$CATEGORY: $course$/top/Example_Category_EN

// Bias current definition
::Ibias_def::In an op-amp, the input bias current  is defined as:
{
=The average value of the currents entering the two input terminals
~The sum of the currents entering the two input terminals
~The difference in the currents entering the two input terminals
~The average value of the currents leaving the two input terminals
}

// Example using markdown formatting
::Rail2Rail1::[markdown]*Rail-to-rail* amplifiers are amplifiers characterized by:
{
=allowing input or output signals to swing to supply voltage levels
~allowing to work with very high supply voltages
~allowing to use a voltage range for the input signal independent of supply voltage levels
~having an input impedance that increases with the supply voltage
}

// Example of html formatting
::SpecCirc3::[html]On a printed circuit board, the function of guard rings is
{
	~to compensate the bias current I<sub>B</sub>
	=to reduce leakage currents
	~to eliminate noise
	~to galvanically isolate the amplifier
}

// Negative credits for wrong answers
::SpecCirc3a::[html]On a printed circuit board, the function of guard rings is
{
	~%-33.333%to compensate the bias current I<sub>B</sub>
	=to reduce leakage currents
	~%-33.333%to eliminate noise
	~%-33.333%to galvanically isolate the amplifier
}

// Check box question (more than one correct option)
::Noise2::[html]In white noise (tick all that apply)
{
  ~%50%the instantaneous value can be described by a random variable with Gaussian distribution
  ~%50%the power spectral density is constant over the frequency
  ~the maximum amplitude is bounded
}

::AmpInstr::[markdown] Indicate, from the following, which are the characteristics that define the concept of instrumentation amplifier.
{
~%20%It is a difference amplifier
~%20%The input is differential
~%20%The output is single-ended, with reference to another terminal
~%20%Gain is preferably determined by a single resistor, isolated from the input terminals
~%20%The input impedance is high and symmetrical
~The output is single-ended, with reference to ground
~%-20%Entry impedance is high but not symmetrical
~%-20%The gain is infinite
~Gain is preferably determined by a single resistor
~%-20%The gain is determined by two pairs of resistances, with identical relative values
}


// Including an image with html formatting
::DiffAmp1::[html]<img src="https://filedn.eu/lgNjsyizeIRQRQbgTHaAMw4/Images/DifAmpElemental.png" width=300>
<br>
The image presents an elementary circuit for making a difference amplifier. The condition for this amplifier to work properly is:
{
=R2/R1 \= R4/R3
~R1+R2 \= R3+R4
~v<sub>1</sub> \= v<sub>2</sub>
~R1*R2 \= R3*R4
}

// Including an image with markdown formatting
::DiffAmp1a::[markdown]
![DiffAmpCirc](https://filedn.eu/lgNjsyizeIRQRQbgTHaAMw4/Images/DifAmpElemental.png)<br>
The image presents an elementary circuit for making a difference amplifier. The condition for this amplifier to work properly is:
{
=R2/R1 \= R4/R3
~R1+R2 \= R3+R4
~v<sub>1</sub> \= v<sub>2</sub>
~R1\*R2 \= R3\*R4
}