Driver for radio frequency (rf) switched-capacitor power amplifier (scpa)
AssigneeQUALCOMM Incorporated
InventorChi-Fung KWOK
Life of this patent
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Abstract
A signal processing circuit is described. The signal processing circuit includes a power amplifier. The power amplifier is composed of at least a p-type metal oxide semiconductor (PMOS) transistor and an n-type metal oxide semiconductor (NMOS) transistor. The signal processing circuit also includes a driver circuit. The driver circuit includes a first linear voltage regulator having an output coupled to a power supply input of a second linear voltage regulator. The first linear voltage regulator and the second linear voltage regulator are each coupled to the power amplifier.
Claims21
A signal processing circuit, comprising:
- a power amplifier, comprising at least a p-type metal oxide semiconductor (PMOS) transistor and an n-type metal oxide semiconductor (NMOS) transistor;
- and
- a driver circuit comprising a first linear voltage regulator having an output coupled to a power supply input of a second linear voltage regulator, the first linear voltage regulator and the second linear voltage regulator both coupled to the power amplifier.
A method of sharing charge in a signal processing circuit, comprising:
- discharging a current from a gate of a p-type metal oxide semiconductor (PMOS) switching device of a digital power amplifier through a driver network coupled to the digital power amplifier;
- and
- charging a gate of an n-type metal oxide semiconductor (NMOS) switching device of the digital power amplifier using the current discharged from the PMOS switching device.
A signal processing circuit, comprising:
- a differential digital power amplifier comprising at least a p-type metal oxide semiconductor (PMOS) transistor and an n-type metal oxide semiconductor (NMOS) transistor;
- and
- means for conducting charge from a gate of the PMOS transistor through a linear voltage regulator to a gate of the NMOS transistor.
Dependencies are inferred from the claim text.