Intel Corporation

Apple Inc.

Yifan Wang

Stephan Henzler

Andreas Menkhoff

Alexander Belitzer

Wolfgang Walthes

Thomas Eichler

Holger Wenske

David Herbison

Tobias Werth

Emil Neborovski

Thomas Piorek

An envelope tracking system for controlling a power amplifier supply voltage includes envelope circuitry and a feed forward digital to analog converter (DAC) circuitry. The envelope circuitry is configured to generate a target envelope signal based on a selected power amplifier supply voltage. The feed forward DAC circuitry includes a voltage source circuitry and a selector circuitry. The voltage source circuitry is configured to generate a plurality of voltages. The selector circuitry is configured to select one of the plurality of voltages based at least on the target envelope signal. The feed forward DAC circuitry is configured to provide the selected voltage to a supply voltage input of a power amplifier that amplifies a radio frequency (RF) transmit signal.

Feed-forward envelope tracking

Systems, methods, and circuitries for regulating voltage supplied to a power amplifier are disclosed. In one example, a buck-boost control system is configured to control a buck-boost converter to operate in either a buck mode or a boost mode. The system includes compensator circuitry configured to determine a target current based on a difference between a target voltage and a regulated output voltage of the buck-boost converter and determine a tolerance current that, with the target current, defines a range of expected coil current for the present operating mode. Based on the difference between the target voltage and the regulated output voltage, a charge control signal or a discharge control signal is generated for the converter to cause the coil current to approach the target current. Mode control circuitry is configured to switch the buck-boost converter to the other operating mode when the coil current reaches the tolerance current.

Voltage regulator control systems and methods

Growing community of inventors

Groebenzell, Germany

Yifan Wang