Wide-band amplifiers using clipper circuits for reduced harmonics
First Claim
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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.
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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.
12 Citations
20 Claims
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1. A wideband amplifier comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
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10. A wideband amplifier comprising:
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a transistor having first, second and third terminals where a signal applied to the third terminal controls current flow between the first and second terminals; a negative waveform clipping element coupled to the third terminal to shape a peak-to-peak amplitude of the signal applied to the third terminal and to reduce a second harmonic of the signal; and a wideband band pass filter (WBF) or a low pass filter (LPF) coupled to an output of the amplifier to reduce harmonic levels. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 20)
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Specification