Asymmetrically biased high linearity balanced amplifier
First Claim
1. A microwave power amplifier comprising:
- an input RF port a carrier amplifier having a first input and a first output a peak amplifier having a second input and a second output, said carrier amplifier and said peak amplifier being symmetrically biased;
a coupling device for coupling said first and second inputs of said carrier amplifier and said peak amplifier to said RF input port; and
an output terminal, said first and second outputs coupled to said output terminal.
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Accused Products
Abstract
A microwave amplifier and more particularly to a microwave amplifier configured as a Doherty amplifier. In particular, the amplifier includes a carrier amplifier, a peak amplifier a Lange coupler at the input of the amplifiers and quarter wave amplifier at the output of the amplifiers. In order to improve isolation between the amplifiers to minimize the dependence of each amplifier'"'"'s inter-modulation (IM) performance on the others, matching networks are provided, coupled to the output of the amplifiers. In addition, the microwave power amplifier includes electronic tuning which allows for improved inter-modulation distortion over a wide input power dynamic range, which allows the IM performance of the microwave amplifier to be adjusted for the operating frequency of the amplifier.
116 Citations
22 Claims
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1. A microwave power amplifier comprising:
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an input RF port a carrier amplifier having a first input and a first output a peak amplifier having a second input and a second output, said carrier amplifier and said peak amplifier being symmetrically biased;
a coupling device for coupling said first and second inputs of said carrier amplifier and said peak amplifier to said RF input port; and
an output terminal, said first and second outputs coupled to said output terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 20, 21, 22)
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15. A microwave power amplifier comprising:
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an RF input port;
an RF output port a carrier amplifier having a first input and a first output;
a peak amplifier having a second input and a second output;
a coupling device for coupling said first and second inputs to said RF input part; and
said first and second outputs to said RF output port;
means for adjusting the bias of at least one of said carrier amplifier and peak amplifier such that said peak amplifier and said carrier amplifier are asymmetrically biased.
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18. A microwave power amplifier comprising:
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an input RF port a carrier amplifier having a first input and a first output;
a peak amplifier having a second input and a second output;
a coupling device for coupling said first and second inputs of said carrier amplifier and said peak amplifier to said RF input port;
an output terminal, said first and second outputs coupled to said output terminal; and
means for asymmetrically biasing said carrier amplifier and said peak amplifier.
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Specification