How to Derive the Laplace Transfer Function for a Parallel RC Circuit?

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SUMMARY

The discussion focuses on deriving the Laplace transfer function for a parallel RC circuit involving an accelerometer, modeled as a Norton generator in parallel with a capacitor and a load resistor. The transfer function is established as T(s) = ΔvL(s) / ΔiP(s) = R / (1 + sRC), where R is the load resistance and C is the equivalent capacitance. The transient response of the voltage across the load is expressed as vL(t) = iPR(1 - e^(-t/CR)), and the time taken for the voltage to reach steady state is calculated as approximately 41.25 ms for a step change in current of 2 nA.

PREREQUISITES
  • Understanding of Laplace transforms in circuit analysis
  • Knowledge of parallel and series RC circuit configurations
  • Familiarity with Norton and Thevenin equivalent circuits
  • Basic principles of piezoelectric sensors and their electrical modeling
NEXT STEPS
  • Study the derivation of Laplace transforms for parallel RC circuits
  • Learn about the application of Kirchhoff's Current Law (KCL) in circuit analysis
  • Explore the impact of step inputs on the transient response of RC circuits
  • Investigate the behavior of piezoelectric sensors in electrical circuits
USEFUL FOR

Electrical engineers, circuit designers, students studying control systems, and anyone involved in the analysis of dynamic systems using Laplace transforms.

  • #31
Much better.
 
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  • #32
Hello,

I am struggling to see how this was achieved...

acw260 said:
Ip(s) / s = V(s)/R + sCV(s)
therefore
V(s) = Ip(s) / s(sC+1/R)

Could someone point me in the right direction please?

Thanks
 

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