Level-shifting amplifier with gain error reduction
AssigneeNational Cheng Kung University
InventorsJia-Ching Wang, Tai-Haur Kuo
Life of this patent
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Abstract
An amplifier circuit includes an input terminal, configured to receive an input voltage; an output terminal, configured to output an output voltage; a multi-stage operational amplifier, coupled to the input terminal and the output terminal, and configured to amplify the input voltage to the output voltage, comprising a plurality of amplifiers; and a plurality of level-shifting networks, each coupled between two of the plurality of amplifiers, configured to reduce a gain error of each output of the plurality of amplifiers; and a feedback capacitor, coupled between the input terminal and the output terminal.
Claims7
An amplifier circuit, comprising:
- an input terminal, configured to receive an input voltage;
- an output terminal, configured to output an output voltage;
- a multi-stage operational amplifier, coupled to the input terminal and the output terminal, and configured to amplify the input voltage to the output voltage, comprising:
- a plurality of amplifiers;
- and
- a plurality of level-shifting networks, each coupled between two of the plurality of amplifiers, configured to reduce a gain error of each output of the plurality of amplifiers;
- and
- a feedback capacitor, coupled between the input terminal and the output terminal.
An amplifier circuit, comprising:
- an input terminal, configured to receive an input voltage;
- an output terminal, configured to output an output voltage;
- a first-stage operational amplifier, comprising a first input terminal, coupled to the input terminal, and a first output terminal, configured to amplify the input voltage to a first output voltage;
- a first level-shifting network, coupled to the first output terminal, configured to shift a level of the first output voltage to a first level-shifting voltage;
- a second-stage operational amplifier, comprising a second input terminal, coupled to the first level-shifting network, and a second output terminal, configured to amplify the first level-shifting voltage to a second output voltage;
- a second level-shifting network, coupled to the second output terminal, configured to shift a level of the second output voltage to a second level-shifting voltage;
- a third-stage operational amplifier, comprising a third input terminal, coupled to the second level-shifting network, and
- a third output terminal coupled to the output terminal, configured to amplify the second level-shifting voltage to the output voltage;
- a feedback capacitor, coupled between the input terminal and the output terminal.
Dependencies are inferred from the claim text.