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How to compute feedback top resistor in Python using UliEngineering

You can easily compute the feedback top resistor value for an op-amp circuit using the UliEngineering Python library:

feedback_top_resistor.py
from UliEngineering.Electronics.VoltageDivider import feedback_top_resistor
from UliEngineering.EngineerIO import *

# Compute feedback top resistor for gain of 2 with 10k bottom resistor
rtop = feedback_top_resistor(2.0, "10k")
print(f"Feedback top resistor (gain 2, 10k bottom): {format_value(rtop, 'Ω')}")

# Compute feedback top resistor for gain of 5 with 10k bottom resistor
rtop = feedback_top_resistor(5.0, "10k")
print(f"Feedback top resistor (gain 5, 10k bottom): {format_value(rtop, 'Ω')}")

# Compute feedback top resistor for gain of 10 with 10k bottom resistor
rtop = feedback_top_resistor(10.0, "10k")
print(f"Feedback top resistor (gain 10, 10k bottom): {format_value(rtop, 'Ω')}")

Example output

feedback_top_resistor_output.txt
Feedback top resistor (gain 2, 10k bottom): 10.0 kΩ
Feedback top resistor (gain 5, 10k bottom): 40.0 kΩ
Feedback top resistor (gain 10, 10k bottom): 90.0 kΩ

The feedback top resistor calculation determines the required feedback resistor value for an inverting or non-inverting amplifier configuration to achieve a desired gain. This is essential for op-amp circuit design, signal conditioning, and analog signal processing. The gain is the ratio of output voltage to input voltage.

The feedback top resistor is computed using the formula: $R_{top} = R_{bottom} \times (A - 1)$, where $A$ is the desired gain and $R_{bottom}$ is the known bottom (or input) resistor value. For non-inverting amplifiers, this relationship ensures the output voltage is the input voltage multiplied by the gain factor.

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