Cascode Amplifier

216

03:40:48

Similar to a voltage-dividing amplifier, except with a 2nd transistor (to reduce the Miller effect).

First, disconnect the AC source to observe the DC conditions. The blue node (~10.7 VDC) is the DC offset of the amplifier — the "average" voltage around which the output wave oscillates.

The two 10-uF capacitors filter input/output noise, while the two 100-uF capacitors maintain a steady voltage on the nodes they're connected.  The green node will then serve as a lower limit for the amplified wave, and the power supply (orange) will be the upper limit.

At ~180 mV on the AC source, the output voltage (blue) will start to clip.

published 11 years ago

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