Skyworks Solutions, Inc.

Volterra Semiconductor Corporation

Quantance, Inc.

Apple Inc.

Luigi Panseri

Serge Francois Drogi

Florinel G Balteanu

Paul T DiCarlo

Sombuddha Chakraborty

Craig Joseph Christmas

Marcus Charles Mertsching

Anthony J Stratakos

Ilija Jergovic

Andrew J Burstein

Michael D McJimsey

Trey Roessig

Giovanni Garcea

Andrea Pizzutelli

Biljana Beronja

Yali Xiong

Paul H Choi

Theodore Vinko Burmas

Hung Sheng Lin

Hyunwoo Nho

Kingsuk Brahma

Jie Won Ryu

Sun-il Chang

Baris Cagdaser

Junhua Tan

Jesse Aaron Richmond

Injae Hwang

Hyuck-Jae Lee

Toshiaki Sawada

Marcus Mertsching

Embodiments described herein relate to an envelope tracking system that uses a single-bit digital signal to encode an analog envelope tracking control signal, or envelope tracking signal for brevity. In certain embodiments, the envelope tracking system can estimate or measure the amplitude of the baseband signal. The envelope tracking system can further estimate the amplitude of the envelope of the RF signal. The system can convert the amplitude of the envelope signal to a single-bit digital signal, typically at a higher, oversample rate. The single-bit digital signal can be transmitted in, for example, a low-voltage differential signaling (LVDS) format, from a transceiver to an envelope tracker. An analog-to-digital converter (ADC or A/D) can convert the single-bit digital signal back to an analog envelope signal. Moreover, a driver can increase the power of the A/D output envelope signal to produce an envelope-tracking supply voltage for a power amplifier.

Automated envelope tracking system

An electronic device includes a display having a number of pixels, source driving circuitry that drives data to the pixels, and data lines that communicatively couple the source driving circuitry with the pixels. The electronic device also includes quality monitoring and calibration circuitry that identifies degradation in the source driving circuitry, one or more of the data lines, or both. The electronic device may be controlled based at least in part upon identification of the degradation.

Display quality monitoring and calibration

A power supply for a radio frequency (RF) power amplifier that amplifies an RF input signal into an RF output signal and a method of operation in the power supply. The power supply comprises a first power converter to convert an input voltage to the power supply into a first supply voltage of the RF power amplifier. The power supply comprises a second power converter to receive the input voltage and the first supply voltage and to selectively convert either the input voltage or the first supply voltage into at least a portion of a second supply voltage of the RF power amplifier.

System and method for supplying power to a power amplifier

Power supply

A DC-to-DC converter includes a switching circuit, an energy storage inductor electrically coupled to the switching circuit, and a controller. The controller includes a control signal generator, a current sensing subsystem, an over-current detection subsystem, and filter logic. The control signal generator generates unfiltered control signals to control the switching circuit, and the current sensing subsystem senses current flowing through the energy storage inductor. The over-current detection subsystem asserts an over-current signal if a magnitude of positive current flowing through the energy storage inductor exceeds a maximum permissible value. The filter logic filters the unfiltered control signals to generate filtered control signals in response to assertion of the over-current signal, such that respective widths of one or more pulses of the filtered control signals are less than respective widths of corresponding pulses of the unfiltered control signals.

DC-to-DC converter controllers including over-current protection, and associated systems and methods

A regulated, power supply system is described using multiphase DC-DC converters with dynamic fast-turnon, slow-turnoff phase shedding, early phase turn-on, and both load-voltage and drive-transistor feedback to pulsewidth modulators to provide fast response to load transients. In an embodiment, a system master can automatically determine whether all, or only some, slave phase units are fully populated. The programmable system includes fault detection with current and voltage sensing, telemetry capability, and automatic shutdown capability. In an embodiment, these are buck-type converters with or without coupled inductors, however some of the embodiments illustrated include boost configurations.

Systems and methods for DC-to-DC converter control

Growing community of inventors

Pleasanton, CA, United States of America

Luigi Panseri