Power amplifier having biasing with selectable bandwidth
First Claim
1. A power amplifier comprising:
- an amplifying transistor having a base for receiving a signal to be amplified; and
a bias circuit configured to bias the amplifying transistor, and including a reference transistor having a base coupled to the base of the amplifying transistor and a collector coupled to a reference current source, the bias circuit further including a coupling circuit that couples the collector and the base of the reference transistor, the coupling circuit including a switchable element configured to allow the coupling circuit to be in a first state to provide a first bandwidth for the bias circuit or a second state to provide a second bandwidth for the bias circuit.
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Abstract
Power amplifier having biasing with selectable bandwidth. In some embodiments, a power amplifier can include an amplifying transistor having a base for receiving a signal to be amplified, and a bias circuit configured to bias the amplifying transistor. The bias circuit can include a reference transistor having a base coupled to the base of the amplifying transistor and a collector coupled to a reference current source. The bias circuit can further include a coupling circuit that couples the collector and the base of the reference transistor. The coupling circuit can include a switchable element configured to allow the coupling circuit to be in a first state to provide a first bandwidth for the bias circuit or a second state to provide a second bandwidth for the bias circuit.
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Citations
20 Claims
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1. A power amplifier comprising:
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an amplifying transistor having a base for receiving a signal to be amplified; and a bias circuit configured to bias the amplifying transistor, and including a reference transistor having a base coupled to the base of the amplifying transistor and a collector coupled to a reference current source, the bias circuit further including a coupling circuit that couples the collector and the base of the reference transistor, the coupling circuit including a switchable element configured to allow the coupling circuit to be in a first state to provide a first bandwidth for the bias circuit or a second state to provide a second bandwidth for the bias circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power amplifier module comprising:
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a packaging substrate configured to receive a plurality of components; and a power amplifier implemented on the packaging substrate and including an amplifying transistor having a base for receiving a signal to be amplified, the power amplifier further including a bias circuit configured to bias the amplifying transistor, the bias circuit including a reference transistor having a base coupled to the base of the amplifying transistor and a collector coupled to a reference current source, the bias circuit further including a coupling circuit that couples the collector and the base of the reference transistor, the coupling circuit including a switchable element configured to allow the coupling circuit to be in a first state to provide a first bandwidth for the bias circuit or a second state to provide a second bandwidth for the bias circuit. - View Dependent Claims (16, 17)
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18. A method for operating a power amplifier, the method comprising:
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providing a signal to be amplified to a base of an amplifying transistor; and biasing the amplifying transistor with a bias circuit having a reference transistor with a base coupled to the base of the amplifying transistor and a collector coupled to a reference current source, the biasing including implementing a first state of a coupling circuit between the collector and the base of the reference transistor to provide a first bandwidth for the bias circuit, or a second state of the coupling circuit to provide a second bandwidth for the bias circuit. - View Dependent Claims (19, 20)
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Specification