Differential two-stage miller compensated amplifier system with capacitive level shifting
AssigneeAnalog Devices, Inc.
InventorsDaniel F. Kelly, Lawrence Singer, Steven Decker, Stephen R. Kosic
Life of this patent
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Abstract
A differential two-stage Miller compensated amplifier system with capacitive level shifting includes a first stage differential transconductance amplifier including first and second output nodes and an output common mode voltage, a second stage differential transconductance amplifier including non-inverting and inverting inputs and outputs and an input common mode voltage, and a level shifting capacitor circuit coupled between the first and second output nodes and the non-inverting and inverting inputs for level shifting between the output common mode voltage of the first stage and the input common mode voltage of the second stage.
Claims25
A differential two-stage Miller compensated amplifier system with capacitive level shifting comprising:
- a first stage differential transconductance amplifier including first and second output nodes and an output common mode voltage;
- a second stage differential transconductance amplifier including non-inverting and inverting inputs and outputs and an input common mode voltage;
- a level shifting capacitor circuit coupled between said first and second output nodes and said non-inverting and inverting inputs for level shifting and predetermined voltage charging between said output common mode voltage of said first stage and said input common mode voltage of said second stage, said level shifting capacitor circuit includes:
- a first level shifting capacitor coupled between one of said first and second output nodes and one of said non-inverting and inverting inputs for charging to a first predetermined voltage, and
- a second level shifting capacitor coupled between the other of said first and second output nodes and the other of said non-inverting and inverting inputs for charging to a second predetermined voltage;
- and
- first and second biasing circuits coupled to said first and second level shifting capacitors for charging said first and second level shifting capacitors to said first and second predetermined voltages.
A differential multi-stage amplifier system comprising:
- a first stage differential transconductance amplifier having a first output node and a second output node and having an output common mode voltage;
- a second stage differential transconductance amplifier having a non-inverting input and an inverting input and an inverting output and a non-inverting output and having an input common mode voltage;
- a first level shifting capacitor coupled between said first output node and said non-inverting input;
- a first biasing circuit coupled to the first level shifting capacitor to charge the first level shifting capacitor to a first predetermined voltage;
- a second level shifting capacitor coupled between said second output node and said inverting input;
- a second biasing circuit coupled to the second level shifting capacitor to charge the second level shifting capacitor to a second predetermined voltage;
- and
- wherein said first and second level shifting capacitors level shift between said output common mode voltage and said input common mode voltage.
Dependencies are inferred from the claim text.