R. F. power amplifier

Details R. F. power amplifier R. F. power amplifier

1986-06-20

1988-05-10

Laroche, Eugene R.

Amplifiers

Modulator-demodulator-type amplifier

330251, 330207A, H03F 338, H03F 3217

Patent

active

047438584

ABSTRACT:
An r.f. power amplifier, typically a high efficiency, class E amplifier in which a reactive load circuit (18) is connected to a semiconductor switching device (10), the load circuit being designed to have the required input load angle and loaded Q so that the voltage across the device (10) goes to zero with zero slope before it switches on and passes current, is provided with a step recovery diode (32) connected to the device (10) to limit the voltage swing across the device (10) with no significant loss of efficiency. This allows the voltage-handling capability required of the device to be reduced or the amplifier output power to be increased by increasing the supply voltage.

REFERENCES:
patent: 3919656 (1975-11-01), Sokal et al.
Sokal, Nathan O., "Class E Can Boost Efficiency", Elec. Design, vol. 20, 9-27-77, pp. 96-102.
Sokal, Nathan O. and Alan D., "Class E-A New Class of Hi-Efficiency Tuned Switching Power Amps", IEEE J., S.S. Circuits, vol. SC-10, No, 3, June 1974, pp. 168-176.

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