Amplifier circuit and integrated circuit therefor
AssigneeFreescale Semiconductor, Inc.
InventorsGerhard Trauth, Ludovic Oddoart
Life of this patent
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Abstract
An amplifier circuit on a single die comprises a low voltage amplifier with a first common mode voltage and having an input and an output. A power amplifier has a second common mode voltage whose input is operably coupled to an output of the low voltage amplifier. The first common mode voltage and second common mode voltage are unequal. A compensation circuit is operably coupled to an input of the power amplifier and arranged to inject a DC-current or apply a common mode voltage into the power amplifier that is representative of a difference between the first common mode voltage and the second common mode voltage.
Claims20
An amplifier circuit on a single die comprising:
- a low voltage amplifier with a first common mode voltage and having an input and an output;
- a power amplifier with a second common mode voltage whose input is operably coupled to the output of the low voltage amplifier wherein the first common mode voltage and the second common mode voltage are unequal;
- and
- a compensation circuit operably coupled to the input of the power amplifier and arranged to inject a DC-current or apply a common mode voltage into the power amplifier that is representative of a difference between the first common mode voltage and the second common mode voltage.
An integrated circuit comprising:
- an amplifier circuit on a single die having a low voltage amplifier with a first common mode voltage and having an input and an output;
- a power amplifier with a second common mode voltage whose input is operably coupled to the output of the low voltage amplifier wherein the first common mode voltage and the second common mode voltage are unequal;
- and
- a compensation circuit operably coupled to the input of the power amplifier and arranged to inject a DC-current or apply a common mode voltage into the power amplifier that is representative of a difference between the first common mode voltage and the second common mode voltage.
Dependencies are inferred from the claim text.