Amplifier circuit having an output transistor for driving a complex load
First Claim
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1. An amplifier circuit, comprising:
- an output transistor configured to drive a complex load over a drive frequency range, wherein in a lower part of the range an inductive component of the load dominates, and in an upper part of the range the inductive component does not dominate;
a current mirror circuit portion upstream of the output transistor; and
a shunt path configured to reduce a DC current flowing through the output transistor without substantially affecting an AC current flowing through the output transistor.
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Abstract
An amplifier circuit is disclosed having an output transistor for driving a complex load over a drive frequency range, wherein in the lower part of the range an inductive component of the load dominates and in the upper part the inductive component does not dominate. The amplifier circuit includes a current mirror circuit that is connected upstream of the output transistor and has a shunt path to a second potential, for the purpose of relatively reducing a DC current flowing through the output transistor in comparison with an AC current flowing through the latter.
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Citations
18 Claims
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1. An amplifier circuit, comprising:
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an output transistor configured to drive a complex load over a drive frequency range, wherein in a lower part of the range an inductive component of the load dominates, and in an upper part of the range the inductive component does not dominate; a current mirror circuit portion upstream of the output transistor; and a shunt path configured to reduce a DC current flowing through the output transistor without substantially affecting an AC current flowing through the output transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An amplifier circuit, comprising:
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a first current mirror circuit configured to receive a first current and generate a second, mirrored current in response thereto; a second current mirror circuit configured to receive the second current and generate a third, mirrored current in response thereto; and a current diversion circuit configured to receive an input signal and divert solely a portion of a DC current associated with the input signal, thus reducing the input signal to the first current comprising an AC component and a reduced DC component. - View Dependent Claims (13, 14, 15)
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16. An amplifier circuit, comprising:
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a first current mirror circuit configured to receive a first current and generate a second, mirrored current in response thereto; a second current mirror circuit configured to receive the second current and generate a third, mirrored current in response thereto; and means for diverting a portion of a DC current component from an input signal to form the first current comprising an AC component and a reduced DC component. - View Dependent Claims (17, 18)
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Specification