Determine value of the input common-mode resistance


Response to the following problem:

Design a BJT differential amplifier that provides two single-ended outputs (at the collectors). The amplifier is to have a differential gain (to each of the two outputs) of at least 100 V/V, a differential input resistance ≥ 10 kΩ, and a common-mode gain (to each of the two outputs) no greater than 0.1 V/V. Use a 2-mA current source for biasing.

Give the complete circuit with component values and suitable power supplies that allow for ± 2 V swing at each collector. Specify the minimum value that the output resistance of the bias current source must have. If the current source is realized by a simple mirror, what must the minimum value of VA be? The BJTs available have β ≥ 100. What is the value of the input common-mode resistance when the bias source has the lowest acceptable output resistance?

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Electrical Engineering: Determine value of the input common-mode resistance
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