Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Patent
1987-03-19
1988-10-25
Mullins, James B.
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
330 51, 330 56, 330295, 455 8, H03F 368
Patent
active
047806850
ABSTRACT:
A power combiner includes an input power splitter driving a plurality (N) of amplifiers. The amplifier outputs have Z.sub.0 output impedance and are coupled by transmission (TX) lines of Z.sub.0 characteristic impedance to the junction point of a lossless power combiner. Short-circuiting switches located .lambda./4 from the junction power disconnect failed amplifiers from the combiner. According to the invention, a number M<N of the shorting switches are open during normal operation, so the impedance presented by the parallel TX lines at the junction of the combiner is Z.sub.0 /M. An impedance transformer associated with the combiner transforms the junction point impedance Z.sub.0 /M to Z.sub.0 at the combined output port, for example, by a .lambda./4 line having an impedance .sqroot.Z.sub.o.sup.2 /M. For control purposes, when an amplifier fails, it is disconnected by closing its shorting switch, and the shorting switch of a redundant amplifier is opened, so the impedance at the junction point remains the same.
REFERENCES:
patent: 4285346 (1981-08-01), Armitage
patent: 4315222 (1982-02-01), Saleh
patent: 4641106 (1987-02-01), Belohoubek et al.
patent: 4697160 (1987-09-01), Clark
Moody et al., "Redundancy Switching of Amplifiers in Satellites", RCA Technical Notes, TN No. 1182, Jun. 10, 1977.
Berard Jr. Clement A.
General Electric Company
Meise William H.
Mullins James B.
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