Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1999-03-29
2000-10-10
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including gain control means
330133, H03G 310
Patent
active
061305790
ABSTRACT:
Bias circuitry is configured to adjust bias current to one or more power amplifier stages based upon the level of the RF signal to be amplified. A feed-forward circuit senses the input power level of the signal to be amplified and dynamically adjusts the bias current for one or more amplifiers in the amplification path to ensure each amplifier is operating in a linear region for the given signal level. For amplifier configurations having multiple amplification stages, the bias circuitry provides proportional bias currents to each stage as necessary for the progressively increasing signal levels being amplified. The bias circuitry eliminates excessive quiescent bias currents that prior biasing techniques required to ensure linear operation by automatically increasing bias currents only as needed based on the effective magnitude of the RF signal to be amplified.
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Iyer Nathan R.
Kay Michael R
Choe Henry
Pascal Robert
RF Micro Devices, Inc.
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