WIDE-BAND AMPLIFIERS USING CLIPPER CIRCUITS FOR REDUCED HARMONICS
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Abstract
The present invention breaks up the frequency bands which can be filtered by a simple low-loss band-pass or low pass filter. The second harmonic frequency is reduced by use of a non-linear clipper element which controls the driving waveform symmetry and can reduce the harmonics by as much as 5-15 db which makes the filter much simpler and allows the amplifier to remain wide-band. The output waveform from the amplifier is symmetrical or nearly symmetrical.
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21 Claims
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1. (canceled)
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2. A power amplifier circuit comprising:
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a transistor configured as an amplifier stage of a power amplifier; and a voltage variable clipping element which shapes a peak-to-peak amplitude of a signal applied to the transistor and reduces a second harmonic of the signal, the output of the voltage variable clipping element controlled by a control voltage supplied to the voltage variable clipping element. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An envelope tracking system comprising:
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a power amplifier including a transistor; and a voltage variable clipping element which shapes a peak-to-peak amplitude of a signal applied to the transistor and reduces a second harmonic of the signal, the output of the voltage variable clipping element controlled by a control voltage supplied to the voltage variable clipping element. - View Dependent Claims (19, 20, 21)
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Specification