8.19 Figure P8.19 shows an amplifier utilizing a current mirror Q2–Q3. Here Q1 is a common-source amplifier fed with v I = 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 voltagevO 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 CS amplifier Q1? Neglect all ro’s.

8.19 - 8.19 Figure P8.19 shows an amplifier utilizing a current mirror Q2–Q3. Here Q1 is a common-source amplifier fed with v I = 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 voltagevO 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 CS amplifier Q1? Neglect all ro’s.

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images - 8.19 Figure P8.19 shows an amplifier utilizing a current mirror Q2–Q3. Here Q1 is a common-source amplifier fed with v I = 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 voltagevO 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 CS amplifier Q1? Neglect all ro’s.

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