Class AB Opamp Design

[soc]

65nm opamp

Hello,
I want to design a Class Ab opamp 3 stage with GBW= 2GHz and DC gain 50dB and power supply 1.2/1.5 volts..

Can anyone suggest me any material for fully differential design with example design and analysis of the design with design steps.

Thank you..I hope someone will definetly have something for me.

 

[isaacnewton]

GBW =2 GHz, 3-stage --> very hard. almost not way.

Hello,
I want to design a Class Ab opamp 3 stage with GBW= 2GHz and DC gain 50dB and power supply 1.2/1.5 volts..

Can anyone suggest me any material for fully differential design with example design and analysis of the design with design steps.

Thank you..I hope someone will definetly have something for me.

Added after 1 minutes:

The DC gain is only 50 dB, maybe you don't need 3 stages.

Hello,
I want to design a Class Ab opamp 3 stage with GBW= 2GHz and DC gain 50dB and power supply 1.2/1.5 volts..

Can anyone suggest me any material for fully differential design with example design and analysis of the design with design steps.

Thank you..I hope someone will definetly have something for me.

 

[spbhu]

Impossible to have GBW=2GHz for 3 stage op-amp, you can estimate how large GBW is required for each stage!!!

 

[soc]

The DC gain is only 50 dB, maybe you don't need 3 stages.

With 2 stage so far I have achieved a gain of 42dB but my design is in 65nm so I have to include one more stage as I don't see any other solution..

 

[isaacnewton]

How about increase the bias current?

How much of GBW you got for the two-stage opamp you designed?

The DC gain is only 50 dB, maybe you don't need 3 stages.

With 2 stage so far I have achieved a gain of 42dB but my design is in 65nm so I have to include one more stage as I don't see any other solution..

 

[soc]

How about increase the bias current?

How much of GBW you got for the two-stage opamp you designed?

The DC gain is only 50 dB, maybe you don't need 3 stages.

With 2 stage so far I have achieved a gain of 42dB but my design is in 65nm so I have to include one more stage as I don't see any other solution..

The GBW I got so far is 560Mhz with 1.2V

 

[isaacnewton]

If this GBW is for a 2-stage opamp, then it will be much smaller for a 3-stage opamp.

The GBW I got so far is 560Mhz with 1.2V