Back to results
US 2018/0294780 A1Published application
Wide-band amplifiers using clipper circuits for reduced harmonics
AssigneeSkyworks Solutions, Inc.
InventorsRobert Bayruns, Tim Gittemeier
Life of this patent
Estimating the term…
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 5-15db 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.
Claims21
(canceled)
A wideband power amplifier circuit comprising:
- a transistor configured as an amplifier stage of a power amplifier;
- and
- a voltage variable clipping element that shapes a peak-to-peak amplitude of a signal applied to the transistor and reduces a second harmonic of the signal, the voltage variable clipping element electrically coupled to the transistor and controlled by a control voltage generated based at least in part on one or more of a temperature, an output power, or a voltage standing wave ratio under mismatch.
An envelope tracking system comprising:
- a power amplifier including a transistor;
- and
- a voltage variable clipping element that shapes a peak-to-peak amplitude of a signal applied to the transistor and reduces a second harmonic of the signal, the voltage variable clipping element electrically coupled to the transistor and controlled by a control voltage generated based at least in part on one or more of a temperature, an output power, or a voltage standing wave ratio under mismatch.
Dependencies are inferred from the claim text.