Multi-Stage Amplifier
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorRichard Hellberg
Life of this patent
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Abstract
The disclosed multi-stage amplifier (200) comprises several amplifier stages (201-203) which, together with an output network, form different branches. A first branch comprises a first and a second amplifier (201, 202) having their outputs connected to each other via a quarter-wave transmission line. The first branch is connected to a load via a first offset-transmission-line (0.1). A second branch comprises a third amplifier stage (203) and a second offset-transmission line (0.22) which are also connected to the load.
Claims19
-10. (canceled)
A multi-stage amplifier structure, comprising:
- a first branch connected to an output node, said first branch including two transistor amplifiers, wherein the outputs of the two transistor amplifiers are connected to one another with a quarter wavelength transmission line or circuit equivalent of a quarter wavelength transmission line;
- and
- a second branch including at least one further transistor amplifier, the output of which is connected to said output node, said second branch including a partial wavelength transmission line, or circuit equivalent of said partial wavelength transmission line, connected between the output of the further transistor amplifier and the output node;
- wherein the multi-stage amplifier structure is configured such that Chireix action takes place between at least one of said transistor amplifiers in the first branch and the at least one further transistor amplifier in the second branch.
A multi-stage amplifier structure, comprising:
- a first branch connected to an output node, said first branch including at least two transistors, wherein the two transistors are connected to one another with a quarter wavelength transmission line or circuit equivalent of a quarter wavelength transmission line;
- and
- a second branch including at least one transistor connected to said output node, said second branch including a partial wavelength transmission line, or circuit equivalent of said partial wavelength transmission line, connected between the transistor and the output node;
- wherein the multi-stage amplifier structure is configured such that Chireix action takes place between at least one transistor in the first branch and at least one transistor in the second branch.
Dependencies are inferred from the claim text.