Power management unit for a wireless device
AssigneeBroadcom Corporation
InventorRosario Pagano
Life of this patent
Estimating the term…
Abstract
A method and apparatus is disclosed to regulate an input voltage to provide a regulated output power. The regulated output power may include a smooth direct current (DC) component and an undesired alternating current (AC) component, the smooth DC component being an average of the regulated output power. A buck regulator module of the present invention regulates the smooth DC component to approximate a reference voltage. The buck regulator module additionally replicates the undesired AC component embedded within the regulated output power. A replicated undesired AC component is combined with the regulated output power to reduce the undesired AC component embedded within the output power.
Claims24
A switching voltage regulator, comprising:
- a switching module configured to provide a charging current in response to a charging control signal;
- a controller module configured to provide the charging control signal based upon a pulse width modulator (PWM) control signal and to replicate the charging current to provide a scaled charging current;
- a filter module configured to provide one or more undesired components based upon the scaled charging current;
- a noise module configured to scale the one or more undesired components to provide one or more replica undesired components;
- a combination module configured to combine the one or more undesired components and the charging current to provide a noise reduced charging current;
- and
- a pulse width modulator (PWM) configured to provide the (PWM) control signal based upon the noise reduced charging current.
A method to regulate an input voltage to provide a regulated output power, comprising:
- (a) switching between the input voltage and a ground in response to a charging control signal, the charging control signal being proportional to a pulse width modulation (PWM) control signal;
- (b) replicating the charging current to provide a scaled charging current;
- (c) separating the scaled charging current into one or more undesired components;
- (d) scaling the one or more undesired components to provide one or more replica undesired components;
- (e) combining the one or more undesired components and the charging current to provide the regulated output power;
- and
- (f) comparing the regulated output power with at least one of a group consisting of a reference power and a reference pulse to provide the PWM control signal.
Dependencies are inferred from the claim text.