Hughes Placement: Sample Questions 13 - 14 of 19

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Question 13

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What is Quality factor?

Explanation

  • The quality factor (Q) of resonant circuit is a measure of the “goodness” or quality of a resonant circuit. Quality factor is the ratio of power stored to power dissipated in the circuit reactance and resistance, respectively.

Q =

Q = 2π/R and Q = 1/2π R

  • In a series resonant circuit voltage across L or C is Q time՚s total applied voltage and in parallel resonant circuit current across L or C is Q times the total applied current.

= QV in series resonant circuit

= QI in parallel resonant circuit

Question 14

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What is the difference between IIR and FIR?

Explanation

  • FIR stands for Finite Impulse Response and IIR stands for Infinite Impulse Response.
  • FIR filters are non-recursive and they do not require any feedback in response, whereas in case of IIR filters they require feedback from output so, they are recursive filters.
  • FIR filters always have linear phase response while IIR filters have non-linear phase response.
  • FIR filters are always stable while IIR filters can be stable sometimes.
  • FIR filters requires less power due to lesser number of components while IIR filters require more power due to more coefficients in the design.
  • FIR filters are used for anti-aliasing; baseband and low pass filter design, whereas IIR filters are used as notch (band stop) and band pass filter design.

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