Maxim Integrated Products, Inc.

Qualcomm Incorporated

Apple Inc.

Nvidia Corporation

Rajesh Anantharaman

Ajay Taparia

Guozhong Shen

Ozan Ersan Erdogan

Syed Mahmud

Behrooz Javid

Daniel Ray Bloom

Rahim F Chowdhury

Eugene Antony Whang

Jared Mitchell Kole

Christopher S Erickson

Edwin J Corona Aparicio

Manoj K Bhattacharyya

Edward Siahaan

Esge Brandt Andersen

Onur I Ilkorur

Phillip Qian

Dustin A Hatfield

Sneha Kadetotad

Miikka Olavi Tikander

Yuta Kuboyama

Ashfaq Shaikh

Tian Shi Li

Robert D Zupke

Ting-Sheng Ku

Tsu-Hui Lin

Audrey L Sheng

Jacob E Mattingley

Shunxi Wang

Axit H Patel

Alex C Hellwig

Oliver M Hewitt

This disclosure includes several different features suitable for use in circumaural and supra-aural headphones designs. Designs that include earpad assemblies that improve acoustic isolation are discussed. User convenience features that include automatically detecting the orientation of the headphones on a user's head are also discussed. Various power-saving features, design features, sensor configurations and user comfort features are also discussed.

Headphones with increased back volume

Headphones with magnetic sensor

Aspects of the disclosure are directed to self-capacitance measurement and cancellation. In accordance with one aspect, a self-capacitance cancellation circuit includes an input amplifier, wherein the input amplifier comprises a non-inverting input, an inverting input and an output; a coherent current source coupled to the inverting input; a feedback network coupled to the output; and a capacitance coupled to the inverting input.

Dynamic range enhancement for self-capacitance measurement

An angular detection system including a magnet and sensors is disclosed. The magnet can be located on a rotating component and the sensors can be located on a stationary component, or vice versa. The magnet can generate a plurality of magnetic flux lines. The plurality of sensors can be located and spatially separated along the motion path of the magnet for detecting the magnetic flux densities. The strength of the magnetic flux lines sensed by a given sensor can be used to determine the location of the magnet along its motion path. The plurality of sensors can generate one or more signals indicative of the strength of the sensed magnetic field lines. Based on the strength of the magnetic flux lines, the location of the magnet, or both, the system can determine the angle of rotation of the device by using a polynomial function or a look-up table.

Angle detection of a rotating system using a single magnet and multiple hall sensors

An analog front end circuit utilizes coherent detection within a capacitance measurement application. The analog front end circuit uses coherent detection to measure capacitance of a touch screen display. An analog excitation signal is modulated by a capacitor to be measured. The modulated signal is synchronously demodulated using a correlator, which includes a discrete mixer and a discrete integrator. The excitation signal is also input to the mixer such that the modulated signal is multiplied by the excitation signal. The excitation signal is an analog signal having a sine wave function or other waveform.

Capacitive touch sense architecture having a correlator for demodulating a measured capacitance from an excitation signal

A mixed signal correlator utilizes coherent detection within a capacitance measurement application. In some applications, the mixed signal correlator is used to measure capacitance of a touch screen display. An external capacitor whose capacitance is measured is kept small for improved sensitivity and can be used for a variety of applications having varied integration periods for measurement. The external capacitor is kept small and can be used for varied applications by adjusting the output voltage within a range that is less than the supply voltage, and maintaining a count of the adjustments to later reconstruct an actual output voltage for the integration period. An output is a weighted sum of an analog integrator output and a digital counter output.

Calibration for mixed-signal integrator architecture

An analog front end circuit utilizes coherent detection within a capacitance measurement application. The analog front end circuit uses coherent detection to measure capacitance of a touch screen display. An analog excitation signal is modulated by a capacitor to be measured. The modulated signal is synchronously demodulated using a correlator, which includes an integrated mixing and integration circuit. The correlator includes a programmable impedance element that generates a time-varying conductance according to a controlling digitized waveform.

Continuous time correlator architecture

Mixed-signal integrator architecture

A data sampling apparatus and associated method are provided, including a first inverter receiving a data signal, and inverting the data signal to produce a trigger signal, a first flip-flop receiving the trigger signal, and outputting an output signal, a second flip-flop and a third-flop flop each receiving the output signal from the first flip-flop, the second flip-flop further receiving a strobe signal, and a second inverter inverting the strobe signal, and outputting the inverted strobe signal to the third flip-flop. An output of the second flip-flop indicates a value of the output signal output from the first flip-flop when the strobe signal is of a first state and an output of the third flip-flop indicates a value of the output signal output from the first flip-flop when the strobe signal is of a second state.

Apparatus and method for sampling a data signal in a manner independent of a hold time of the data signal

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San Jose, CA, United States of America

Rajesh Anantharaman