Efficient amplification techniques for non-linear amplifiers

Details Efficient amplification techniques for non-linear amplifiers Efficient amplification techniques for non-linear amplifiers

1995-08-15

1997-06-03

Mottola, Steven

Amplifiers

With pilot frequency control means

455 70, H03F 366

Patent

active

056358709

ABSTRACT:
A method and apparatus is provided for amplifying electronic signals in a linear fashion while maintaining DC power efficiency. In one embodiment, the invention comprises a coupler receiving an input signal and connected to a non-linear amplifier. A tone generator is also connected to the coupler, and generates a tone signal at a selected frequency. The coupler combines the tone signal and an input signal and provides the combined signal to the amplifier. The combined signal is amplified and bandpass filtered to remove spectral by-products. The power of the tone wave generator signal is selected so as to cause the nonlinear amplifier to operate near its saturation point but in a linear region. The effect is to linearize the operation of the nonlinear amplifier, while simultaneously minimizing the presence of intermods and maintaining a relatively high level of DC power efficiency. Various modifications are also disclosed, wherein the amplitude of the tone signal is adjusted according to the power level of the input and/or output signal.

REFERENCES:
patent: 5313657 (1994-05-01), Sakamoto et al.
H. Krauss, C. Bostian and F. Raab, Solid State Radio Engineering (J. Wiley & Sons 1980), pp. 348-371, 394-468, 472-473.
J. Millman, Microelectronics: Digital and Analog Circuits and Systems (McGraw-Hill 1979), pp. 660-673.
J. Pierce and T. Paulus, Applied Electronics (Bell & Howell 1972), pp. 597-624.
Product Specification for SD4010 RF and Microwave Transistor, published by SGS-Thomson Microelectronics (1992).

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