Lecture 1Cascode

7.2 The Basic Gain Cell7.3 The Cascode Amplifier

Common Source (CS) Amplifier

A CS amplifier with a current source load

Practical Implementation of the CS amplifier

Increased Voltage Gain

A 2-step process (Norton Equivalent Circuit)1. Determine the short circuit output current2. Determine the output resistance

Determine Output Current

Determining the Output Resistance of a Cascode Amplifier

PMOS implementation of a cascode

Use PMOS cascode as a load

Double Cascodeing

A Folded Cascode

Bipolar Junction Transistor

A Common Emitter (CE) Amplifier

A BJT Cascode Amplifier

Determining the output resistance of the BJT Cascode Amplifier

Comparisons

BiCMOS Cascode