Numerical- Resistance between collector and ground of transistor amplifier

Q.  What should be the value of resistance between collector and ground (R0) for below drawn schematic of transistor amplifier, comprising h-parameters as hie = 1.1 kΩ, hfe = 50, hre= hoe = 0 with short-circuit capacitors?
- Published on 24 Sep 15
h-parameter


a. 5.2 k
b. 2.3 k
c. 1.1 k
d. Infinity

ANSWER: Infinity

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    Discussion

  • Satyawati   -Posted on 29 Sep 15
    Given data:
    hie = 1.1 kΩ,
    hfe = 50,
    hre= hoe = 0
    Rs = 20 kΩ

    To determine:Resistance between collector and ground (Ro)
    Formula: Ro = 1/ Yo –-----(I) & Y0 = hoe – (hfe hre) /Rs + hie) -----(II)

    From the given diagram, substituting all the given values in formula (II), we obtain,

    Y0 = hoe – (hfe hre) /Rs + hie)
    = 0 – (50 x 0 ) / ( 20 k + 1.1 k)
    = 0 – 0 / 21100
    = 0
    Therefore, substituting the value of admittance (Y0) in formula (I),
    R0 = 1/ Y0
    = 1 / 0
    = ∞
    However, infinite resistance exists between collector & ground.

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