Cascade connection – FET

Posted by AJ × 04:49

• Cascade connection is a series connection with the output of one stage then

applied as input to the second stage.

• Cascade connection provides a multiplication of the gain of each stage for a

larger overall gain.

• Gain of overall cascade amplifier is the product of stage gains AV1 and AV2

Av = Av1AV2 = (-gmRD1) (-gmRD2)

• The input impedance of the cascade amplifier is that of stage 1,

Zi = RG1

• Output impedance is that of stage 2,

Z0=RD2

• The main function of cascading the stages is the larger overall gain achieved.

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