Small-signal resistance of the diode-connected transistor


Response to the following problem:

Figure shows an amplifier utilizing a current mirror Q2: Q3: HereQ1: is a common-source amplifier fed with Vi = VGS +vi , where VGS is the gate-to-source dc bias voltage of Q1: and vi is a small signal to be amplified.

Find the signal component of the output voltage vO and hence the small-signal voltage gain vo/vi .

Also, find the small-signal resistance of the diode-connected transistor Q2: in terms of gm2, and hence the total resistance between the drain of Q1: and ground. What is the voltage gain of the S amplifier Q1: Neglect all ro's

603_an amplifier.jpg

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Electrical Engineering: Small-signal resistance of the diode-connected transistor
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