Download - Cascade Amplifier
Cascade Amplifier
• Multistage amplifier• Improved gain• Reduced bandwidth
Different Types• RC Coupled• Transformer Coupled• Direct coupled
Cascade AmplifierRC coupled amplifier Circuit diagram
Cascade AmplifierDesignGiven that,
Design of second stage:
Cascade Amplifier
• Design (continue…)
Cascade Amplifier
Design (continue..)
Cascade Amplifier
Design (Continue..)
Simulated Results:Designed values-
Standard values used for simulation
Cascade Amplifier
Simulated Results:DC bias conditions:Designed: Simulated:
Cascade Amplifier
Simulated Results:Cascade Amplifier
Simulated Results (Continue..)
Cascade Amplifier
Simulated Results (Continue..)Desired gainObtained gain
Scaling factor
New value of Rc,
Standard value
Cascade Amplifier
Cascade AmplifierSimulated Results (Continue..)
Design of first stage:
Cascade Amplifier
Design (continue..):
(Re design)
Cascade Amplifier
Simulated Results:Designed values:
Standard values used for simulation
Cascade Amplifier
Simulated Results (continue..):DC biased conditions:Designed Simulated
Cascade Amplifier
Cascade AmplifierSimulated Results (continue..):
Simulated Results (continue..):Cascade Amplifier
Simulated Results (Continue..)Desired gain Obtained gain
Scaling factor
Due to low load resistance (Ro1=Rc1 || Rin2) , scale RE1New value of Re,
Standard value
Cascade Amplifier
Simulated Results (Continue..)Cascade Amplifier
Cascade Amplifier
Combine the two stages…
Simulated Results of Two stage RC coupled Amplifier Cascade Amplifier
Cascade Amplifier
Cascade Amplifier
Simulated results:Scale RC and RE for undistorted output wave
and required gain AvScale Coupling capacitors for required lower
cutoff frequency fL
Cascade Amplifier
Thank You