Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2005-01-04
2005-01-04
Choe, Henry (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S129000
Reexamination Certificate
active
06838938
ABSTRACT:
A communication system comprising a power amplifier coupled to a detector and further coupled to a Bias generator. The detector comprises a controlled amplifier means for generating an output signal (Th_S), the said signal Th_S being indicative for the power of an input signal and having a controllable bias level. The Bias Generator comprises a Level Sensitive Current Generator (LSCG) for generating a current (Cc) controlled by the output signal Th_S. Said LSCG has a threshold level (TL) such that when the output Th_S signal is lower than the TL the current Cc is substantially zero. Otherwise the current Cc is linearly controlled by the signal Th_S. The Bias Generator further comprises an adapter coupled to the LSCG comprising a current controlled adapting means for generating a control signal (C_S) for controlling a property of the amplifier, the control signal C_S having a controllable linear dependency on the current Cc.
REFERENCES:
patent: 6130579 (2000-10-01), Iyer et al.
patent: 6600369 (2003-07-01), Mitzlaff
patent: 6650181 (2003-11-01), Shinjo et al.
patent: 6714071 (2004-03-01), Page
Leenaerts Dominicus Martinus Wilhelmus
Sowlati Tirdad S. H.
Choe Henry
Koninklijke Philips Electronics , N.V.
Ure Michael J.
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