Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2005-11-15
2008-11-18
Urban, Edward (Department: 2618)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C455S115100, C455S115300, C455S067110, C455S343100, C375S295000, C375S297000, C330S127000, C330S129000, C330S136000, C330S140000, C324S707000
Reexamination Certificate
active
07454179
ABSTRACT:
The present invention is an active RF power detector and decision circuit, which is used to provide a DC signal to circuitry that controls the DC supply voltage to an RF power amplifier. The DC signal is proportional to the amount of RF power detected within specified operating limits. When the RF power detected is above the maximum operating limit, the DC signal is set to its maximum value. When the RF power detected is below the minimum operating limit, the DC signal is set to its minimum value. The active RF power detector and decision circuit does not require an external DC reference voltage. Since the active RF power detector and decision circuit uses active components, the input impedance is high enough to use resistors to couple the RF input signal instead of a lower impedance RF coupler and the response time is faster than a passive envelope detector.
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Chen Junpeng
RF Micro Devices, Inc.
Urban Edward
Withrow & Terranova, P.L.L.C.
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