Patent attributes
Bias circuit for power amplifier. In some embodiments, a bias circuit for an amplifier can include an input node, an output node, a supply voltage node, and a ground node. The bias circuit can further include a first transistor and a second transistor, with each transistor having a base, a collector, and an emitter. The base, collector and emitter of the second transistor can be coupled to the output node, input node and ground node, respectively. The base and collector of the first transistor can be coupled to the input node and supply voltage node, respectively. The bias circuit can further include a voltage adjustment circuit implemented between the emitter of the first transistor and the output node, and be configured to adjust a voltage at the emitter of the first transistor to a voltage at the output node.
