Multistage differential amplifier with CMFB circuit
AssigneeInfineon Technologies AG
InventorsErcan Ramazan, Richard Gaggl, Frederic Pecourt, Christian Schranz
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Abstract
The invention relates to a multistage differential amplifier having an input stage, at which a differential input voltage is present, a load connected to the input stage, a CMFB circuit and an output stage, at which an amplified differential output voltage is output. In order to improve the stability of a common-mode regulating loop, a current source is provided, which additionally feeds current into the regulating loop and thereby ensures that a control voltage for the load does not fall below a predetermined value.
Claims12
A multistage differential amplifier comprising
- an input stage
- a load connected to the input stage,
- a CMFB circuit;
- an output stages;
- a feedback loop tar setting a common-mode voltage wherein a current source is provided, which additionally feeds current into the feedback loop to prevent the load from being switched off;
- and
- a multistage differential amplifier wherein the number of stages of the differential amplifier is even.
A multistage differential amplifier comprising
- an input stage
- a load connected to the input stage,
- a CMFB circuit;
- an output stage;
- a feedback loop for setting a common-mode voltage wherein a current source is provided, which additionally feeds current into the feedback loop to prevent the load from being switched off;
- and
- a multistage differential amplifier wherein an inverting element is provided in the feedback loop,
- wherein the current source is arranged in parallel with the inverting element.
Dependencies are inferred from the claim text.