Semiconductor Devices: Miller's Theorem 

Here, we define Miller's Theorem and then examine it's effect on the input impedance of a single stage BJT amplifier. The theorem states that if an impedance is placed across an inverting amplifier (i.e., from input to output), it will create an equivalent input shunt impedance equal to the feedback impedance divided by the quantity gain magnitude plus one, and an equivalent output shunt impedance equal to the feedback impedance times the gain magnitude and divided by the quantity gain magnitude plus one. Zin-miller = Z/(|A|+1)and Zout-miller = Z|A|/(|A|+1). Collector feedback is the bias of choice here, with the base feedback resistor being in the Miller position, connecting input and output (base and collector).
References: Semiconductor Devices: Theory and Application; Chapter 6, section 4; and chapter 7.
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