Patent ID: 6671330
Filing Date: 2003-12-30
Classification: H03F,H03K

Abstract:
A power amplifier comprising:a switched output stage containing a power bridge circuit formed by a plurality of switch elements and connected to a floating intermediate circuit voltage; a digital pulse width modulator, connected to said switch elements, which generates pulse width modulated control signals for the respective switch elements from digital signals, thereby causing said switched output stage to generate an output stage voltage dependent on an output stage switching clock; and said digital pulse width modulator comprising a counter having an output at which a counter reading is present, and a comparator having a first input for receiving said counter reading, a second input for receiving at least one of said digital input signals, a first output for emitting a binary signal if said counter reading is less than said one of said digital input signals, a second output for a binary signal if said counter reading is greater than said one of said digital input signals, and a control signal generator connected to aid first and second outputs of said comparator for generating said control signals for said switch elements dependent on the respective binary signals at said first and second outputs of said comparator.