Transistor package, amplification circuit including the same, and method of forming transistor
AssigneeNEC Corporation
InventorKazumi Shiikuma
Life of this patent
Estimating the term…
Abstract
A transistor package according to one exemplary embodiment includes main transistors and a sub-transistor placed in the same package as the main transistors and having a smaller size than the main transistors. It is thereby possible to provide a transistor package with more versatility capable of forming various types of Doherty amplification circuits such as a Doherty amplification circuit with auto-biasing function and an extended Doherty amplification circuit with desired operating characteristics, an amplification circuit including the same, and a method of forming a transistor.
Claims9
An amplification circuit including a transistor package, the amplification circuit comprising:
- first and second main transistors;
- a first sub-transistor placed in the same package as the first and second main transistors and having a smaller size than the first and second main transistors;
- a splitter that splits an input signal and generates first and second split signals;
- a first amplifier that is formed at least by the first main transistor and linearly amplifies the first split signal;
- a second amplifier that is formed at least by the second main transistor and non-linearly amplifies the second split signal;
- and
- a combiner that combines output signals of the first and second amplifiers;
- wherein:
- the first main transistor, the second main transistor and the first sub-transistor are field effect transistors, and
- the amplification circuit further includes an auto-biasing circuit that sets an operating point of the first amplifier by detecting a gate voltage of the first sub-transistor that maintains a drain current of the first sub-transistor at a specified value and supplying a first bias voltage corresponding to the detected gate voltage to a gate of the first main transistor.
An amplification circuit including a transistor package, the amplification circuit comprising:
- first and second main transistors;
- a first sub-transistor placed in the same package as the first and second main transistors and having a smaller size than the first and second main transistors;
- a splitter that splits an input signal and generates first and second split signals;
- a first amplifier that is formed at least by the first main transistor and linearly amplifies the first split signal;
- a second amplifier that is formed at least by the second main transistor and non-linearly amplifies the second split signal;
- and
- a combiner that combines output signals of the first and second amplifiers;
- wherein:
- the first main transistor, the second main transistor and the first sub-transistor are bipolar transistors, and
- the amplification circuit further includes an auto-biasing circuit that sets an operating point of the first amplifier by detecting a base current of the first sub-transistor that maintains a collector current of the first sub-transistor at a specified value and supplying a first bias current corresponding to the detected base current to a base of the first main transistor.
An amplification circuit including a transistor package, the amplification circuit comprising:
- first and second main transistors;
- a first sub transistor placed in the same package as the first and second main transistors and having a smaller size than the first and second main transistors;
- a second sub transistor having a smaller size than the first and second main transistors;
- a splitter that splits an input signal and generates first and second split signals;
- a first amplifier that is formed at least by the first main transistor and non-linearly amplifies the second split signal;
- and
- a combiner that combines output signals of the first and second amplifiers
- wherein
- the first main transistor, the second main transistor, the first sub-transistor and the second sub-transistor are field effect transistors, and
- the amplification circuit further includes an auto-biasing circuit that sets an operating point of the first amplifier by detecting a gate voltage of the second sub-transistor that maintains a drain current of the second sub-transistor at a specified value and supplying a first bias voltage corresponding to the detected gate voltage to a gate of the first main transistor, and sets an operating point of the second amplifier by supplying a second bias voltage corresponding to the detected gate voltage to a gate of the second main transistor.
Dependencies are inferred from the claim text.