Apple Inc.

Marvell International Limited

Anuranjan Jha

David M Signoff

Xiaoyue Wang

Weiwei Xu

Morteza Nick

Alireza Razzaghi

Arvind Anumula Paramanandam

A power amplifier and method for operating the same is disclosed. The amplifier includes a number of transistors coupled in series between a power node and a ground node. These transistors include a first transistor having a source terminal coupled to the power node, and a second transistor having its source terminal coupled to a ground node. A subset of transistors is also coupled in series between the first and second transistors. During operation in a first mode, the first and second transistors act as switching transistors, switching according to data received thereby. The subset of transistors, during the first mode, act as cascode transistors. During a second mode of operation, the transistors of the subset act as switching transistors, switching in accordance with the received data.

High efficiency switching power amplifier

Systems and techniques relating to a digital-to-analog converter (DAC) are described. A described DAC cell includes a differential switch pair coupled with a cross-coupled switch pair. Gate terminals of the differential switch pair are arranged to respectively receive an input signal to the cell and an inverted version of the input signal to respectively drive the gate terminals of the differential switch pair. Gate terminals of the cross-coupled switch pair are arranged to respectively receive the input signal and the inverted version of the input signal to respectively drive the gate terminals of the cross-coupled switch pair. The cross-coupled switch pair is configured to reduce or eliminate net differential transient current between switch output terminals of the differential switch pair. A current-to-voltage converter coupled with the switch output terminals of the differential switch pair generates a voltage that forms at least a portion of an output of the digital-to-analog converter.

Current steering cell with code-dependent nonlinearity cancellation and fast settling for low-power low-area high-speed digital-to-analog converters

Growing community of inventors

San Jose, CA, United States of America

Anuranjan Jha