In the figure,given that $V_{BB}$ supply can vary from $0$ to $5.0 \,V$,$V_{CC} = 5\,V$,$\beta_{dc} = 200$,$R_B = 100\,k\Omega$,$R_C = 1\,k\Omega$ and $V_{BE} = 1.0\,V$. The minimum base current and the input voltage at which the transistor will go to saturation,will be respectively:

  • A
    $25\,\mu A$ and $3.5\,V$
  • B
    $20\,\mu A$ and $3.5\,V$
  • C
    $25\,\mu A$ and $2.8\,V$
  • D
    $20\,\mu A$ and $2.8\,V$

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$(1)$ Base,emitter and collector regions should have similar size and doping concentrations.
$(2)$ The base region must be very thin and lightly doped.
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