Analog Exam 3

What kind of Op Amp circuit is this?

An Inverting Amplifier is a type of operational amplifier circuit that outputs a voltage that is inversely proportional to the input voltage. It inverts the input signal while amplifying it by a defined gain.

What kind of Op Amp circuit is this?

A Non-Inverting Amplifier

What kind of Op Amp circuit is this?

A Unity Gain Amplifier

What kind of Op Amp circuit is this?

A Summing Amplifier

What kind of Op Amp circuit is this?

A Difference Amplifier

What kind of Op Amp circuit is this?

An Inverting Low Pass Filter

What kind of Op Amp circuit is this?

An Inverting High Pass Filter

What kind of Op Amp circuit is this?

Current to Voltage Converter (Transimpedance Amplifier)

What kind of Op Amp circuit is this?

Voltage to Current Converter (Transconductance Amplifier)

Makes a current source

Design Consideration for a Common Emitter Amplifier emitter voltage and why

Choose a Ve value of 1 V, this will give Vout pleny of wiggle room, making the upper limit +Vcc, and the lower limit 1.2 V.

Design Consideration for a Common Emitter Amplifier quiescent current value and why

Choosing an Iq value of 0.5 mA or 1 mA makes Re 2k or 1k, making the math much easier.

Design Consideration for setting the Gain of a Common Emitter Amplifier and why

Only use the value of R3, as Re, Rc, and rTR is already accounted for

What does a Common Emitter Amplifier do?

Used to Amplify Voltage

Gain = -Rc/Re

What must Vin have on a Common Emitter Amplifier

Vin must have a DC Offset

What is the difference between a Push-Pull Follower and a regular Follower?

Same goal, but does not require a DC Offset on Vin

How does a Push-Pull Follower work?

Uses two transistors, one NPN and one PNP. Acts as emitter followers to amplify the signal.

What is a Darlington Pair used for?

Higher current applications (like heating up a 10 ohm resistor)

Chip is a TIP-120

how do you calculate hFE of a Darlington Pair?

(hFE)²

Advantages and Disadvantages of Differential Ground:

Advantage: When there is noise on the signal line, there will most likely also be noise on the ground line, keeping the potential difference constant, not changing the reading.

Disadvantage: Uses twice as many inputs

What is Common Mode Rejection Ratio (CMRR)?

Ratio between the difference of two voltages (G_diff) and the average of the two voltages (G_CM).

The bigger the number for CMRR, the better.

What is Barn-Roof Distortion?

Amplitude distortion in a common emitter amplifier, output waveform is asymmetric, causing positive and negative peaks, resembling a jagged roof. Occurs due to behavior of the transistor and happens when the gain of the amplifier is not constant.

What is Rc chosen to be on a common emitter amplifier

choose a value of Rc that centers Vout at (1/2)Vcc

How many diode drops does a Darlington Pair have?

2

JFET’s are controlled by:

Voltage

Bipolar Transistors are controlled by:

Current

When is a JFET “on”?

A JFET is on when applied voltage equals 0 V (Grounded works as well)

what is Vtail of a differential amplifier equal to?

Vtail = Vcc - 1V

What is the input and output waveform for a Non-Inverting Op Amp setup?

What is the input and output waveform for an Inverting Op Amp setup?

What is Op Amp Golden Rule #1?

With Negative feedback, the op amp does everything it can so that the voltage difference between the 2 inputs equals 0V

What is Op Amp Golden Rule #2?

The current at both inputs equals 0A

What is the input and output waveform for an Inverting Amplifier?

What are Unity Gain Amplifiers used for? (two answers)

They are used for impedance bridging and as a buffer to protect equipment.

What is the equation for Vout of a summing amplifier?

Vout = (-R3/R1)V1 + (-R3/R2)V2 + …

Voltage to Current Converter Equation?

ILoad = Iset = Vset/Rset (Vset = Vcc - V)

Current to Voltage Converter Equation?

Vout = (-Iin)(R)

How would you set up a Darlington Pair?

How would you set up a Push Pull Follower?

What does the waveform look like for a Push Pull Follower?

Which transistor has the highest input impedance?

MOSFETs with an input impedance higher than 10^14 ohms