Apparatus for biasing a complementary metal-oxide semiconductor differential amplifier
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorNeil E. Wood
Life of this patent
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Abstract
A bias generation circuit for biasing a differential amplifier is disclosed. The bias generation circuit is coupled to the differential amplifier. After determining a common-mode voltage of a pair of differential outputs from the differential amplifier, the bias generation circuit generates a bias voltage, which is proportional to the determined common-mode voltage, to the differential amplifier such that the common-mode input voltage range of the differential amplifier is extended to as far as the rail-to-rail voltage.
Claims6
An apparatus comprising:
- a complementary fold-cascode differential amplifier;
- and
- a bias generation circuit, coupled to said differential amplifier, for determining a common-mode voltage of a pair of differential outputs from said differential amplifier, and generates a bias voltage to said differential amplifier such that the common-mode input voltage range of said differential amplifier is extended to as far as the rail-to-rail voltage.
A bias generation circuit for biasing a differential amplifier, said bias generation circuit comprising:
- means for determining a common-mode voltage between two output signals from said differential amplifier, wherein said differential amplifier is a complementary fold-cascode differential amplifier;
- and
- a current mirror for converting said determined common mode voltage to a bias voltage for said differential amplifier.
Dependencies are inferred from the claim text.