Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2007-03-20
2007-03-20
Shingleton, Michael B (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S133000, C330S134000, C330S296000, C330S297000, C330S310000, C330S267000, C330S279000, C330S261000, C330S285000
Reexamination Certificate
active
10874590
ABSTRACT:
A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier stage. The power control circuitry provides a variable supply voltage to the input amplifier stages based on an adjustable power control signal. The final amplifier stage is powered by a fixed supply voltage. In operation, as output power of the power amplifier is reduced from its highest power level, the variable supply voltage is reduced. Accordingly, RF power of an amplified signal provided to the final amplifier stage from the input amplifier stages decreases, and the final amplifier stage transitions from saturation to linear operation, thereby increasing the gain of the final amplifier stage. Thus, a desired output level can be maintained while operating at lower current levels.
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Bosley Ryan
Epperson Darrell G.
Gamero Carlos
Gibson Joel R.
LaBelle Michael
RF Micro Devices, Inc.
Shingleton Michael B
Withrow & Terranova , PLLC
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