Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2005-06-03
2008-08-12
Urban, Edward (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S180300, C455S183100, C375S294000, C375S327000
Reexamination Certificate
active
07412215
ABSTRACT:
A system and method are provided for switching from one phase-locked loop feedback source to another in a radio frequency (RF) transmitter. The RF transmitter includes a phase-locked loop (PLL) that provides a phase-modulated RF input signal and power amplifier circuitry that amplifies the RF input signal to provide an RF output signal. The PLL includes switching circuitry that couples a feedback path of the PLL to an output of the PLL for open loop operation and couples the feedback path of the PLL to an output of the power amplifier circuitry for closed loop operation. Prior to switching the feedback path from the output of the PLL to the output of the power amplifier circuitry, time alignment circuitry operates to time-align feedback signals from the outputs of the PLL and the power amplifier circuitry such that switching from open loop operation to closed loop operation causes minimal phase disturbance.
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Hietala Alexander Wayne
Humphreys Scott Robert
Ortiz Jeffery Peter
Chow Charles
RF Micro Devices, Inc.
Urban Edward
Withrow & Terranova , PLLC
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