Qualcomm Atheros Inc.

Qualcomm Incorporated

William W Si

David J Weber

Paul J Husted

William John McFarland

Shahram Abdollahi-Alibeik

Xiaoru Zhang

MeeLan Lee

Chao Lu

Meelan Lee

Methods and apparatuses to adjust isolation between I/O ports. An apparatus includes a die, a first input or output (I/O) port, a second I/O port, and a third I/O port. The second I/O port is between the first I/O port and the third I/O port. A variable capacitor is electrically connected to the second I/O port and is configurable to adjust isolation between the first I/O port and the third I/O port. A method includes performing, by a die, a first RF function via a first I/O port; tuning a variable capacitor electrically connected to a second I/O port to adjust isolation between the first I/O port and a third I/O port, the second I/O port being between the first I/O port and the third I/O port; and performing, by the die, a second RF function via a third I/O port.

Isolation among I/O ports

A modulation system comprising a signal processing unit and a modulator. The signal processing unit may generate a low frequency modulator signal, a high frequency modulator signal, and a modulator amplitude control signal. The modulator may generate a modulated signal for transmission via a wireless network based, at least in part, on the low frequency modulator signal, the high frequency modulator signal, and the modulator amplitude control signal. The signal processing unit comprises a delay compensation unit for delaying the generation of the high frequency modulator signal and the modulator amplitude control signal based, at least in part, on signal generation and modulation path delays associated with the low frequency modulator signal to substantially align the modulator signals at the output of the modulation system.

Polar modulator with path delay compensation

A dual mode power amplifier can include a linear gain section and a non-linear gain section configured together as a polar amplifier. The dual mode power amplifier may be used to transmit GFSK, 4-DPSK, and 8-DPSK modulated data. In one mode, both non-linear and linear gain sections may be used to transmit 4-DPSK and 8-DPSK modulated data. Alternatively, in another mode, the linear gain section may be bypassed while the non-linear gain section may be used to transmit GFSK modulated data. By selecting the operating mode, the dual mode power amplifier may be advantageously configured to use relatively less power while supporting GFSK, 4-DPSK, and 8-DPSK modulation schemes.

Dual mode power amplifier

A polar transmitter includes a phase monitoring unit for monitoring input modulating data. When a phase transition exceeds a phase transition threshold, the phase monitor unit can signal an amplitude negation unit to invert the amplitude data coupled to the polar amplifier. The phase monitoring unit can also add an offset to the phase data that is provided to a frequency synthesizer. In another embodiment, when the phase transition threshold is exceeded, the phase monitoring unit can trigger inverting differential frequency data coupled to the polar amplifier. In one embodiment, the phase offset and the amplitude negation are applied until a second phase transition value exceeding the phase transition threshold is detected. If such an event is detected, then the input amplitude data is no longer inverted and the phase offset value is no longer added to the modulating data.

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San Jose, CA, United States of America

William W Si