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US 10,122,334 B2Granted
High efficiency ultra-wideband amplifier
OwnerMohammadhassan Akbarpour, Fadhel M Ghannouchi +1inventors
InventorsMohammadhassan Akbarpour, Fadhel M Ghannouchi, Mohamed Helaoui
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Abstract
An amplifier comprising an active device having an output terminal for driving a load impedance in response to a signal applied to an input terminal and a current source connected to the active device to provide a bias to the active device wherein when the active device is operated an output power of the active device increases with increasing load impedance.
Claims24
A high efficiency ultra-wideband amplifier comprising:
- a first transistor-based amplifier in a main amplifier branch and at least one second transistor-based amplifier in an auxiliary branch;
- a voltage source connected to provide a first bias point for one of the first and second transistor-based amplifiers to achieve first load modulation of said one transistor-based amplifier such that said one transistor based amplifier generates increasing output power in response to decreasing effective load impedance at said one transistor-based amplifier output;
- and
- a current source connected to provide a second bias point for an other of the first and second transistor-based amplifiers to achieve second load modulation of said other transistor based amplifier such that said other transistor-based amplifier generates increasing output power in response to increasing effective impedance at said other transistor-based amplifier output.
1 more element
A push-pull ultra-wideband amplifier comprising:
- first and second transistors of the same transistor type connected in a push-pull configuration;
- a voltage source connected to bias one of the transistors at an output terminal to generate a first current waveform;
- and
- a current source connected to bias the other of the transistors at the output terminal to generate a second current form complementary to the first current waveform to achieve first load modulation by increasing the output power in response to increasing effective impedance at the output terminal, wherein when the active device is operated, an output power of the active device increases with increasing load impedance.
1 more element
An amplifier comprising:
- an active device having an output terminal for driving a load impedance in response to a signal applied to an input terminal a constant voltage source connected to provide a bias point for the active device to generate load modulation behavior by increasing the output power with load resistance decreases;
- a current source connected to provide a first bias point for the active device to achieve first load modulation by increasing the output power in response to increasing effective impedance at the output terminal, wherein when the active device is operated, an output power of the active device increases with increasing load impedance.
Dependencies are inferred from the claim text.