Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1995-10-04
1997-07-08
Callahan, Timothy P.
Amplifiers
With semiconductor amplifying device
Including gain control means
330285, 327530, 327545, H03G 330
Patent
active
056465777
ABSTRACT:
The SHF output power and channel frequency switching apparatus having an SHF power amplifier for amplifying an SHF signal and supplying the amplified SHF output power signal to a transmitting antenna, an amplification degree control circuit for controlling the amplification degree of the amplifier, an output power change-over switch for switching a plurality of levels of the SHF output power, a channel frequency change-over switch for switching channel frequencies of the output power signal, a memory having stored therein a table of control signals which are selected to have proper values for the respective positions of each of the output power change-over switch and the channel frequency change-over switch in order that a necessary output power level can be produced each time the channel frequency change-over switch is operated to switch, a control signal supply unit for reading from the table the control signals corresponding to the output power and channel frequency specified by the SHF output power change-over switch and the channel frequency change-over switch and for supplying the read control signals to the amplification degree control circuit to control the amplification degree of the SHF power amplifier.
REFERENCES:
patent: 5278517 (1994-01-01), Fujita
patent: 5373251 (1994-12-01), Kunimoto et al.
Callahan Timothy P.
Hitachi Denshi Kabushiki Kaisha
Le Dinh T.
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