Combining circuit for Class-E RF power amplifiers

Details Combining circuit for Class-E RF power amplifiers Combining circuit for Class-E RF power amplifiers

1992-09-04

1993-09-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including class d amplifier

330 51, 330196, 330124D, 330207A, 330295, H03F 3217

Patent

active

052472647

ABSTRACT:
A combining circuit for Class-E RF power amplifiers includes a transformer for each power amplifier to be combined, the respective secondaries of the transformers being connected in series to the RF load of the system. Each of the transformers further has a tertiary winding, with one end connected to a first common circuit node, and the other end being connected to a second common circuit node via an inductance. A switchable reactive network is connected to the second common circuit node, and in the event that one of the power amplifiers is removed from the circuit, such as due to failure thereof, the primary terminating impedance of the transformer connected thereto will become a high impedance, and by appropriate switching of the reactive network, in combination with the remaining circuit components, the matching impedance necessary to maintain optimum operation of the remaining power amplifiers is achieved, with a benign VSWR being presented to the remaining power amplifiers.

REFERENCES:
patent: 3406352 (1968-10-01), Gardenghi
patent: 3919656 (1975-11-01), Sokal et al.

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