H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/104
H03G 3/30 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1174299
ABSTRACT OF THE DISCLOSURE A system for detecting an abnormal condition of a high frequency output signal in its power level, comprising: a variable gain power amplifier which receives a high frequency input signal and produces an amplified high frequency output signal; a negative feed- back control loop connected to the power amplifier, for automatically setting the power level of the amplified high frequency output signal to a desired one of a plurality of predetermined power levels, the negative feedback control loop being so arranged as to produce a DC signal which is held to be constant in its magnitude so far as the power level of the high frequency output signal is maintained at its set value whichever one is selected from the plurality of predetermined power levels, the gain of the power amplifier being controlled on the basis of the DC signal; and a comparator which compares the DC signal with a reference signal to judge as to whether the high frequency output signal is abnor- mal or not in its power level.
398598
Gowling Lafleur Henderson Llp
Hitachi Denshi Kabushiki Kaisha
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