Question: A diff-amp is biased with a constant-current source (I_{Q}=0.25 mathrm{~mA}) that has an output resistance of (R_{o}=8 mathrm{M} Omega). The bipolar transistor parameters are (beta=120)

A diff-amp is biased with a constant-current source $I_{Q}=0.25 \mathrm{~mA}$ that has an output resistance of $R_{o}=8 \mathrm{M} \Omega$. The bipolar transistor parameters are $\beta=120$ and $V_{A}=\infty$. Determine

(a) the differential-mode input resistance and

(b) the common-mode input resistance.

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