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US 7,804,357 B2Granted
Distributed amplifier
AssigneeFujitsu Limited
InventorHisao Shigematsu
Life of this patent
Estimating the term…
Abstract
In order to allow to make compact a distributed amplifier by dispensing with any choke coil and reduce its cost, the distributed amplifier is configured such that it comprises an input side transmission line, an output side transmission line, and plural amplifier circuits connected to the input side transmission line and the output side transmission line, wherein push-pull amplifier circuits are employed as the amplifier circuits.
Claims16
A distributed amplifier comprising:
- an input side transmission line;
- an output side transmission line;
- plural push-pull amplifier circuits connected to said input side transmission line and said output side transmission line;
- and
- a constant-voltage power source capable of supplying a constant voltage;
- wherein each of said plural push-pull amplifier circuits has a push side transistor that is a field-effect transistor having a source, a drain and a gate and a pull side transistor that is a field-effect transistor having a source, a drain and a gate,
- said input side transmission line is directly connected to the gates of said push side transistor and said pull side transistor,
- said output side transmission line is directly connected to the source of said pull side transistor and to the drain of said push side transistor,
- said constant-voltage power source is directly connected to the drain of said pull side transistor,
- the source of said push side transistor is grounded, and
- wherein the plural push-pull amplifier circuits are not part of the output side transmission line.
8 more elements
A distributed amplifier comprising:
- an input side transmission line;
- an output side transmission line;
- plural push-pull amplifier circuits connected to said input side transmission line and said output side transmission line;
- and
- a constant-voltage power source capable of supplying a constant voltage;
- wherein each of said plural push-pull amplifier circuits has a push side transistor that is a bipolar transistor having an emitter, a collector and a base and a pull side transistor that is a bipolar transistor having an emitter, a collector and a base,
- said input side transmission line is directly connected to the bases of said push side transistor and said pull side transistor,
- said output side transmission line is directly connected to the emitter of said pull side transistor and to the collector of said push side transistor,
- said constant-voltage power source is directly connected to the collector of said pull side transistor,
- the emitter of said push side transistor is grounded, and
- wherein the plural push-pull amplifier circuits are not part of the output side transmission line.
8 more elements
Dependencies are inferred from the claim text.