High efficiency amplifier
OwnerKenichi Horiguchi, Masatoshi Nakayama +1inventors
InventorsKenichi Horiguchi, Masatoshi Nakayama, Tadashi Takagi
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Abstract
A high efficiency amplifier has an analog predistortion circuit (5) connected between an input side dividing circuit (2) and a quarter-wave line (6). This offers an advantage of being able to improve the linearity of the entire amplifier because the nonlinear distortion of a peak amplifier (7) is compensated.
Claims13
A high efficiency amplifier including input signal dividing means for splitting an input signal;
- a first amplifier for amplifying a first input signal fed from said input signal dividing means;
- a second amplifier for amplifying, when power of a second input signal fed from said input signal dividing means is greater than specified power, the second input signal;
- and a combining circuit for combining an output signal of said first amplifier and an output signal of said second amplifier, said high efficiency amplifier comprising before said second amplifier:
- a distortion compensation circuit for compensating for nonlinear distortion of said second amplifier.
A high efficiency amplifier including input signal dividing means for splitting an input signal;
- a first amplifier for amplifying a first input signal fed from said input signal dividing means;
- a second amplifier for amplifying, when power of a second input signal fed from said input signal dividing means is greater than specified power, the second input signal;
- and a combining circuit for combining an output signal of said first amplifier and an output signal of said second amplifier, said high efficiency amplifier comprising before said first amplifier:
- a level limiting circuit for limiting, when amplitude of the first input signal fed from said input signal dividing means is greater than a specified level, the amplitude of the first input signal to less than the specified level, and for supplying to said first amplifier.
A high efficiency amplifier including input signal dividing means for splitting an input signal;
- a first amplifier for amplifying a first input signal fed from said input signal dividing means;
- a second amplifier for amplifying a second input signal fed from said input signal dividing means;
- and a combining circuit for combining an output signal of said first amplifier and an output signal of said second amplifier, said high efficiency amplifier comprising:
- a first waveform shaping circuit before said first amplifier, said first waveform shaping circuit limiting, when amplitude of the first input signal fed from said input signal dividing means is greater than a specified level, the amplitude of the first input signal to less than a specified level, and supplying to said first amplifier;
- and a second waveform shaping circuit before said second amplifier, said second waveform shaping circuit suppressing output of a signal when amplitude of the second input signal fed from said input signal dividing means is less than a specified level.
Dependencies are inferred from the claim text.