Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2006-06-02
2009-08-04
Vo, Nguyen (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S127200
Reexamination Certificate
active
07570931
ABSTRACT:
An RF transmitter (30) includes an RF power amplifier (32) for which the power input bias voltage (40) and signal input bias voltage (80) are controlled within feedback loops. A peak detector (44) generates a lowered-spectrum, peak-tracking signal (34) that follows the largest amplitude peaks of a wide bandwidth communication signal (16) but exhibits a lower bandwidth. This signal (34) is scaled in response to the operation of a drain bias tracking loop (146) then used to control a switching power supply (36) that generates the power input bias voltage. The tracking loop (146) is responsive to out-of-band power detected in a portion of the amplified RF communication signal (16″). A ratio of out-of-band power (128) to in-band power (126) is manipulated in the tracking loop (146) so that the power input bias voltage is modulated in a way that holds the out-of-band power at a desired predetermined level.
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Brombaugh Eric M.
McCallister Ronald Duane
Crestcom, Inc.
Gresham Lowell W.
Jacobsen Charlene R.
Meschkow Jordan M.
Vo Nguyen
LandOfFree
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