Apparatus for improving the efficiency of the modulation stage o

Details Apparatus for improving the efficiency of the modulation stage o Apparatus for improving the efficiency of the modulation stage o

1978-11-17

1981-03-17

Ng, Jin F.

Telecommunications

Transmitter

455103, 455114, 332 64, H04B 102

Patent

active

042571227

ABSTRACT:
The efficiency of the transmitter modulator stage of the type in which an anode current I.sub.a of the modulator tube varies as a function of the grid voltage U.sub.g in accordance with the expression I.sub.a =k.multidot.U.sub.g.sup.m, m.apprxeq.=1.5, in which k is a material constant is improved by introducing a deaccentuator into the transmitter circuit. The deaccentuator functions to cause the anode current I.sub.a to vary in accordance with the equation I.sub.a =k[h(U.sub.E).sup.n ].sup.m, where h and n are constants and U.sub.E is the signal applied to the input of the deaccentuator and n=1/m so that I.sub.a =k.multidot.h.sup.m .multidot.U.sub.E is a linear function.

REFERENCES:
patent: 3274381 (1966-09-01), Amano et al.
patent: 3502987 (1970-03-01), Newton
patent: 3518578 (1970-06-01), Oppenheim et al.
patent: 3704425 (1972-11-01), Haigh
patent: 3708752 (1973-01-01), Fein

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