Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Patent
1998-04-02
2000-10-17
Pascal, Robert
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
330295, H03F 368
Patent
active
061337889
ABSTRACT:
Two amplifiers that are driven using outphasing modulation are coupled to one another so that the amplifiers affect each other's effective load line. The two amplifiers can maintain efficiency over a wider dynamic range than in a conventional amplifier. Amplifiers according to the invention amplify an AC input signal of varying amplitude and varying phase using a DC power supply. A converter converts the AC input signal into a first signal having constant amplitude and a first phase angle and into a second signal having constant amplitude and a second phase angle. The first amplifier amplifies the first signal, and the second amplifier amplifies the second signal. A coupler couples the first and second amplifiers to one another and to a load impedance, such that voltages or currents in the first amplifier become linearly related to voltages or currents in the second amplifier. The coupler may include at least one transformer that serially couples the first and second amplifiers to one another and to the load impedance. The coupler may also include first and second quarter wave transmission lines that couple the first and second amplifiers to one another and to the load impedance. The amplifiers preferably use bilateral devices, such that current flows from the first and second amplifiers to the DC power supply during part of a signal cycle, and thereby returns energy to the DC power supply.
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Choe Henry
Ericsson Inc.
Pascal Robert
LandOfFree
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