor.
What does the circle ( o ) on the reset connection indicate?
Reset why R is at logic level 0. [active low]
When producing either an up or down counter using d-type flip flops what must NOT Q output go to?
The D input of the same flip flop.
For a down counter made out of d-type flip flops what does the input to the clock of the next IC have to be from?
The Q output of the flip flop.
For a down counter made out of d-type flip flops what does the LED output have be connected to?
The Q output of the flip flop.
