Telecommunications – Transmitter – Including tuning
Patent
1990-06-15
1992-12-08
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Including tuning
455123, 333 171, 343861, H04B 104
Patent
active
051704960
ABSTRACT:
In a circuit arrangement for matching the resonant frequency of an antenna resonant circuit (18) to the output circuit of a transmitter output stage (10), the antenna resonant circuit (18) is coupled via a reactance to the transmitter output stage (10). By means of a current sensor (16), the supply direct current of the transmitter output stage (10) is detected. The value of a tuning component (26), lying in the antenna resonant circuit (18), can be changed by a control signal; the tuning component is a governing factor for the resonance frequency of the antenna resonant circuit (18). A comparator and control unit (36)repeatedly samples the value of the supply direct current detected by the current sensor (16). In dependence upon the result of a comparison with a sequential previously sampled value, it applies th control signal to the tuning component (26) to obtain a maximization of the supply direct current detected.
REFERENCES:
patent: 3919644 (1975-11-01), Smolka
patent: 4654880 (1987-03-01), Sontag
patent: 4965607 (1990-10-01), Wilkins et al.
S. L. Model and I. CLH. Newjashskij: hochfrequenzsender, VEB Verlag Technik Berlin, 1953, pp. 113-115.
Belzer Christine K.
Donaldson Richard L.
Eisenzopf Reinhard J.
Kesterson James C.
Mapstone Rebecca A.
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