Fully differential amplifier device with output-common-mode feedback and control method thereof
AssigneeSTMicroelectronics S.r.I.
InventorsCarlo Caminada, Ernesto Lasalandra
Life of this patent
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Abstract
A fully differential amplifier device includes a first input and a second input, a first output and a second output, and a differential input stage, provided with a first input transistor and a second input transistor. The first input and the first output and the second input and the second output are directly connected selectively in a first operating configuration and disconnected in a second operating configuration. The amplifier device further includes a current-generator circuit connected so as to supply respective first currents to the first and second outputs irrespective of a state of conduction of the first and second input transistors.
Claims18
A fully differential amplifier device comprising:
- a first input, a second input, a first output, and a second output, wherein the first input and the first output are directly connected selectively in a first operating configuration and disconnected in a second operating configuration, and the second input and the second output are directly connected selectively in the first operating configuration and disconnected in the second operating configuration;
- a differential input stage, including a first input transistor and a second input transistor;
- and
- a current-generator circuit connected so as to supply respective first currents to said first and second outputs irrespective of a state of conduction of said first and second input transistors.
A method for controlling a fully differential amplifier device, wherein said amplifier device comprises a first input and a second input, a first output and a second output, and a differential input stage, which includes a first input transistor and a second input transistor;
- the method comprising the steps of:
- directly connecting, in a first operating configuration, said first output to said first input and said second output to said second input;
- disconnecting, in a second operating configuration, said first output from said first input and said second output from said second input;
- and
- continuously supplying currents to said first and second outputs, irrespective of a state of conduction of said first and second input transistors.
A fully differential amplifier device, comprising:
- a first input, a second input, a first output, and a second output, wherein the first input and the first output are selectively connected to one another, and the second input and the second output are selectively connected to one another;
- a differential input stage including a first input transistor and a second input transistor;
- and
- supply means for supplying respective currents to the first and second outputs when the first and second input transistors are turned off.
Dependencies are inferred from the claim text.