Tuned RF amplifier
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United States of America Patent
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Aug 11, 1998
Grant Date -
N/A
app pub date -
Jul 12, 1996
filing date -
Jul 12, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tuned radio frequency (RF) amplifier includes serially connected input and output common emitter amplifiers with closed ac and dc loops for maintaining high input impedance and low output impedance. The closed ac loop includes a parallel resonant circuit which is connected to the input and capacitively coupled to the output and across which a small signal appears as the difference between the input and output signals. The collector of the input amplifier transistor is maintained at a constant voltage, thereby minimizing any Miller Effect feedback capacitance, and, therefore, any RF degeneration, at the input.
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