Qualcomm Incorporated

Sambanova Systems, Inc.

Sang-Min Lee

Michael Peter Mack

Roger Brockenbrough

Angelica Wong

Paul J Husted

Kai Shi

Anssi Haverinen

Praveen Dua

Richard Chang

Brian James Kaczynski

MeeLan Lee

Jin-uk Shin

Fahim Ur Rahman

Hyunsik Park

Todd Christopher Reynolds

Sotirios Limotyrakis

Joe I Jamp

Tuofu Lu

A clock stretcher includes a digital DLL that derives delayed versions of an input clock signal, and a combiner that cyclically selects the delayed versions to generate a modified clock signal. The combiner uses a hop code, dependent on a sensed condition, to determine the step size for the cyclical selection. The digital DLL corrects its delay speed at discrete times, during which it may be active. If the DLL delay line becomes slower while it is active, the modified clock signal would incur a glitch. The clock stretcher corrects for this glitch by using an increased hop code when a speed change occurs. The clock stretcher may operate from a sensed power supply without intervening voltage regulation.

Variable-length clock stretcher with correction for digital DLL glitches

A method, an apparatus, and a computer program product for inductive communication are provided in connection with providing mechanisms for detecting a remote NFC device without excessive power consumption. In one example, a communications device is equipped to monitor frequency oscillations associated with a NFC antenna using a calibrated LPO, determine that a number of occurrences of the frequency oscillations from a reference frequency is greater than a frequency deviation threshold, and perform a NFC polling procedure in response to the determination.

Methods and apparatus for improving remote NFC device detection using a low power oscillator circuit

A method, an apparatus, and a computer program product for wireless and/or inductive communications are provided in connection with improving remote NFC device detection through use of an oscillator circuit connected to an NFC antenna and matching network. In one example, a communications device is equipped to monitor frequency oscillations generated by an oscillator circuit associated with a transmitter path of a NFC antenna and matching network, determine that a number of occurrences of the frequency oscillations from a reference frequency is greater than a frequency deviation threshold, and perform a NFC polling procedure in response to the determination.

Methods and apparatus for improving remote NFC device detection using an oscillator circuit

A tri-state control mechanism can be implemented for a line driver of a transmitter unit to switch the output impedance of the transmitter unit between a low impedance state in the transmit mode and a high impedance state in the receive mode while minimizing turn-off glitch. It may be determined whether a communication device comprising the transmitter unit is configured in a transmit operating mode or a receive operating mode. If the communication device is configured in the receive operating mode, a first bias voltage can be generated to bias output transistors of the line driver circuit in a sub-threshold state. If the communication device is configured in the transmit operating mode, a second bias voltage can be generated to bias output transistors of the line driver circuit in a saturation state.

Tri-state control for a line driver

A hybrid SAR ADC can be implemented to reduce the number of operations that are executed to convert an analog input signal into its digital representation. Pipeline processing operations can be executed on the analog input signal to generate pipeline bits (MSBs of the digital representation) and an analog residue signal. The analog residue signal can be compared against a plurality of thresholds to generate comparator bits that are indicative of a range associated with a subset of the predetermined thresholds that correspond to the analog residue signal. Successive approximation analog-to-digital conversion operations can be executed on the analog residue signal to generate successive approximation bits. The digital representation can be determined based, at least in part, on the pipeline bits, the comparator bits, and the successive approximation bits.

Hybrid successive approximation analog-to-digital converter

This disclosure is directed to systems and methods that provide control of transmitted signal power that do not require the use of an external power detector. By determining the expected transmit power based upon conditions such as temperature or voltage, the settings of the transmitters amplifier can be adjusted to more closely match the desired transmit power.

System and method for providing open loop transmit power control

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Palo Alto, CA, United States of America

Sang-Min Lee