Apple Inc.
Apple Inc., Cuptertino, CA US
Patent application number | Description | Published |
---|---|---|
20130072129 | Methods for Determining Optimum Power Supply Voltages for Radio-Frequency Power Amplifier Circuitry - Electronic devices with wireless communications capabilities are provided. The electronic device may include storage and processing circuitry, power amplifier circuitry, power supply circuitry, etc. The storage and processing circuitry may direct the power amplifier circuitry to operate using a desired gain mode, in a particular radio channel, and at a given output power level. The power supply circuitry may bias the power amplifier circuitry with a power supply voltage. The performance of the power amplifier circuitry may be characterized by an adjacent channel leakage ratio (ACLR) margin. The power consumption of the power amplifier circuitry may be characterized by a current savings ratio. A cost function may be calculated by taking the product of the ACLR margin and current savings ratio. A minimum point for each cost function curve may be determined. It is desirable to bias the power amplifier circuitry with a supply voltage corresponding to the minimum point. | 03-21-2013 |
Apple Inc., San Jose, CA US
Patent application number | Description | Published |
---|---|---|
20130119051 | DIRECTED HEATING FOR COMPONENT REWORK - Reworking a component solder attached to a printed circuit board is described. The reworking is accomplished by directing energy only at the solder/pad arrangement used to attach the component to the printed circuit board. In one embodiment, the directed energy takes the form of an alternating magnetic field that inductively couples with the solder/pad arrangement. The alternating magnetic field has a frequency at least 800 kHz. In another embodiment, the directed energy takes the form of a laser beam that is concurrently directed at the solder/pad arrangements for liquefying the solder. | 05-16-2013 |
Apple Inc., Cupterino, CA US
Patent application number | Description | Published |
---|---|---|
20130129135 | MULTIPLE-USE ACOUSTIC PORT - Two or more acoustic transducers share the same acoustic port in a device. The acoustic properties—such as acoustic impedance and frequency response—of the shared acoustic port are matched to each of the two or more acoustic transducers. To accomplish acoustic impedance matching, a separate back volume is provided for each of the acoustic transducers, matched to that transducer. Frequency response matching can be accomplished by the design of the transducer itself, but also by providing an adjacent element in the acoustic system of the transducer. One transducer may serve as an element in the acoustic system of another transducer. Frequency response adjustment of an individual element may also affect acoustic impedance of the entire port-transducer system. | 05-23-2013 |