| Patent application number | Description | Published |
|---|
| 20080226100 | Microphone Amplification Arrangement and Integrated Circuit Therefor - A microphone amplifier arrangement comprises at least one microphone input connected to a dual output microphone pre-amplifier having an input resistance comprising a first resistance and a second resistance in a first voltage-to-voltage mode of operation, and only the second resistance in a second current-to-voltage mode of operation. A first output is operably coupled to a first feedback path comprising a V2V feedback resistor; and a second output is operably coupled to a second feedback path comprising an I2V feedback resistor. In this manner, the microphone amplifier arrangement is arranged to support both a V2V microphone amplifier and a low-noise I2V microphone amplifier. | 09-18-2008 |
| 20080303496 | Low Pass Filter Low Drop-out Voltage Regulator - A low dropout voltage regulator is described having a pass device, differential amplifiers, and a feedback loop including a low pass filter. Two differential amplifiers arranged in parallel coupled to the low pass filter in the feedback loop provide a specified and stable DC voltage whose input-to-output voltage difference is low. Improved stability, reduced die area, improved power supply rejection ratio, increased bandwidth, decreased power consumption, and better electrostatic discharge (ESD) protection may result. | 12-11-2008 |
| 20100029344 | HEADSETS - A detector for detecting the connection of an accessory including a microphone and/or the state of a switch associated with the microphone for a mobile device, wherein the detector comprises a first flag generator for time multiplexing the detection of a signal above a predetermined threshold for each of two comparators, such that for one time period one comparator output is detected and for a second time period the second comparator output is detected to thereby form a first flag; a second flag generator for determining the connection of microphone to thereby generate a second flag; a lookup table for determining the connection of the accessory and/or the state of the microphone switch from the first and second flags. | 02-04-2010 |
| 20100246858 | AMPLIFIER CIRCUIT - An amplifier circuit comprises differential amplification circuitry comprising an input stage having first and second differential inputs, and an output stage, having respective first and second amplifier components with first and second differential outputs. The first amplifier component of the output stage comprises a first power transistor operably coupled to the first differential output and driven by a first differential output of the input stage, and a third power transistor operably coupled to the first differential output of the amplifier circuit and driven by a second output of the input stage. The second amplifier component comprises a second power transistor operably coupled to the second differential output and driven by a second output of the input stage, and a fourth power transistor operably coupled to the second differential output and driven by the first output of the input stage. Each of the first and second power transistors of the first and second amplifier components is driven in a current mirror arrangement by the respective first and second output of the input stage. | 09-30-2010 |
