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US 2010/0141338 A1Published application
Broadband power amplifier
AssigneeWiPAM, Inc.
InventorDaekyu Yu
Life of this patent
Estimating the term…
Abstract
A broadband power amplifier is embodied by realizing a substantially two-section output matching circuit or a substantially two-section input matching circuit using a quarter wave transformer itself as the input matching circuit or the output matching circuit. The broadband power amplifier is advantageous in view of integration and miniaturization due to the low characteristic impedance of the quarter wave transformer and enables both reduction of sizes of chips and circuits due to its simple circuit structure and reduction in cost due to the reduced number of passive devices.
Claims20
A broadband power amplifier comprising:
- a first amplifier and a second amplifier that are connected in parallel;
- a first quarter wave transformer connected to an output terminal of the first amplifier to perform an output matching function by controlling a load line impedance of the first amplifier;
- a second quarter wave transformer connected to an output terminal of the second amplifier to perform an output matching function by controlling a load line impedance of the second amplifier;
- and
- an output matching circuit connected to rear ends of the first quarter wave transformer and the second quarter wave transformer.
2 more elements
A broadband power amplifier comprising:
- a first amplifier and a second amplifier that are connected in parallel;
- a first impedance control line connected in series to an output terminal of the first amplifier;
- a second impedance control line connected in series to an output terminal of the second amplifier;
- an output line connecting in parallel output sides of the first impedance control line and the second impedance control line;
- an output matching circuit located on the output line to match a load impedance to Rout//Rout′
- (
- where
-
-
- R
- out
- //
- R
- out
- ′
- =
- R
- out
- ×
- R
- out
- ′
- R
- out
- +
- R
- out
- ′
- )
- ,
- wherein Rout denotes an output impedance of the first impedance control line, and Rout′ denotes an output impedance of the second impedance control line;
- a first quarter wave transformer whose characteristic impedance Ro satisfies the condition of Ropt<Ro<Rout or Ropt>Ro>Rout is located on the first impedance control line to match the output impedance Rout of the first impedance control line to Ropt, wherein Ropt denotes an optimum power source impedance of the first amplifier;
- and
- a second quarter wave transformer whose characteristic impedance Ro′ satisfies the condition of Ropt′<Ro′<Rout′ or Ropt′>Ro′>Rout′ is located on the second impedance control line to match the output impedance Rout′ of the second impedance line to Ropt′, wherein Ropt′ denotes an optimum power source impedance of the second amplifier.
31 more elements
A broadband power amplifier comprising:
- a first amplifier and a second amplifier that are connected in parallel;
- a first quarter wave transformer connected to an input terminal of the first amplifier to perform an input matching function by controlling an input impedance of the first amplifier;
- a second quarter wave transformer connected to an input terminal of the second amplifier to perform an input matching function by controlling a load line impedance of the first amplifier;
- and
- an input matching circuit connected to front ends of the first quarter wave transformer and the second quarter wave transformer.
2 more elements
A broadband power amplifier comprising:
- a first amplifier and a second amplifier connected in parallel;
- a first impedance control line connected in series to an input terminal of the first amplifier;
- a second impedance control line connected in series to an input terminal of the second amplifier;
- an input line connecting in parallel input sides of the first impedance control line and the second impedance control line;
- an input matching circuit located on the input line to match an input impedance to Rin//Rin′
- (
- where
-
-
- R
- in
- //
- R
- in
- ′
- =
- R
- in
- ×
- R
- in
- ′
- R
- in
- +
- R
- in
- ′
- )
- ,
- wherein Rin′ denotes an input impedance of the second impedance control line, and Rin denotes an input impedance of the first impedance control line;
- a first quarter wave transformer whose characteristic impedance Ro satisfies the condition of Rin<Ri<Rin—opt or Rin>Ri>Rin—opt is located on the first impedance control line to match the input impedance Rin of the first impedance control line to Rin—opt, wherein Rin—opt denotes an optimum input impedance of the first amplifier;
- and
- a second quarter wave transformer whose characteristic impedance Ri′ satisfies the condition of Rin′<Ri′<Rin—opt′ or Rin′>Ri′>Rin—opt′ is located on the second impedance control line to match the input impedance Rin′ of the second impedance line to Rin—opt′, wherein Rin—opt′ denotes an optimum input impedance of the second amplifier.
31 more elements
Dependencies are inferred from the claim text.