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US 2019/0173432 A1Published application
Bias circuit
AssigneeNXP B.V.
InventorsMark Pieter Van Der Heijden, Gerben Willem De Jong, Xin Yang
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Abstract
A bias circuit for a bipolar RF amplifier is described. The bias circuit includes a current source coupled to a bias network. The bias network supplies a base current to the transistors in the amplifier circuit of the bipolar RF amplifier. The bias circuit includes a buffer coupled to the bias network and to the bipolar RF amplifier. The buffer provides additional base current to the amplifier circuit of bipolar RF amplifier and sinks avalanche current generated by the amplifier circuit of the bipolar RF amplifier.
Claims20
A bias circuit for an RF bipolar amplifier, the bias circuit comprising:
- a first bias circuit terminal configured to be coupled to the base of a transistor in the RF bipolar amplifier;
- a current source;
- a bias network coupled to the current source and the first bias terminal;
- and
- a buffer amplifier having an input coupled to the current source and an output coupled to the first bias circuit terminal;
- wherein the buffer amplifier is configured to at least partially source current provided to the first bias circuit terminal and to sink current from the first bias circuit terminal;
- and wherein the bias network is configured to provide a current to the first bias circuit terminal.
4 more elements
Dependencies are inferred from the claim text.