Wide-band amplifiers using clipper circuits for reduced harmonics

摘要

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.

主权项

1. A wideband amplifier comprising:
a transistor having first, second and third regions where a signal applied to the third region controls current flow between the first and second regions; a negative waveform clipping element coupled to the third region to shape a peak-to-peak amplitude of the signal applied to the third region and reduce a second harmonic of the signal; and a wideband band pass filter (BPF) or low pass filter (LPF) coupled to an output of the amplifier to reduce harmonic levels.