Inverting Amplifier: Calculate Peak Voltages & Currents

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Discussion Overview

The discussion revolves around calculating peak voltages and currents in an inverting amplifier circuit, specifically focusing on the formulas and methods to derive these values. Participants are addressing a homework problem related to circuit analysis.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant states that the input voltage (Vin) is equal to the peak-to-peak voltage (Vin(pp)) divided by 2, seeking confirmation on this formula.
  • Another participant clarifies that "pp" refers to peak-to-peak voltage.
  • The original poster proposes a formula for output voltage (Vout(pp)) as Vout(pp) = -(Rf / R1) Vin(pp) and seeks validation.
  • There is a question about using the voltage divider rule to find the peak voltages across resistors R1 and Rf, with proposed formulas for VR1 and VRf based on the voltage divider concept.
  • Participants discuss the currents through R1 and Rf, with formulas provided for each based on the input and output voltages.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correctness of the formulas presented, and there is uncertainty regarding the application of the voltage divider rule and the calculation of peak voltages.

Contextual Notes

The discussion includes assumptions about the definitions of peak and peak-to-peak voltages, and the validity of the formulas may depend on specific circuit conditions not fully detailed in the posts.

Who May Find This Useful

Students and individuals studying circuit analysis, particularly those working with inverting amplifiers and related calculations.

naspek
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Hey there.. this is my lab discussion.. which i'll attend it this coming monday..
however.. there are questions that I'm not sure the formula to calculate it..
i really hope u guys can varified or corrected my formula.. =)


Homework Statement


Vin(pp) = 1.0V

is it Vin = Vin(pp) / 2 ?

Vout(pp) = -(Rf / R1) Vin(pp)

What are the peak voltages across R1 and Rf?

Calculate the peak currents of R1 and Rf

Homework Equations



Current through R1 = Vin(pp)/R1

Current through Rf = Vout(pp)/Rf

to find peak voltage, can i use voltage divider rule?

VR1 = 10k/43k x Vin
VRf = 33k/43k x Vin


:smile:
 

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pp means peak-to-peak
 
so.. my Vin = Vin(pp) / 2?
 
naspek said:
so.. my Vin = Vin(pp) / 2?

If Vin is the peak voltage, yes.
 

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