08-16-2017, 09:06 PM
[attachment=6593]
Self cascode :A promising low voltage
Analog design techique
Submitted by-
RAMSHANKAR KUMAR
S7,ECE,
DOE,CUSAT
WHY CASCODE BETTER?
IT IS A SINGLE STAGE AMPLIFIER WITH GAIN ENHANCEMENT.
WHILE A CASCADE IS TWO STAGE AMPLIFIER.
IT HAS SINGLE NODE IS AT HIGHER IMPEDENCE,WHERE GAIN IS REALIZED.
IN THIS GBW IS DETERMINED BY INPUT TRANSCONDUCTANCE AND LOAD CAPACITANCE.
Cascode and cascade amplifier
Cascode amplifier is a one stage amplifier with gain enhancement at low frequencies.
It has one node at higher impedance.
Cascade amplifier is a 2 stage amplifier with 2 nodes at higher impedance which can cause stability problems.
It is eliminated by Miller capacitance across second stage.
Introduction of capacitance increases the power consumption
So, cascode amplifier gives increased performance