US 8,618,868 B2 · Single charge-pump buck-boost for providing independent voltages

Abstract

Disclosed is a charge pump having first and second outputs and at least one capacitor. A plurality of switches are coupled to the at least one capacitor for selectively coupling the at least one capacitor between a high voltage node and a low voltage node, and for selectively coupling the at least one capacitor to the first output and the second output. A switch controller is adapted to generate control signals for the plurality of switches to selectively couple the at least one capacitor between the high voltage node and the low voltage node during charging, and to selectively couple the at least one capacitor to the first output and the second output during discharging that output a first voltage pulse from the first output and a second voltage pulse from the second output such that the first voltage pulse and the second voltage pulse are asymmetrical and coincidental.

Claims24

Dependent claims

A charge pump for providing independent voltages, comprising:

a first output;
a second output;
at least one capacitor;
a plurality of switches;
and
a switch controller adapted to generate control signals for the plurality of switches to selectively couple the at least one capacitor between a high voltage node and a low voltage node during charging phases, and to selectively couple the at least one capacitor to the first output and the second output during discharging phases that output a first voltage pulse from the first output and a second voltage pulse from the second output such that the first voltage pulse and the second voltage pulse are asymmetrical and coincidental, and wherein the first voltage pulse and the second voltage pulse each reach a voltage level that is about twice the voltage level between the high voltage node and the low voltage node.

3 more elements

A mobile terminal comprising:

a first power amplifier having a power input terminal;
a second power amplifier having a power input terminal;
a charge pump for providing independent voltages, comprising:
a first output;
a second output;
at least one capacitor;
a plurality of switches;
and
a switch controller adapted to generate control signals for the plurality of switches to selectively couple the at least one capacitor between a high voltage node and a low voltage node during charging phases, and to selectively couple the at least one capacitor to the first output and the second output during discharging phases that output a first voltage pulse from the first output and a second voltage pulse from the second output such that the first voltage pulse and the second voltage pulse are asymmetrical and coincidental, and wherein the first voltage pulse and the second voltage pulse each reach a voltage level that is about twice the voltage level between the high voltage node and the low voltage node.

6 more elements

Dependencies are inferred from the claim text.

Single charge-pump buck-boost for providing independent voltages

Life of this patent

Single charge-pump buck-boost for providing independent voltages

Life of this patent

Abstract

Claims24