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US 5,162,753 AGranted
Amplifier arrangement for use as a line driver
AssigneeAT&T Bell Laboratories
InventorHaideh Khorramabadi
Life of this patent
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Abstract
An amplifier arrangement suitable for use as a line driver is built with a Class AB stage connected in parallel with a Class B stage, whereby the output currents of the stages are summed. Each of the Class AB and the Class B stages has an output current device that is connected in a common-source configuration. In a push-pull configuration of the arrangement, each of a pair of operational amplifiers in the Class AB stage separately drives each of a pair of operational amplifiers in the Class B stage.
Claims6
An amplifier arrangement having an input point (11) and an output point (12) comprising:
- (a) a Class AB amplifier stage having an input operational amplifier (EP1) and an auxiliary output current device that is controlled by the input operational amplifier and that is connected in a common-source configuration, the input operational amplifier having an input terminal connected to the input point;
- (b) an essentially Class B amplifier stage having an output operational amplifier (EP2) and having a main output current device that is controlled by the output operational amplifier, an input terminal of the output operational amplifier being connected to an output terminal of the input operational amplifier;
- and
- (c) means for electrically connecting an output terminal of each of the main and the auxiliary output current devices to the output point of the arrangement.
1 more element
Dependencies are inferred from the claim text.