In a non-inverting op amp circuit, assume R1 = 130 kΩ. What is the voltage gain of the amplifier, A=V_OUT/V_IN.
R2= 10kΩ
The voltage gain, A, of a non-inverting op amp circuit with R1 = 130 kΩ and R2 = 10 kΩ is given by:
A = 1 + R2/R1
A = 1 + 10/130
A = 1.077
Therefore, the voltage gain of the amplifier is approximately 1.077.
In a inverting amplifier, assume R2 = 80k and the amplitude of the input voltage is 100 mV. Calculate the amplitude of the output voltage in mV. Hint: The Amplitude of the output voltage is the input amplitude times the voltage gain.
The voltage gain (Av) of an inverting amplifier with R2 = 80kΩ is given by:
Av = - R2 / R1
Since this is not given, we can assume a value for R1. For example, if we assume R1 = 20kΩ, the voltage gain would be:
Av = -80kΩ / 20kΩ = -4
This means that the output voltage will be the input voltage multiplied by the voltage gain (Av). So if the input voltage amplitude is 100 mV, the output voltage amplitude will be:
Output voltage amplitude = Input voltage amplitude x Voltage gain
Output voltage amplitude = 100 mV x (-4)
Output voltage amplitude = -400 mV
Therefore, the amplitude of the output voltage in mV is 400 mV with a negative polarity (inverted).
To calculate the voltage gain (A) of a non-inverting op amp circuit, you can use the formula:
A = 1 + (R2/R1)
Given that R1 = 130 kΩ and R2 = 10 kΩ, let's substitute these values into the formula:
A = 1 + (10kΩ / 130kΩ)
Calculating:
A = 1 + 0.0769
A ≈ 1.0769
Therefore, the voltage gain of the amplifier in the non-inverting op amp circuit is approximately 1.0769 (or 107.7% if expressed as a percentage).